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In Reply to: RE: Anyone Running Citation II's as Mono Blocks? posted by mr9iron on December 10, 2015 at 11:12:52
Hi,
If your speakers are 16 ohm you can not properly operate the Citation II as a mono amp. A 32 ohm output transformer would be required which the Citation, like most tube amps, does not have. I operate two Citation II's as mono amps driving a pair of 8 ohm JBL Sovereign S7R speakers and it works very well.
Follow Ups:
Yes,I think this is the culprit. The more I read, I think this is why it didn't sound right. I know my speakers need 16 OHM. I once tried them on the 8 ohm setting in stereo, and they sound terrible, and thin, very similar to how it sounded on my experiment.
It's good to consult, this is why I figured I would send out the idea before gearing up for a another project..
thanks!
I don't think it is a problem to run 16 ohm speakers on an 8 ohm tap. At least not with quality output transformers like the HK. Running more than double or less that half could be trouble. It depends on the amp. It will lower the power output of the amp, which may defeat the purpose of strapping.
Dave
Dave,
I think you are right, and I am not saying it doesn't work or would be harmful, as I tried it on one speaker, I just noticed it "doesn't sound well" dynamics are lost bass is flat, just doesn't sound good like I actually lost "umph" instead of increasing it....
Does anyone have any experience doing the phase inverter method? I heard of this before but also heard there is sound quality issues..
thanks for the comments everyone..
J
"Does anyone have any experience doing the phase inverter method? I heard of this before but also heard there is sound quality issues."
Bridging, which is driving the 2 channels of a stereoblock containing a common ground with out of phase signals and connecting the speaker cables to the "hot" terminals, can work where parallel connecting the channels fails. Plenty of reports of overheating and bad sound can be found, when paralleling has been tried. :> ( Bridging sums the voltage swings of the amp sections in the load. The method is particularly well suited to your situation, as you have 16 Ω speakers. As each section of a bridged amp "sees" only 1/2 of the load, 16 Ω speakers get connected to the 8 Ω speaker taps. :> ) Bridging is a problem when 4 Ω speakers are on hand, as 2 Ω taps don't exist.
If your preamp has a low O/P impedance, a pair of Sowter's model 8920 transformers will take care of the split phase requirement.
http://www.sowter.co.uk/specs/8920.htm
If your preamp's O/P impedance is unimpressive, you may have to build a buffer or an active electronic bridging adapter.
Eli D.
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