late 70's UL super reverb speaker impedance

[dinkotom]

Does anyone have this amp? I'd like to know the individual speaker impedance for this amp, schematic says 16 Ohms: http://schematicheaven.net/fenderamps/c ... tr_rev.pdf

But I have four 8 Ohm speakers (they look stock, blue fender label, CTS I guess) in my amp, paralleled total load measured is 2.3 Ohms.
The back of the amp says 4 Ohm minimum load. My best guess is that the previous owner replaced the speakers with incorrect impedance. Or Fender screwed up...
Will upload some pics later..

[Firestorm]

That OT has two secondary taps. Check the wiring to the jacks (one is a weird switching jack) to see if the amp was set up to use the yellow-green 2 ohm tap with the 4x8ohm speakers.

[DenDanger]

The schematic would indicate 4 ohm to each jack.
If the jacks are still wired stock, then just connect 2 speakers to each jack.
Each pair in parallel.

Good luck,
Denny

[Firestorm]

It is 4ohm for each jack, but when only the first jack is used, the OT's 4ohm tap is connected; when the second jack is also used, the 2ohm tap is connected.

[Stevem]

It's good that the amp has 8 ohm drivers and that they are CTS , as the Utah drivers these amps came with have a lower SPL rating than the earlier CTS drivers, the CTS ones likely have the much preferred seamed thin cone also !

With them being 8 ohms you can wire them in series parallel to tame some of that amps harsh top end ( inductance difference ) that the 1976 and up amps seem to have and then also by running the 8 ohm tap on the OT use the full secondary winding that it has and you will reap the better tone of having that going on also !

Not to mention that it's less stress for the OT too when the full winding is used!

If the amp / speaker combo is not too brite then wire the speakers in parallel series .