Preamp and impedance question

I shouldn’t have use his amps as an example that couldn’t drive those JBL’s 1400 which IS fact and not fiction, "which even he agreed on" way back on the 9-17-2019 and here’s the proof! Ralph's answer https://forum.audiogon.com/posts/1804702 to my post before it https://forum.audiogon.com/posts/1803629
Your slipping Ralph, "one should always remember what one said no matter how old before saying the opposite" Confucius.

@georgehifi 

Uh, George, the M-60 is **not** one of our

big Atmasphere’s monoblocks

as you put it in your post above. The M-60 is our **smallest** monoblock and the S-30 is the only amp we make that is smaller. The MA-1, MA-2 and MA-3 are all bigger than the M-60. I'm not slipping or in 'protection mode',  simply instead insisting on facts. The M-60 won't drive a 2 or 3 ohm load, but our 'big monoblocks' can.


It would be correct in your post above to have said

the **small** Atma-Sphere monoblocks that my friend had, could not drive the bass of the "so say" easy load, high efficiency (90db), easy impedance load (8ohms) of the JBL 1400 Array speakers, because of the added -phase angle of the EPDR combination.

-however to be really accurate you could just drop the bit about EPDR and simply state that the M-60 can't drive a 2 ohm load but we could have told you that, and did. BTW, the efficiency of a 2 ohm loudspeaker with a 90dB efficiency is 84dB- not a good choice with **any** 60 watt amp. 90dB is not 'high efficiency BTW; that's a moderate efficiency. High efficiency would be in the high 90s or higher. 

Taken on board Ralph, with a yawn.
But for anyone to say EPDR (combination of impedance and -phase angle) "does not matter", is dreaming.

Your M60 mono blocks "could not drive the bass" of the JBL 1400 Array’s a 90db speaker without obvious stress playing the bass notes, even at "medium levels" and they were 100% fully functional.
And nowhere! near!! the EPDR load that a Wilson Alexia would present.

https://img.usaudiomart.com/uploads/large/1922864-fcdeac94-atmasphere-m60-mk-33-monoblock-otl-tube-a...

https://www.stereophile.com/floorloudspeakers/jbl_synthesis_1400_array_bg_loudspeaker/index.html

I think for someone to make this statement, they have to understand how EPDR impacts an amplifier. By all indications from what you have posted, you do not.

Taken on board Ralph, with a yawn.
But for anyone to say EPDR (combination of impedance and -phase angle) "does not matter", is dreaming.

Like I said anyone to say EPDR (combination of impedance and -phase angle) "does not matter", is dreaming.

The odds are very against you sunshine. Over and out👎

George,

Everyone reading this thread can see that I and atmasphere talk in very specific terms and in detail when we talk about EPDR. You are not fooling anyone but perhaps yourself.

Since you are such an expert on EPDR, tell everyone, specifically, what was inaccurate about atmasphere's post about tube amplifiers and EPDR. Here, I am reposting the relevant section:

Tubes are a bit different from transistors in a number of ways as we all know :) One of the ways they are different is the Safe Operating Area (SOA). With tubes you can exceed the SOA without damage to the tube if the tube is allowed to cool off afterwards. A tube dramatically overtaxed, such as in a loss of bias, can turn cherry red from heat, but if allowed to cool off, and the problem corrected, can continue to give normal service.