Whoa. All hail the PPA!
Jun 12, 2003 at 3:52 AM Thread Starter Post #1 of 34

eric343

Member of the Trade: Audiogeek: The "E" in META42
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Just got back from a minimeet with ppl and Larry (his friend whose Head-Fi name I don't know), and xtreme4099 showed up later, too.

All I can say is the PPA (or at least the way it stands now; apparently some of the other team PPA members want to change some stuff... to them, I say that ppl's the one with the audio design experience, listen to him!) is insane. Seriously amazing, in fact.

It's very neutral and transparent - it doesn't have a 'sound' that I can identify, unlike the CHA47, Wheatfield HA-2, Sudgen Headmaster, and similar (apparently the HeadRoom amps could also be listed here, but I haven't heard those!). What it provides is the MUSIC - with absolute authority and more than enough bass kick to satisfy the most demanding basshead while introducing him to the finer sides of audio, like treble.

And treble it had in spades, too, in a way. The PPA let the headphones shine, it gave the headphones everything they need and let them do what they wanted with it. The HD600s sounded laid-back with a mid-bass hump, the Grado HP2s forward, lively, and utterly neutral, the V700DJs utterly crappy with boomy bass and boomy mids and they'd have boomy highs if it were possible, I'm sure. This is, I suppose, an offshoot of the fact that it drove every headphone that we had there well - apparently even K1000s sound good off it, and they seem to be the benchmark for hard to drive headphones.

Now I just gotta hear Ppl's discrete reference amplifier design... apparently it's a pretty good power amp at 400 watts per channel.
 
Jun 12, 2003 at 4:04 AM Post #2 of 34
Sounds like they've done a great job!

Quote:

Grado HP2s forward, lively, and utterly neutral


Utterly neutral and forward seem to contradict (?).
 
Jun 12, 2003 at 4:08 AM Post #3 of 34
Yes, I thought about that, but in this case I didn't mean them to... the HP2s are neutral in that they don't color the sound nor do they have any apparent artifacts in the frequency response (measurement tools will probably prove me wrong). Yet they're forward in that they put you next to the performers, on stage, as opposed to in the middle orchestra rows (like the HD600s); they're neutral even in this sense that they WILL put you in said middle orchestra rows if that's how the recording is. But most aren't...
 
Jun 12, 2003 at 4:42 AM Post #4 of 34
I had the chance to listen to the prototype that KurtW brought to my meet over the weekend. It would be an understatement to say that the amp sounded very very good. A lot of body, richness, and detail to die for.....of course it is difficult to really listen critically in the surroundings of a meet, but hopefully I will have the opportunity to listen to one in a more ideal environment.

I think PPL, Morsel, Tangent, and Kurt have the foundation for a killer amp.
 
Jun 12, 2003 at 4:47 AM Post #5 of 34
Any idea how much an average one of these guys will cost? (Parts)

-dd3mon
 
Jun 12, 2003 at 5:41 AM Post #6 of 34
Quite a bit... there's 12 HA5002 buffers and 3 AD8610s (at $6 each) used, not to mention a bunch of caps (expensive film types, in many cases) and 4 TLE2426s (well, they're only $1.50 ea, but still). The goal here was NOT to make a budget amp, but to make the best damn amp possible and still have it be something approaching a semblance of portable. In my opinion, they succeeded beyond what was previously thought possible...

...and hey, be glad the money goes toward components and not $100-$200/ea expensive audio caps... because guess where it's better spent?
smily_headphones1.gif
 
Jun 12, 2003 at 5:45 AM Post #7 of 34
hmm... pricey... mmm nice... cant work out whether to build a meta now or wait and see what this will be like. just dont know how much better it will sound...
 
Jun 12, 2003 at 6:05 AM Post #10 of 34
Well, the PPA is portable in the sense that the HeadRoom Cosmic is portable...

...and from what I've heard from the California meet, the PPA doesn't just rival similarly priced home amps, it rivals home amps in the $1700 range...
 
Jun 12, 2003 at 11:27 AM Post #14 of 34
Just a question.

The ground signal for the AD8610 comes from the TLE2426. If I have an ground channel, would it be the same if use FET isolate the ground to replace the rail splitter? Same like FET Isolated Power Rails?

Anyway I will be building the DC-DC to converter tonight. Replacing the 4AA battery instead of 18 AAA batt. Hopefully my buffer don't get warm this time...
biggrin.gif
 
Jun 12, 2003 at 4:13 PM Post #15 of 34
Oh my gosh, I cant wait....I know alot of people wanted this thing to be made simply for home use but I'm absolutely drooling about the fact that it will be possible to listen to great sounding music wherever I go! Keep up the phenomenal work guys!
smily_headphones1.gif
 

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