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Frank power amp impedance, organ speakers [message #26925]

Sat, 25 August 2018 14:17

rodak
Messages: 516
Registered: October 2001
Location: Georgia

Senior Member

I understand that most (all?) of the Kombo I organs used the older Frank power amps - correct? What is the lowest impedance those amps can take? I ask because a friend just bought a J1295 organ, thinking of replacing the speakers, and wondering whether to get 16 ohm speaker or 8 phms. Presumably, they'd be wired all in parallel. I have the L1595 model, and honestly, I don't recall whether the speakers are 8 ohm or 16 ohm.

www.combo-organ.com

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Re: Frank power amp impedance, organ speakers [message #26926 is a reply to message #26925]

Sat, 25 August 2018 21:27

pleat
Messages: 1454
Registered: June 2004
Location: Belding, Mi

Senior Member

I would suggest that 8 ohm speakers be used and wired in series parallel for a 8 ohm load to the amp since it does have a extension speaker output jack. With the Kombo 1 organ, you will want to add a monitor speaker behind the organ to judge how loud the front of the organ is being played at. We used the Kombo 1 organ in our band back in the 60's and without a speaker behind the organist, he would be blasting way to loud.
pleat

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Re: Frank power amp impedance, organ speakers [message #26927 is a reply to message #26925]

Sun, 26 August 2018 16:03

rodak
Messages: 516
Registered: October 2001
Location: Georgia

Senior Member

Thanks, so the Frank power amp can handle a 4 ohm load?

So I'm guessing the L1595 had 16 ohm speakers, and the J1295 probably had 8 ohm speakers - does that sound right?

www.combo-organ.com

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Re: Frank power amp impedance, organ speakers [message #26928 is a reply to message #26927]

Sun, 26 August 2018 18:51

pleat
Messages: 1454
Registered: June 2004
Location: Belding, Mi

Senior Member

Yes, the Frankie amps and the K200 series amps are a 4 ohm total load amplifier. Kustom intentionally mis matched the impedance of the 2x15 cabinet using 16 ohm speakers wired in parallel for a 8 ohm total load cabinet beinging driven with a 100 watt 4 ohm amp. If you added a second 2x15 cabinet then the amp would see the 4 ohm load and was the main reason that Kustom were reliable when most other brands would fail when adding speaker cabinets.

pleat

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