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2 ohms or not 2 ohms that is my question!!! [message #1443] Fri, 19 April 2002 02:31 Anonymous I have a Kustom 200 bass head and a d140 cab and a CTS cab. Now I am contemplating putting some Carvin PS15's in at least one of the cabs. The D140 has two 15" JB Lansings subs. The CTS has only one sub I'm assuming Jb Lansing, I haven't taken a peek yet.(the previous owner evidently took out the other sub.) Now if by chance I were to replace the speakers in the two cabs with four new 8ohm speakers I would be running it at 2 ohms. I would like your guys opinion on whether or not you think the amp can handle a 2 ohm. I'm just curious. Please any info would be greatly appreciated. Thanks! Report message to a moderator

Re: 2 ohms or not 2 ohms that is my question!!! [message #1508 is a reply to message #1443] Wed, 15 May 2002 07:57 Anonymous The amp will not handle 2 ohms for long depending how loud it is played. the 3-15" cabs where 2.7 ohms and that was cutting it close. The thing to remmeber with impedence is that the lower the tone put in the speaker the impedence goes down from its starting point, as the freq goes up the oposite happens. Report message to a moderator

Re: 2 ohms or not 2 ohms that is my question!!! [message #1511 is a reply to message #1508] Wed, 15 May 2002 13:35 C4ster Messages: 686 Registered: June 2001 Location: Mukwonago, WI (Milwaukee... Senior Member Actually, the 3x15 were all 16 ohm speakers I believe. That would be a cab impedance of 5.3 ohms, well above the 4 ohm minimum. Check out the post, how old is my K200. I addressed the same question up there. Conrad Report message to a moderator

Re: 2 ohms or not 2 ohms that is my question!!! [message #1518 is a reply to message #1511] Thu, 16 May 2002 17:03 Anonymous I agree with C4ster, the 3x15 cabinets were indeed 5.3 th 5.6 ohms. This is taken from the Kustom service manual. It could be the cabinet with the lower impedance, could have had a speaker change over the last 30+ years. Bottom line is 4ohms is what kustoms like. It always better to go above than below with impedances. A 2 ohm load is almost like putting a nail in the speaker jack. The newer amps boast two ohm loads, but most in fine print will raise the THD distortion factor to make up the difference. There is a lot hocus pocus, rating amps today. Input gain, freqs, outputs at different impedances, THD factors. It is still a buyer beware market. Report message to a moderator

Re: 2 ohms or not 2 ohms that is my question!!! [message #1522 is a reply to message #1518] Fri, 17 May 2002 08:57 C4ster Messages: 686 Registered: June 2001 Location: Mukwonago, WI (Milwaukee... Senior Member I have a Sunn SA21 power amp that is rated at 300 watts into 2 ohms per channel. This amp will run all night at 2 ohms, sound great and not even raise the temperature on the amp. Mackie and Crown are very repectable amps that will run into 2 ohms and not skip a beat. Kustom is much older and if you try to run into anything less than 4 ohms, the amp really gets funky. I bought a cabinet that has 4 ohm speakers that were originally wired in parallel to match a Peavey amp. When I connected it to a K200-B1 the amp sounded horrible. I rewired the speakers in series for 8 ohms and the rig sounds great on bass. The power output is less than 100 watts, closer to 75 but more than I need as I lne direct in to the sound board and use the PA to increse the sound levels. In early June, my son will be setting up the ultimate bass rig for a battle of the bands in our town. He will be running a K200 into 2 3x15's with the Sunn amp as a slave for the second cab. He can't wait. Report message to a moderator

ohms and watts for CTS speakers [message #1633 is a reply to message #1443] Wed, 19 June 2002 11:14 Anonymous I've been following some of the speaker discussions, and am wondering about ohms and wattage of mine. I have a pair of 3 @ 15" cabs. #137 6907 is the number on the speakers, I understand that would be CTS made in the 7th week of 1969. I think my speakers are 12 ohm, and am guessing that means each cab is 4 ohm? Does that mean when pushing both I am at 2 ohm- that doesn't sound right! I also have a 380 GK Combo that says at the speaker jack "one or two 8 ohm cabinets or one 4 ohm cabinet." Is there a way to run one of my Kustom cabs with this head in addition to the two tens in the combo? thanks so much, Mike. BTW, if interested, I can share any of the photos that are up at: http://members.aol.com/rapterrex8/Instruments.html Report message to a moderator

