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post #2956 of 3452

nope. However if its the 240v version then none of the wires on the transformer have been cut like

the 100v only versions, and then you re-wire it for 120v which is easy.

post #2957 of 3452

Hi Kevin,

 

How do we quantify the performance of an electrostat amplifier? What unit of measurement should be used?

 

Also, as it is a seeming consensus that the SR-007 has greater amplification requirements, how do we measure this? It specifies the same 100dB / 100V r.m.s. 1 kHz and a lower capacitance relative to other models.

 

Regards.


Edited by dripf - 8/22/14 at 12:37am
post #2958 of 3452
Quote:
Originally Posted by kevin gilmore View Post

nope. However if its the 240v version then none of the wires on the transformer have been cut like
the 100v only versions, and then you re-wire it for 120v which is easy.
Thank you for your comment, Kevin, but I don't understand — do you mean "no, plugging the 240 V version into an American outlet won't work", or "no, it won't do any harm to plug the 240 V version into an American outlet"? If it's the latter, then I just don't understand how the amp could possibly work at all, as I have been assured (on another forum) it does.
post #2959 of 3452

The + and -350 supplies will end up at +/-175  so it will make some music.

but the bias will be off, the voltage range will be off etc. Person obviously

has no clue.

post #2960 of 3452
Quote:
Originally Posted by JayM481 View Post
 

Thanks for the answers and info so far. 

 

One question I'm pondering is whether the adapter/energizers are neutral? In other words, do they reveal the character of the amp, or impart their own signature? Also, what sort of load do they present to valve/tube amps? 

 

As I mentioned in my first post, I'm considering an energizer as a budget solution to using my earspeakers in a second system.

I tried an SRD-7 adapter on a number of different amps - tube and solid state- using SR-007 and Lambda Signature 'phones.  I did hear differences between the amplifiers. Kind of the same differences I heard from those amplifiers when driving speakers. 

 

Is the SRD-7 ALSO imparting a sonic character, in addition to what the amplifier brings to the party?  Yes, I would guess it does add some contribution to the sound.  Is an SRD-7 "more netural" than a Stax amp?  I don't know that you could really ever answer that. When I used the SRD-7 with a good amp, it sounded great.  That's all I could conclude.  My SRM-T1 sounds great too.  I think the T1 sounds a bit more "refined" than any of the amp-and-SRD-7 combos I tried, but I didn't do any blind A/B tests.

post #2961 of 3452
Quote:
Originally Posted by dripf View Post
 

Hi Kevin,

 

How do we quantify the performance of an electrostat amplifier? What unit of measurement should be used?

 

Also, as it is a seeming consensus that the SR-007 has greater amplification requirements, how do we measure this? It specifies the same 100dB / 100V r.m.s. 1 kHz and a lower capacitance relative to other models.

 

Regards.

You don't need to measure it to be convinced, us your ears. Anyone who has heard the 007s against the 009s and even the 507s will hear it needs more current to sing. The design of the drivers in the 007 was the first real attempt IMHO where Stax addressed the 'rest of the world' taste for some real bass, as apposed to transparency only. Maybe this was partly why it needed more current? The 007s is a great headphone, it was possibly a problem for Stax that none of their amplifiers available to the real public (no T2) was really capable of doing it any justice. 

post #2962 of 3452
Quote:
Originally Posted by astrostar59 View Post
 

You don't need to measure it to be convinced, us your ears. Anyone who has heard the 007s against the 009s and even the 507s will hear it needs more current to sing. The design of the drivers in the 007 was the first real attempt IMHO where Stax addressed the 'rest of the world' taste for some real bass, as apposed to transparency only. Maybe this was partly why it needed more current? The 007s is a great headphone, it was possibly a problem for Stax that none of their amplifiers available to the real public (no T2) was really capable of doing it any justice. 

+1. Which is when Geoff stepped in.......:wink:

post #2963 of 3452
Quote:
+1. Which is when Geoff stepped in.......:wink:

 

True. And hats off to Kevin G for his wisdom and generousity to the DIY community. I wonder if Stax have 'given up' the desire to market a Stat amp that aligns with their 007 and 009s? Even the lower models sound MUCH better when driven well by a BHSE or KGSShv. I have not heard the Woo Audio amps or the Eddie Current, but would bet they do the same as well.

 

Maybe Stax is still a small niche company who make probably the worlds best headphones. There are high end speaker manufacturers who don't make amplifiers, and who demo their gear with amps they deem having some synergy with their gear. I would think the market size for the 007s and 009s isn't big enough for Stax to survive, and they have to sell a 'system' with the headphones to be attractive to the general public.

 

It is interesting, that even with their IMO poor attempts at amplifiers, their headphone systems still sell well against none stats. It shows just how good the electrostatic headphones really are IMO.

post #2964 of 3452

I esteem the 3170 I use very highly. I'm after good knowledge of what I enjoy.

 

 

Quote:

Originally Posted by astrostar59 View Post

 

It is interesting, that even with their IMO poor attempts at amplifiers

 

Just recently you were confused over the topology of the BH. To be honest, you would be sent packing from any other hobby forum that did not involve audio.

post #2965 of 3452
Quote:
Just recently you were confused over the topology of the BH

Ehh? The BH is a KG amplifier, seems not relevant here. You know, you don't NEED to know the technicalities of this or that amplifier if you rate them with your ears.

The Stax 717 was not so bad an amp, but the cost v performance is not so good IMO. Better can be had IMO by going DIY or other none Stax amp routes. I spent 20 years 'stopping' at the SRM-313. I had to dig around the forums to realise there were other alternatives, and that is what makes these forums and this hobby so good.

post #2966 of 3452
What is so fundamentally wrong with the topology of modern Stax amplifiers excepting non-NFB (727) and unregulated power supplies (virtually everything else)?

I would agree they are overpriced, but I think the same for all electrostatic driver units, first-party or third-party -- be it overhead, base cost of the BOM or some combination of the two.
post #2967 of 3452

nothing wrong with the topology of current stax amps, and the 727 can be fixed and pretty easy too.

The issue with unreg power supplies is that of size. Cramming a fully regulated supply inside the

same size box is a big problem. And the extra heat is a problem too. Much easier to put big

external heatsinks on the box instead of inside the box.

post #2968 of 3452

Hello to everyone!

Sorry for the stupid and probably frequently asked questions. 

 

For now I used dynamic and planar-magnetic headphones, and have interest in electrostats. 

Currently I have Hifiman HE-400 on Schiit Modi+Magni, followed by Beyerdynamic T1 on Bottlehead Crack OTL. 

 

I was thinking about Stax 2170 system, or 3170 as comparable headphones in price. 

Would it be step up, or something else?


Edited by dreame77 - 8/23/14 at 4:24pm
post #2969 of 3452

I think it'll be a pretty nice upgrade but I very much dislike the T1 so basically any electrostat would be an upgrade over that HP in my eyes. :p 

post #2970 of 3452
Quote:
Originally Posted by dreame77 View Post
 

I was thinking about Stax 2170 system, or 3170 as comparable headphones in price. 

Would it be step up, or something else?

I think better if you buy SR-407 and SRM-323. I have this system and it sounds good. But sometimes all stax phones needs a little bass boost at equalizer (I'm using foobar2000). I cannot recommend you 2170 system and 006 amp.

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