OHM SWEET OHM HELP, PLEASE

Buzz Fluhart · #1 03-17-2010, 10:00 PM

Hello Everyone. I need some advice please. I want to purchase a vintage Randall RB-120 bass head (see link to photo, below) and on the back the Speaker Jack states "Output 120 Watts RMS at 4 ohms, but right above it, states "External Speaker 8 ohms"(see link to photo, below). This resembles something I've seen on many combo amps with an extra (external) Speaker Jack, bot not on a head-only unit, such as this, with no speaker. This amp head was not cut away or removed from a combo unit...it was manufactured this way. I am wondering what OHM cabinet I should use to obtain full power....4 or 8 ohm? I was thinking that Randall mass produced RB-120 combo amps and just didn't bother to print a new label for the head-only unit, such as this one.
Any help or information y'all can provide will be greatly appreciated. Thanks Everyone.

Rick Auricchio · #2 03-17-2010, 10:17 PM

I'm inclined to agree with your assessment of the situation.

It appears the amp is fine at four ohms, and that a combo version had an internal eight ohm speaker.

TurboNemesis · #3 03-17-2010, 10:19 PM

are there any more 1/4 inch outs? You could probably play it through a 4 ohm, but you could just get an 8 ohm and be safe...then later add another 8 ohm cab, if it's truly a 4 ohm head

Buzz Fluhart · #4 03-18-2010, 12:40 AM

Quote:

Originally Posted by Rick Auricchio

I'm inclined to agree with your assessment of the situation.

It appears the amp is fine at four ohms, and that a combo version had an internal eight ohm speaker.

Thanks, Rick. I appreciate you taking the time to review and respond to my inquiry. Be well, stay safe, and let music live within you !!
--- Ken

Buzz Fluhart · #5 03-18-2010, 12:57 AM

Quote:

Originally Posted by TurboNemesis

are there any more 1/4 inch outs? You could probably play it through a 4 ohm, but you could just get an 8 ohm and be safe...then later add another 8 ohm cab, if it's truly a 4 ohm head

No, Turbo...just one Speaker Out Jack, which is what's confusing me. Not only does it state "Output 120 Watts RMS @ 4 ohms", but "External Speaker 8 ohms" also....which is weird because since it is only a head, ANY speaker used would have to be "External". But I have both 4 and 8 ohm cabinets and will take your suggestion of using an 8 ohm cabinet just to be safe. Thanks very much for your time and help with my inquiry. Be well and keep playing !!