Re: ohms and watts for CTS speakers [message #1634 is a reply to message #1633] Wed, 19 June 2002 15:02 Anonymous Just found out my GK combo's internal speaker load is 8 ohm; so I can run one more 8 ohm cab with that, or a 4 ohm cab without. I still would like to know if it is possible to verify if my CTSs are really 12 ohm or no ... thanks, Mike Report message to a moderator

Re: ohms and watts for CTS speakers [message #1638 is a reply to message #1634] Wed, 19 June 2002 22:45 KustomBlues Messages: 490 Registered: June 2001 Location: Michigan Senior Member Do you have a digital meter? Report message to a moderator

Re: ohms and watts for CTS speakers [message #1640 is a reply to message #1638] Thu, 20 June 2002 10:46 Anonymous Sorry, Deb- I do have a light meter for the camera, but no digital meter for the Kustom :-( (I've afraid I'm a Neanderthal compared to you folks.) If I were to go buy one, how would I use it to determine the ohms and wattage? Someone mentioned in another post the guy in CCR is running 4 Sunn 2 x 15 cabs with this same head (the K400B-1 has 4 speaker out jacks)- wondering if there might be a clue there about the intended load for this rig? thanks again, Mike Report message to a moderator

Re: ohms and watts for CTS speakers [message #1641 is a reply to message #1640] Thu, 20 June 2002 11:03 Anonymous Here's the quote, posted by ET 5/16: << CCR playing his 400 kustom head into 4 of the big Sunn 2x15 colesium cabs..now the back of the 400 has a pair of speaker jacks on each side which on that rig is a separate amp even though it runs off the same single power tranny... Don was explaining to me that, I think, with each of those cabs at 8 ohms you'd be running a 4 ohm load per side to get the max 100watts per side out of that amp for the technical 200 wattrms rating thus the 400 on the front panel >> This would seem to confirm my thought that my 3x15 cabs are 4 ohm, but if I follow this reasoning, my 400 head is not really pushing a 2 ohm load, but two separate 200 heads are pushing 4 ohm loads? How many mistakes does one get on this forum before being asked to leave? ;-) Mike Report message to a moderator

Re: ohms and watts for CTS speakers [message #1642 is a reply to message #1641] Thu, 20 June 2002 11:43 C4ster Messages: 686 Registered: June 2001 Location: Mukwonago, WI (Milwaukee... Senior Member Mike, Actually, the 3x15 cabinets are running 16 ohm speakers in parallel for a resulting impedance of 5.3 ohms. Kustom amps were designed for a minimum load of 4 ohms, therefore the 5.3 is OK. You are correct in that the 400 head is actually 2 200 power amps in one cabinet. I'm not sure of your amp, but some 400's had a stereo/mono switch on the front under the pilot light. Then the left side inputs would go to the left power amp and the right to the right amp. The actual full power output into the 5.3 ohms is actually a little less than 100 watts per side, but not enough to really matter. Now, if you had a digital multimeter, or even an analog one, if you measured the resistance at the speaker jack of the cabinet, not connected to the amp, you would read a little less than the rated impedance value of the speakers. For example, JBL publishes the actual resistance of an E120-16 as 13 ohms, an E120-8 as 6.3 ohms, and so on. But you get the idea. By the way, you have a VERY impressive bass collection. I usually assume that we are all rockers on this site and the appearance of a philharmonic maestro leaves me humbled. Conrad Report message to a moderator

Re: ohms and watts for CTS speakers [message #1643 is a reply to message #1642] Thu, 20 June 2002 12:31 Anonymous << I usually assume that we are all rockers on this site and the appearance of a philharmonic maestro leaves me humbled. Conrad >> Hey, I'm still a rocker! And the collective knowledge of this group leaves ME humbled! My plans are to sell this rig, but seeing the enthusiasm here is making me have second thoughts. I'm going to study your post awhile, then run out and look for a digital multimeter- I'll let you know what I find. Thanks a WHOLE bunch again! Mike Report message to a moderator

