Music Reference RM Mono?

I'm think another 3db is volume isn't going to make any difference to me, but....

That's what Roger basically told me. My room is 18.5 x 14.75, and we listen to the same type of music. I'm even light loading mine and do not notice any side effects. There is plenty of oomph.

Roger did mention there might be some improvement in separation, but he didn't seem to think it would be revelatory.

The RM-10 power supply is overbuilt by a factor of 10x. I have to imagine the two channels can coexist just fine with something that overbuilt. Also, with Roger's custom written application for an EL-84 circuit (that generates 35 watts where others struggle to attain half that) the amp is designed to run effortlessly in stereo mode. I just cranked out Machine Gun and Hear My Train a Comin' from Jimi Hendrix Live at the Fillmore and there was no hint this amp was struggling.

The RM-10 was designed to be efficient, reliable, and affordable. IIRC, the main reason for it's existence was to drive Roger's Quad ESL 57's. If there was ever a speaker that required RM-10 monoblocks to drive them, I'd have to think the ESL 57 would qualify.

Like Pubul57 I figured RM-10 monoblocks would just be plain better, but Roger shot straight with me so I'll defer to him. I'm sure some amps are designed to be monoblocks or work better in bridged mode. Perhaps the RM-10 does in certain applications, but I have easy to drive speakers with a smooth impedance curve so perhaps mine isn't the best scenario.

BTW- I also own a set of VAC monoblocks. They're sitting in the closet right now. I'm not even tempted to pull them out even though the weather has cooled quite a bit of late and the extra heat would be beneficial.

I have NOS Telefunken EL-84's and tried them in the RM-10. Roger's stock tubes were just as good sonically, and quieter to boot. I've never heard the Mullards, but for the cost I'll stand pat.

Roger commented that he's had to return the last couple of batches of the Genelex reissues. I'm waiting for him to give the okay on the new batch he's testing. Nothing against Jim, but I'd prefer to buy from Roger since it's his amp.

Agree with Jaffeassc, speaker impedance curve would play a big part as to whether stereo or monoblocks would be needed.

Yes, it's more linear, especially noticeable in the lower frequencies. Not sure if this is due to lower distortion or the fact there is less stress on the tubes and the amp operates more efficiently. In some ways it appears to have more balls which is evident in transient attacks. You would not think this to be the case since it loses about 25% of it's power, and a little more with my speakers since they operate at around 10 ohms on average. Pretty incredible design is all I have to say. A local friend of my has an early RM-9 and the RM-10 is much cleaner at about 25% of the rated power of the RM-9.

Not unless I am too:)

Yes, for now I am. Roger is testing a new batch of the Genelex reissues and if he makes them available I may try a set of those.

Jim, I regret to inform you that Paul recently passed away. As a friend and fellow RM-10 owner Paul and I have had many conversations about this amp and his speakers. I will send you an email and perhaps I can assist you.