Upcoming PMG signature amp

Audio Components Amplifiers
122

Thanks for finding this link. I had to look a bit but found it. Oddly the new amps are not in the drop down menu.

123

Thanks, Elk. Yeah the website’s not finished (which is why folks are having a hard time finding it :blush: ) but I’ll be adding more graphs and scope stuff on this truly remarkable amplifier of Darren’s.

124

Thanks and it’ll put a big smile on your face. Guaranteed.

125

Looked up Stereopiles M1200 measurements. Those were quite good. The PMG amps specs look amazing.

https://stereophile.com/content/ps-audio-stellar-m1200-monoblock-power-amplifier-measurements

126

I have the M1200s and have been very pleased with them. As the PMG Signature S400 becomes available, I’d be interested to hear any thoughts about moving to it from the M1200s (rest of system is SG Preamp, DSD DAC MKII, and FR 10s). I don’t think the budget will allow moving to the PMG M400s.

Bob

127

The photo showing the back view of the M400 seems correct to me. The red on the binding post probably indicates + terminal for phase, not the right channel. And there are two pairs of binding posts for those who want to biwire to their speakers.

128

Was reading about the PMG S400 and found a typo/copy-paste error in the APPLICATION section. It states output as 100W rather than 200W.

APPLICATION

100 watts into 8 ohms per channel, doubling to 200 watts into 4 ohms per channel,

129

You are right, Bruce. Just checked it out - and it is the correct photo now of the back view of the PMG M400.

Thank you, PS Audio, for taking care of this so quickly!:grinning_face:

130

Good catch! Fixed. Thanks.

131

Well, to be fair to Walt when I read that I updated the photo to be the correct one. :blush:

132

So to be sure I understand the listed specs in the manual, the M800 puts out less power than the BHK 600, but more of it is Class A. My MartinLogan CLX Art speakers are truly current-devouring beasts, with impedance that drops to less than 0.5 Ohms at some frequency. Could I still expect the M800 to drive them better than the BHK 600?

133

Thanks, Paul! I’m sure it’s been a long hard road to get development of these new amps to this point, but must say it’s looking good. I did see and hear the PMG 800s at Axpona but the M400s are interesting to me as well.

134

Paul,

I see now that the M400 has a subwoofer out option with a 4-pin cable that can connect to the F12 subs.

Where can I buy these high-level output cables?

I normally use the other pair of line out balanced XLR cables from the pre-amp to the subs, but when I get the new M400’s, I will want to connect them direct from the amps like you often recommend.

Thanks

135

We will be making these available custom built through us.

136

Oh yes, for sure. Can’t wait for you to try it.

137

Thank you, Paul. That is great news. I will order two 10-foot special 4-pin cables for my subs so they can be made in time before the M400’s arrive.

138

To those wondering about power ratings, Paul said they are now rated at 4 ohms. Previously they were rated at 8 ohms, so comparing BHK/Stellar vs. PMG model need to take that into account. For example, the BHK 250, rated at 250 W at 8 ohms, would be 500 W at 4 ohms.

139

Two questions about the square wave:

  1. the description says “35vrms 10kHz square wave 8 ohms”. Is that correct? It looks like 250mv per division on the vertical scale and the square wave swings between +1 volt and -1 volt. I’m not sure why an RMS measurement is used here but at any rate shouldn’t the rms of the waveform be roughly 1 volt? Also, is the 8 ohms a resistive load? The M400 and m800 listings on the website (now posted!) include these graphs but do not include this description. And in that region the measurement would be with the amplifier operating entirely Class A?

  2. Does the high slew rate of the amplifier imply it also has a high damping factor? I’m wondering what the damping factor is of the M400 and M800. (edit: Now I can answer my own question-- at least the second part-- apparently I just didn’t see the damping factor in the specs but it’s there: >300 at 8 ohms (20Hz to 1kHz) for both the M400 and the M800.) That’s pretty good, so the high slew rate should also be very good for a real-world loudspeaker load as well?

140

It should be 35mv. Let me fix that.

141

Have M400 specs for S/N ratio, wideband and A-weighted, been posted?

I just added 2 new room ceiling panels (had 3), various speaker feet trials, and PMG preamp vs Krell Illusion over the past 3 weeks. All change everything in different ways.

Until you sell me the M400 amps, I could be making big mistakes in my purchases or selections, as each thing has a dramatic change, and if they do not have synergy, I have to start over. Trial and error.