Re: ohms and watts for CTS speakers [message #1644 is a reply to message #1643] Thu, 20 June 2002 12:58 C4ster Messages: 686 Registered: June 2001 Location: Mukwonago, WI (Milwaukee... Senior Member Mike, I just picked up a pair of 3x15 PA columns with horns and I put new speakers in them. The 3x15's are relatively rare. I am still kicking myself and my kids are kickcing me also, and my wife, for selling what I originally had. Now I am in the process of buying up new(old)rigs for myself and the boys. I know those cabinets are monsters, but there is nothing out there to match them. Don't sell!!!!!!!!!!!!! Conrad Report message to a moderator

Re: 2 ohms or not 2 ohms that is my question!!! [message #1646 is a reply to message #1443] Thu, 20 June 2002 16:45 BC Messages: 583 Registered: March 2000 Location: Kentucky Senior Member Hey Mike....Like i said..you just need to get a pair of 2x15 and a pair 0f 1x15 cabinets and load them with your favorite speakers and you will have the ability to play any size place....and you won't always have to move the big boys. I let my original Kustom amp get away from me many years ago.....and I would trade a bunch of amps just to get it back now!BC Report message to a moderator

Re: ohms and watts for CTS speakers [message #1647 is a reply to message #1642] Thu, 20 June 2002 17:10 Anonymous OK, I went to Radio Shack and bought a digital multimeter to check the 3x15 cabs. One read 4.3 ohms, the other 4.0 ohms. From what everyone has said, I suppose this means the speakers are indeed 16 ohm and not 12 ohm, because a cab with three speakers at 12 ohm should read a bit less than 4 ohms, right? Also, both of my GKs push a 4 ohm load, one at 200W and the other at 380W. Someone said at full 4 ohm capacity the Kustom 400 head is pushing each cab at 100W. Can I assume these cabs should NOT be run on either of my GK amps, then? Mike Report message to a moderator

Re: ohms and watts for CTS speakers [message #1650 is a reply to message #1647] Fri, 21 June 2002 07:52 Anonymous you can run only one of your kustom cabs on a GK, two would be less than a 4 ohm load, unless you made up a series spker cable. Than you could run both kustoms on a GK, but their wattage out put would be half of its 4 ohm rated output. Report message to a moderator

Thanks [message #1651 is a reply to message #1650] Fri, 21 June 2002 11:30 Anonymous Thanks, everyone :-) -Mike Report message to a moderator

Re: Thanks [message #1652 is a reply to message #1651] Fri, 21 June 2002 15:45 ET Messages: 146 Registered: October 2000 Location: Charlotte NC Senior Member for the record...this boy never did sell...still have my first kustom from my 13th birthday/christmas present 1969 with cover...mint condition and it has lasted me the lifetime that Bud promised it would..its been on airplanes, in the belly of tour buses, and been asked to push ohm loads that I've never identified from days when I didn't even know how to spell ohm! (is that correct?)I also have my pair of 2x15 bass cabs and 200 head from age 16 and their covers and life has been the same with them...still in service after all this time. I still struggle with the 400 heads but if I understand Don correctly, each power amp side will put out 100 watts rms at the full 4 ohm load for a total of 200watts rms potential from the amp. which I guess is what you would have had if you ran the catalog rig which was 4 of the 3x15 PA cabs? Report message to a moderator

Re: Thanks [message #1654 is a reply to message #1652] Fri, 21 June 2002 17:45 Anonymous ET wrote: << I still struggle with the 400 heads ... each power amp side will put out 100 watts rms at the full 4 ohm load for a total of 200watts rms potential from the amp ... what you would have had if you ran the catalog rig which was 4 of the 3x15 PA cabs? >> Did you mean to say "2 of the 3x15 cabs"? (Each of my 3x15 cabs is more or less 4 ohms.) Know with the set-up each cab is pulling 100W; wish I knew if they could safely handle 200W, or even 380W. Somewhere in the forum is a comment by Don, I think, about in the old days speakers rated by magnet weight instead of watts. -Mike Report message to a moderator

