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Ohm rating for 8" Kustom CTS speakers [message #28334] Fri, 01 October 2021 17:26 Go to next message
Lone_Poor_Boy is currently offline  Lone_Poor_Boy
Messages: 2
Registered: October 2021
Junior Member
I just got a 70's or 80's 4x8" Kustom speaker setup and I am trying to determine the ohm rating of each speaker.

'CTS' is on the back of the speaker cab
On square magnet: 5808322 6910 137

Thanks
Re: Ohm rating for 8" Kustom CTS speakers [message #28335 is a reply to message #28334] Sat, 02 October 2021 08:04 Go to previous messageGo to next message
stevem is currently offline  stevem
Messages: 4733
Registered: June 2004
Location: NY
Senior Member
In terms of the vintage Kustoms that we deal with here ( before 1980) Kustom never made a cabinet with four 8" speakers .
The speakers themselves would only be 8 ohms or 16 ohms in impedance.
You need to prove this out with a ohm meter test .
When using a ohm meter the reading you get will always be less then the impedance that the speaker is.
For instance a 8 ohm driver will resistance check at between 6.8 and 7.5 ohms on the meter.

If your just looking to find out the overall impeadance of the cabinet hook the ohm meter up across the input jack.
Re: Ohm rating for 8" Kustom CTS speakers [message #28336 is a reply to message #28334] Mon, 04 October 2021 08:34 Go to previous messageGo to next message
carlc is currently offline  carlc
Messages: 143
Registered: July 2006
Location: Summerville, SC
Senior Member
Kustom did make PA columns with four 8" speakers. They were 40 inches tall.
Re: Ohm rating for 8" Kustom CTS speakers [message #28337 is a reply to message #28334] Mon, 04 October 2021 18:11 Go to previous messageGo to next message
Lone_Poor_Boy is currently offline  Lone_Poor_Boy
Messages: 2
Registered: October 2021
Junior Member
Thanks to both of you. This must be early 1980's and is a 40" tall Kustom with 4 - 8" speakers. Black classic padded upholstery look.

I tested the speakers after getting a multimeter and reading a bit and 3 came in at 6 and one at OL, so that one is bad. I wired out the bad one and have been playing through it, using an amp head that is right for the 3 speakers wired ohm rating.

I can't link a pic until I've made 10 posts, apparently.
Re: Ohm rating for 8" Kustom CTS speakers [message #28338 is a reply to message #28334] Mon, 04 October 2021 20:14 Go to previous message
stevem is currently offline  stevem
Messages: 4733
Registered: June 2004
Location: NY
Senior Member
Seeing that you have now posted that it's covered up. Tuck & roll and that the speaker code you posted date them to the 10th week of 1969. Congrats on your vintage Kustom find!

The overall cabinet impeadance would be 8 ohms.
Please note though that pictures can not be posted here, your best bet is the Kustom Facebook site for that.
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