LUXMAN L509X VS M700/C700U

@builder3  I think erik is sharing his thoughts and experiences 
I feel our personal experiences and witnessing some combo in action is more valuable than these big shot reviews 
erik what I understand that the first few watts is what it counts and 590 has enough watts 

I am calling my guy tomorrow to listen to 509 and cl 38uc preamp
unfortunatlwy they don’t have c700u for me to audition 

rizwanalimohd, I don't have an issue with erik sharing any of his experiences in the least. My issue is when he says things that he heard or read that don't make any sense, at least to me. I asked him to cite his source(s). However, since you're the OP, I'll bow out of your thread, rather than sidetrack it.
Best of luck with your search,

Don’t go stay builder 3 
the Dac is coming next week I will update the forum 

Hi @builder3

Eric, please cite your source on the all of you claims you made two posts up about the Luxman class A’s, legality of power ratings, etc, etc.

I have no issue at all with having my sources questioned, though I am not a paid contributor, so please keep your questions polite. I know it’s hard in an online forum, but I would appreciate it if you gave me the benefit of the doubt and treated me as some one trying to be helpful. I did cover a lot of ground in very few statements and I can see how it can seem to be incoherent.


Please understand that I really am a Luxman fanboy, so I was trying to be quick about my typing. I myself own a 507ux, which is A/B.

I will give you two hard fact sets, and then my inference.

First, the FTC rule I was talking about:

https://www.iqaudiocorp.com/pages/FTC-amplifier-power-spec.html


This is how Stereophile measures when they determine an amplifier’s legal power rating. It isn’t the only thing they measure. For more on that seek out Stereophile’s pages on their measurement process. If you’ve followed Stereophile’s amp reviews you’ve read a few times when amps did NOT make it past the warmup period. They shut down and had to cool off before they could be meausred fully.


Next, let’s talk about the Luxman 590. According to their website it is a 30W / channel amplifier:
http://www.luxman.com/product/detail.php?id=1#spec


I honestly believe that this amp will produce at least 30 W / channel per the FTC regulations. I was really more curious how it could be SOOOO very low in power, given it’s power consumption at idle and full power. Wow, that’s one inefficient amp, even by class A standards. :)  Fortunately my question was answered in this A’gon thread:


https://forum.audiogon.com/discussions/luxman-l-509x


Specifically with this British review:

http://www.navratilaudio.cz/novinky/Luxman_L590AXII_HFW.pdf


They measured it at 90W/Channel or 156W/channel into 4 Ohms. Substantially better than the rating of 30.
So, based on this, I make an inference that Luxman may have chosen to underrate the amp to keep the heat sinks in the same form factor as the other integrateds in the line, which was not a limitation on the stand-alone amplifiers.

That is, to meet the 90W/Ch rating of the FTC they could have kept all the circuits the same, but been forced to use much larger heat sinks.

You seem to have some strong opinions on amps you’re never seen or heard, but only read about.

Please explain what part you feel I was making unfounded claims on.

Best,

Erik

Interestingly, the 590 and 700u share output transistor topology and have very similar damping factors.

The m900 however uses 2x the number of transistors per channel, and cuts the output impedance by half.

As I wrote before, the issue I was most worried of is VERY easy to hear. The OP should have no issue at all judging for himself.