Re: Thanks [message #1656 is a reply to message #1654] Sat, 22 June 2002 01:32 Anonymous Very interesting reading on the 400 amps. The 400 amp was in reality two of the K200 power amps using a common power supply and had two speaker outs per side. Each amp ran at 100 watts RMS into a 4 ohm load. Both the PA version and the guitar/bass were the same power sections. In answer to Mikes question the cabinets will handle well over the 100 watt that each amp in the 400 head produced. As far as the 380 watts, I see no reason one of the cabinets couldn't handle it. Common sense is still the key. I've replaced JBL K120 speakers for customers who blew them out with a 45 watt amp. To little power cranked is as damaging as to much. Back in the 60's a lot of amp and speaker companys rated the amps with the number of tubes and speakers by magnet weight. I would experiment with a 3x15 cabinet and a maybe a 2x10 or 4x10 cabinet with your GK head. It won't look as good as the 400 head and two of the 3x15 cabinets but sound is a personal thing. I used to run the 400 head with a 6x15 JBL's and the bass player ran the same rig with CTS, and the other guitar player ran a 3x15 K200 along with the 1295 KUstom organ, and the K200 PA head with the siren 3x15 cabinets. All in black and had a wall of sound. Don Report message to a moderator

wattage for 3x15 cabs [message #1657 is a reply to message #1656] Sat, 22 June 2002 10:49 Anonymous Wow! I see why I've come across all those old posts praising Don! Thanks for all that info! Just for the record, I plan to keep the 2 CTS 3x15 cabs with the Kustom 400 head generally. This rig sounds every bit as good with my electric bass as my newer Gallien-Kruegers- and LOUDER!!!- even though as Don explained it's only 100W plus 100W! But for my other rig, I have my GK400 slaved to the GK700 (both are running at 8 ohms). This rig sounds better than the Kustom when using the bow on my double bass (with a Fishman pick-up and pre-amp). I plan to add my 8 ohm Ampeg SVT 15 onto the GK700 to bring that to 4 ohms, then slave to it the GK400 pushing one of the Kustom 3x15s, just for fun. (we all deal with male menopause differently, right?) The GK400 amp is rated for 200W at 4ohms, so that was my worry with the CTS cab. Mucho thanks to Don and the group for helping me figger all this out! BTW- I have the new Radio Shack #274-416(A) knobs on now. They are slightly larger than the originals, but look nice- I could take some pictures with the macro lens if anyone is curious- Mike Report message to a moderator

Re: Thanks [message #1658 is a reply to message #1654] Tue, 25 June 2002 09:11 ET Messages: 146 Registered: October 2000 Location: Charlotte NC Senior Member check out our lit section and look in the 400 PA rig cat and you'll see a big white (silver) PA offered with 4 (Four) of the 3x15 siren cabs and a single 400 PA head.. I didn't see any reference to any of the cabs being powered so I have to assume that Kustom meant for that amp to be able to run all 4 of the cabs...and since the amp has 4 speaker out jacks on the back, again I figured...plug em in...I agree, the math doesn't work and I can't imagine running those amps down to 2 ohms which I guess is what we'd be doing unless maybe the wireing on those output jacks somehow goes series (or is it parrellel?) so the ohm load would not be perceived below 4... I"m stupid , I admit it...and since I only have a pair of the 3x15s I'll likely never know.. I had originally wanted to understand the 400 since I am running a pair of 2x15 bass cabs off of the amp and wanted to get as much out of it as possible for my low end. At this point my plans are to load a stereo speaker jack, or else a second jack in the back of my 2x15s, run higher grade bass speakers in there and power each of the speakers off of a side of the 400 so I get the max rms from one amp into a single cab. Then I'll take a second 400 amp and do the same to my other 2x15 cab. My 3rd 400 head is the stereo unit and I'll run that one into my pair of sirens...that oughta give me some degree of PA... I know...just buy a couple Crowns an be done with it...but I own the 400s, and love my kustoms so whats a boy to do?..Play Loud! ET Report message to a moderator

ET's some degree of PA [message #1659 is a reply to message #1658] Tue, 25 June 2002 11:43 Anonymous Wow, that is some configuration; but I think I can easily top you for stupid! Do I understand you to mean the three 400s will be run together as one PA? How do you do that? On my GKs, I have an effects loop, so the "send" of my GK700 goes into the "return" of my GK400. I'd love to slave my Kustom 400 onto that, too, but don't really know how to do it. Mike Report message to a moderator

