Unique Melody Platform Pure 6 (PP6) - review (1st post), discussion, appreciation, & tour thread - Page 6

You understand that the part in bold is totally wrong, yes?

 

The jh3a does not have perfect phase and time alignment--that is what the active crossover which Jerry failed to deliver would do. The jh3a only has passive crossovers, so it does not have perfect phase and time alignment, only imperfect approximations just like every single other passive crossover set-up out there.

 

As for the UM Platform Pure 6, we'll see, but as Anaxilus said, it'd be weird if they didn't make the most of their active crossover system.

that is where you are incorrect, the DSP inside of the JH3A still corrects for perfect phase/time alignment, and still has 3 seperate amplifiers feeding the earpieces. and from what i gathered the crossovers are just badpass filters for each set of drivers, as there are still 4 wires going to each earpiece.

 

the only thing Jerry didnt deliver on was the active crossover.

Passive crossovers are by definition not perfect. That's really the whole point.

 

I see no reason to continue to argue with you, but the phase and timing errors introduced are being compensated for by the DSP. of course the crossovers arent as good as if they were being done digitally, eg the slopes arent as steep, but that doesnt mean that Jerry couldnt still time/phase align the sound with the DSP

Guys no offense but lets please get back to the Platform Pure and stop debating passive vs active crossover. We can all debate the technology involved all we want in the end it's all conjecture until average_joe or project86 or whoever gives us some solid impressions on what this new CIEM sounds like. It can have all the buffering and crossover technology in the world if it's not well implemented during the design process the CIEM will sound like complete crud.

Edited by DigitalFreak - 6/10/12 at 5:19pm

By my understanding, the JH3A dac/dsp splits the signal into 3 parts which are phase/time corrected for the mated ear pieces. The compromise that Jerry had to make was in not actually outputting the signals discretely through the 3 separate dacs. Instead, he's outputting the full range of sound through each of the 3 dacs, which are then amplified separately. It is a passive crossover because the hi/mid/low freqs are split AFTER amplification (in the earpieces, in this case), however the phase/time is still correct since the outputted waveform from the DSP includes the corrections. I agree that this should result in a much larger gain in "SQ" vs simply amping the 3 sections discretely as an active crossover would. (I agree with the comments that this would probably make more difference in larger speakers that demand more power.)

The technological part that really turns me off on all this is that the JH3A now has all these extra components that don't seem necessary: If you aren't going to actually have an active crossover, it seems to me that the 3A should be able to get away with a single DAC output, a single amp, and the same passive crossover separating the frequencies again in the earpieces. Shoot- at that point, he could even eschew the funky headphone plug and use a regular 1/8" one... and add a switch to turn off the phase/time correction so any ol' headphone could be used with the amp! ... and the headphones could be used with any amp (of course without the phase correction).

What he's ended up with is a unit with redundant electronics... it uses more battery juice than it should.

In spite of all this though, I really feel like I could have gone forward with the JH3A if JH wasn't so tricky. It seemed their otherwise reasonable customer service took a serious turn when dealing with that unit.

Disclaimer: This stuff all seems correct to me, but I don't consider myself an expert, and I could be Wrong somewhere.
Edited by thread - 6/10/12 at 7:39pm

I think I need some explanations. 

 

How much can phase correction help, other than eliminate some incoherence?

How better will be a matched amplifier compared to a common one?

 

I know still isn't possible to determine how good they will be, but do you guys think it's going to be better (or at least very comparable) than CIEMs like the 5-Way or the NT6 Pro?

You should also ask about active crossovers versus passive ones.

so they never responded to my question on the Facebook pics...even though they did post the link the this thread...which makes me think they were avoiding it

 

From the little I know, active crossovers doesn't add undesired impedance and since the system will be bi-, or tri-amplified in this case, it will considerably reduce the load for each amp. It means less distortion and better control. The interesting part is how this will compete with the 5-way CIEM options. 

This really is the time to be an audiophile!  The pace of technological developments in personal listening is almost overwhelming... 

 

Can't wait for it to catch up to car audio someday....

Guys, more technical details will be published at a later date. 

I've been putting off making the leap to CIEM's for awhile now. Your details could be the deciding factor on me finally getting my first ever custom