Re: ET's some degree of PA [message #1660 is a reply to message #1659] Tue, 25 June 2002 13:05 C4ster Messages: 686 Registered: June 2001 Location: Mukwonago, WI (Milwaukee... Senior Member OK, it's time to straighten out a few things. (The word "ALL" is not to be taken as 100%) All Kustom 200 amps were rated at 100 watts into 4 ohms. All the speakers in Kustom Kabinets were 16 ohms. There, the groundwork has been laid. If you have a 2x15 cabinet, the resulting impedance would be 8 ohms as the speakers are in parallel. If you have 1 cab, the power output would be closer to 60 watts as the internal voltage of the amp tends to be higher with the higher impedance load. If you have 2 2x15 cabs and both are connected, the total load is 4 ohms and the power output would be 100 watts. If you have a 3x15 cabinet, NOT HORNS, the resulting impedance is 5.3 ohms and only 1 cab could be used. That is what the catalog shows for the guitar/bass sections. Now comes the hook. The 3x15 PA or more correctly 2J+1H cabs, that would be 2 15" Jensens and 1 horn would be 2 16 ohm speakers in parallel for a total of 8 ohms. The horns were fed with a crossover capacitor, and the frequency that the horns would start to operate was probibly slightly higher than 1,000 to 2,500 hertz. By this time the impedance of the speakers would start to rise and they would automatically be producing less than the power at lower frequencies. This would mean that the resulting cabinet impedance would be rather constant or rise as the frequencies got higher. Because the lowest impedance of 1 cabinet was 8 ohms, 2 cabinets could be run with a K200 head. Whew!!! Are you with me so far? Now as far as a 400 is concerned, there are 2 200 power units inside and each can be run with the same combinations as I stated for a 200. That means a 400 can power 2 2x15, 4 2x15, 2 3x15 or 4 3x15 with horns. That is a lot to absorb but read everything carefully and it will make sense. Good Luck. Conrad Report message to a moderator

4 ohm 15" speaker [message #1662 is a reply to message #1658] Wed, 26 June 2002 11:04 Anonymous ET wrote: << my plans are to load a stereo speaker jack in the back of my 2x15s, run higher grade bass speakers in there and power each of the speakers off of a side of the 400 >> What 4 ohm speakers do you plan to put in the 2x15 cabs? I couldn't find anything on JBL's D140s that everyone seems to be talking about (noticed someone is selling a pair on Ebay), but I read up on the E140 at: http://www.jblpro.com/pages/pub/components/eseries.pdf They are 8 ohm 400W 15" Bass Speakers, so it would take both in your 2x15 cab to give you the 4 ohms you want, which would still leave you with two cabs per 400 head. Are the D140s also 8 ohm speakers? What do folks like to use for a 4 ohm 15" speaker? Mike Report message to a moderator

Re: ET's some degree of PA [message #1663 is a reply to message #1660] Wed, 26 June 2002 11:40 Anonymous Close... real close. The overall impedance would actually drop at higher frequencies since the crossover cap would reduce in impedance. The impedance of the combination would increase at lower frequencies, but the cap wouldn't completely swamp out the additional impedance of the horn. It's not really as simple as calculated impedance, and you can run a K200 power amp at less than 4 ohms. There is another aspect called "power factor" - the degree or duration of the amp operating at full output power. Too high a power factor and the output transistors can heat up and burn out. A power factor Lower than too high, allows the output transistors time to cool off. A P.A. used for vocals, would be operating at a low power factor - you would want to keep it clean, and the nature of singing itself wouldn't represent any sort of continuous sustained load on the amp - no where like a screaming full volume distorted guitar solo. Report message to a moderator

Re: ET's some degree of PA [message #1664 is a reply to message #1663] Wed, 26 June 2002 12:04 C4ster Messages: 686 Registered: June 2001 Location: Mukwonago, WI (Milwaukee... Senior Member Yes and No. Because the horns are 16 ohms, they represent a smaller load to the amp than the 8 ohm 15" combination. And because higher frequencies affect the overall impedance of the 15's, that is XL=2piFL (I can't type subscripts or characters), that in combination with the resistance of the windings themselves, the impedance WILL go up. Now couple that to a horn crossed over with a capacitor and as the frequencies get higher, the Xc of the capacitor goes down more power is delivered to the horn and less power goes to the speakers, the result is that the impedance of the system may actually go up slightly. You see I am hedging my response by using words such as MAY!! I just know that I used a K200B1 with a cab wired for 2 ohms and it went crazy. Every post I have seen indicates that Kustom A and B series amps were designed for 4 ohms. That they could run under 4 is very likely, but not as low as 2 ohms. and if the PA cab versions didn't work as I have explained the resulting impedance would have been around 2.6 ohms and I would argue that the power amp would have become very unstable. One more item to discuss. Power factor is the phase relationship of voltage to current in an AC circuit. I think you meant duty cycle. That is the ratio of on time to off time in any system. Amplifiers are no exception. The harder you drive them, the more time they need to cool down. Driving an amp into distortion is a lot harder on them than clean signals. Conrad Report message to a moderator

Re: ET's some degree of PA [message #1665 is a reply to message #1664] Wed, 26 June 2002 15:35 C4ster Messages: 686 Registered: June 2001 Location: Mukwonago, WI (Milwaukee... Senior Member Because I am tenacious, and annoying, I just had to check out my theory on the impedance of speakers. Just some basic facts from the JBL website on the E series speakers. Using the E140 as a point of reference, I found the published resistance to be 5.5 ohms for an 8 ohm speaker and 1.1 mH inductance. Calculating the resulting impedance from those values at 32 Hz and 2500 Hz the results yielded 5.5 ohms at 32 Hz and 18.13 ohms at 2500 Hz. That means the 2 speakers in the 3x15 cabinets when hooked in parallel would be 9 ohms at 2500 Hz. And if the capacitive reactance is low enough at that frequency, the resulting cabinet impedance would be 5.76 ohms. Whew!! I'm lucky that worked out. If it didn't I would have drifted into obscurity never to be heard from again. Conrad Report message to a moderator

Re: ET's some degree of PA [message #1666 is a reply to message #1664] Wed, 26 June 2002 17:38 ET Messages: 146 Registered: October 2000 Location: Charlotte NC Senior Member Wow!....really WOW! you guys are some kind of impressive...to an earlier question...I"m just an ol stupy and here's what I do..and have done for many years in one form or another. My small club pa system uses a PV 8 channel mixer(unpowered). I send a mono left channel out as my main to a 32 band eq and then to a power amp which runs my 3x15s full range. I send the other main channel out to a seperate amp which is actually a PV 150watt 5 channel PA head with onboard 5 band graphics...this runs my stage monitors. I send the monitor aux main out to yet a third amp which has in front of it a Bass eq. oh and I forgot, on top of the 3x15 sirens I also have a pair of PV22T horns loaded in some old 200 kustom head housings with their own crossover...depending on the gig, I'll run them off my main amp, or add a try amp situation. So if all this is totally confused imagine my mix console into a 3 way crossover splitting to mains full, high horns, and subs. the amps themselves never touch each other.. I know..the whole thing sucks big time..but its a prime example of what happens when an old guitar player decides to run his own midi band with his wife and a sax player..I took what I had..plugged it all up best I could and for the past 17 years I've not fried a thing and it actually sounds pretty doggone good. In fact I've used an old Boss bass eq pedal and coil chokes for lack of a good electronic crossover and also run this same setup in smaller venues using my 4x8 columns instead of the big 3x15s..and for outdoors I've been known to add a signal to a pair of Krossroads 2x10horn bass combos on each side in the stack to add more mid bass punch at 200watts rms each..somehow I've lived through it all..thanks so much for the ohms lesson guys..you've all been more than great.. I now seek your forgiveness for so completely violating my gear in my ignorance. Play Loud! ET Report message to a moderator

Re: ET's some degree of PA [message #1667 is a reply to message #1666] Wed, 26 June 2002 18:47 C4ster Messages: 686 Registered: June 2001 Location: Mukwonago, WI (Milwaukee... Senior Member Sorry, I get carried away sometimes. I guess I like to argue. I also have a pair of Cascade PA's with sirens and I loaded them with JBL E140's and All I can say is WOW. I ran them full range last night powered by a Sunn SA21 amp at 300 watts in the living room for the boys band practice. I had the bass drum, bass guitar, lead guitar and vocals all in and the sound was tremendous. The Kustom JBL combination is really sweet. I just need more power!!! Uh Uh Uh. (I don't know how to type a Tim Taylor grunt.) My next project is to reload E120's into 2 4x12 columns. I must be nuts. Report message to a moderator

Re: 4 ohm 15" speaker [message #1668 is a reply to message #1662] Wed, 26 June 2002 20:34 KustomBlues Messages: 490 Registered: June 2001 Location: Michigan Senior Member The only 4 ohm 15" speaker I would use is a $100.00 Carvin PS15C-4 cast frame 600 watts: http://www.carvin.com/cgi-bin/Isearch.exe?CFG=2&P2=PS15C-4&P1=RSPK Deb :-) Report message to a moderator

Re: 4 ohm 15" speaker [message #1670 is a reply to message #1668] Thu, 27 June 2002 01:10 Anonymous Thanks, Deb! I bookmarked that page- with two of those, I could follow Brad's suggestion of using the 400 head and leaving the 3x15 cabs at home! -Mike Deb wrote: << The only 4 ohm 15" speaker I would use is a Carvin PS15C-4 >> Report message to a moderator

Re: ET's some degree of PA [message #1671 is a reply to message #1667] Thu, 27 June 2002 10:34 ET Messages: 146 Registered: October 2000 Location: Charlotte NC Senior Member uh huh...see....they do sound good...actually the siren cabs can be pretty blairy in smaller situations.. I have to run my eq in a major reverse bell curve, scooping the snot out of the mids...but I"ve had em in larger venues..clubs where I was serving 300-500 and also outdoors where I could really crank the system.. I was impressed. I'm working right now to tighten up my bass cabs...looking at the Eminence pro series...the 'Delta' which is rated at 300rms... I know I don't really have the power in my kustom 400 to push a 2x15 cab with those speakers to get the real punchy sound, but I'm going to try those first and then if I need to I'll go out and spring for a Crown power amp...its just that I own the kustom gear and I'm too cheap to dump a lot of money into my small PA...when I do bigger jobs there's always a sound company on hand so I don't have to worry with it...I've got my 25th wedding anniversary in August..after that I"m back to spending money on my toys, so I'll do some PA upgrading then and try to watch my ohmage...you guys are the greatest...thanks for all the education..ET Report message to a moderator

Re: ET's some degree of PA [message #1672 is a reply to message #1665] Thu, 27 June 2002 10:51 Anonymous Hey! Some of my best friends are annoying!! You are correct... and I was thinking duty cycle, not power factor. Sometimes those two brain cells just don't connect right! Report message to a moderator

Re: ET's some degree of PA [message #1673 is a reply to message #1671] Thu, 27 June 2002 13:20 C4ster Messages: 686 Registered: June 2001 Location: Mukwonago, WI (Milwaukee... Senior Member Eventually I will split the 15's from the horns and run a 3 way system with the 4 15's as the subs, then cross into the 4x12 columns and then into the horns. I am not a real high frequency lover so I will be running very bottom heavy as it is. Also, this is said quietly under my breath, there isn't enough Kustom power out there to do what I want, so a standard board, rack and power amp will be used. I don't think Bud would mind. I figure I need about 800 to 1000 watts per sub column and 1400 to 1600 for the 12's and maybe 200 or so for the horns. That should wake the neighbors. Report message to a moderator

Re: 4 ohm 15" speaker [message #1674 is a reply to message #1670] Thu, 27 June 2002 20:47 KustomBlues Messages: 490 Registered: June 2001 Location: Michigan Senior Member You are welcome Mike! :-) Report message to a moderator

Re: ET's some degree of PA [message #1675 is a reply to message #1673] Fri, 28 June 2002 11:22 ET Messages: 146 Registered: October 2000 Location: Charlotte NC Senior Member gotta agree.. I've been looking at the Crown 1100s, one for the mains, one for the subs to start and see how much diff that makes. I just don't use this gear on stage that much anymore and so I"m being careful not to spend too much, Imean a new Crown amp might sound better, but it represents another kustom that I could buy with that money..! Report message to a moderator

Re: 2 ohms or not 2 ohms that is my question!!! [message #2794 is a reply to message #1646] Thu, 05 June 2003 05:09 QModer Messages: 413 Registered: June 2003 Senior Member Is a Kustom four hundred a real 400 putting out least 200 watts RMS? I one friend who said it the 400 was no better than a 200 on because each of the two channell's of the 200 realy make it a 100 watt amp. 100 channel. The four hundred he told me has four channels so its still 100 watts a channel. Don't these things have a switch to monural or stereo to them if they do make 200 watts are yours to use instead. If That really true I need a 400 Basshead in either the white/silver pattern or a blue cascade one. Anyone wanna sell such a thing or trade for at 200 head with boot. Of this 400 is running right it would create 200 watts not 100 right. I appreciate your answers to teach me these things. Report message to a moderator

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