'Perceive' Contruction Diary

[ScottG]

Originally posted by ShinOBIWAN
Scott I'm a little concerned about the mms on the 215 GMF - 10g! You sure that's right? According to the Supravox website, yes, but I'm wondering just how well defined the bass will be with such a low mass cone.
Surely the stiffness isn't upto the like of the Seas, so will I be looking at a loss in definition on the low bass(40-80hz) with an edge in transparency through the mid to upper bass?

And are you sure the 'vox will be good to go sealed with aperiodic? I'm somewhat weary of sealed after the Seas let down.

Cheers.

It should be "hyper" detailed. The reduced mass actually has less energy storage so "definition" is better. Trust me on this one (..even though I've never heard the driver) - if you don't need an extreme amount of "slam" then this is THE driver (in this passband). I know virtually no french, but look at the translation for the 215 GMF:

http://translate.google.com/translat...lr%3D%26sa%3DG

Of course the translation isn't exactly accurate, and its based on marketing - but doesn't the description sound about right?

For the loading scheme:

Yes I'm sure, but the volume needs to be large enough and the other "enhancements" I've suggested will further aid in making this superior to any bass reflex alignment.

The new shape is better than before with regard to standing waves, BUT it doesn't look like it will support nearly enough volume (just a guess though). Still, you would be better off if NONE of the surfaces were parallel - currently the side panels are parallel. Incedentally, with double wall construction (with an air gap between the walls) you could make a cabinet on the outside that looked similar to the one you had b4, but that has no parallel interior surfaces. In any event I don't think its really necessary with the forumla I've provided - but the shape does look cool. As to vent placement with this, your guess is as good as mine.

[ShinOBIWAN]

New thread started for the v2.0

Here

This one was getting too long and diluted

Thanks to all those who helped me out on the v1.0 (the one in this thread) especially to Scott & Vil. The v2.0 is just an incremental upgrade that refines and takes advantage of the lessons learnt here along with improved midrange, bass drivers and cabinet design/construction.

[agent.5]

I finally got a pre-owned prodigy 7.1 and am interested in moding it the same way that you did.

In your post,

http://www.diyaudio.com/forums/showt...905#post671905

you posted the following pic of the audiotrack dataout

Just to clarify:

Is the L/R (next to X1) equal to LRCK
and what is the 64F (??) above the audiotrak chip? Is that the SCK?

I assue that D1 to D4 are the data out lines.

One side of these resistors are marked with green color. Can I assume that these are the points that I take the data out?


I noticed that X1 is 24.576
and X2 is 22.5792. Can you tell me which clock frequency do you use to sync the external DAC?

[Vil]

>>>Is the L/R (next to X1) equal to LRCK

yes , thats left/right clock at 1xF .


>>>and what is the 64F (??) above the audiotrak chip? Is that the SCK?

yes , right thats SCK at 64xF .

>>>I assue that D1 to D4 are the data out lines.

yes

>>>One side of these resistors are marked with green color. Can I assume that these are the points that I take the data out?

yes

>>>I noticed that X1 is 24.576
and X2 is 22.5792. Can you tell me which clock frequency do you use to sync the external DAC?

none of those . I am using my own low jitter clock oscillator ,
24.576 for 48 , 96 , 192K
and 22.5792 for 44 , 88 , 176

[agent.5]

>>>I noticed that X1 is 24.576
and X2 is 22.5792. Can you tell me which clock frequency do you use to sync the external DAC?

none of those . I am using my own low jitter clock oscillator ,
24.576 for 48 , 96 , 192K
and 22.5792 for 44 , 88 , 176

Thanks for your reply. I am going to have low jitter clocks (hopefully tent will have the frequencies) feeding x1 and x2. I will also have the tent clock at 24.576 feeding the dacs too.

[karmaz]

damned! Vil outstanding job!
It's exactly what I have wanted to do for one year.. but my knowledge in electronic doesn't allow me such a thing

...Reclocking cheap Prodigy souncard>Envy24HT I2S Line>cheap Panny equibit receiver=true digital jitterless path... my poorman TACT Dream.


But why all these Ethernet wire ??

What do you think of Brian Brown multi channel I2S transport with TI MuxIt TX/RX? small,elegant, and only 1 ethernet wire.
High Resolution Multi-Channel Digital Interface

[Vil]

I use Cat 6 cable because its cheap and good solution to get 4 twisted pairs in compact size. I need 2 cables for left and another 2 for right speaker data transmition - one cable transmits data1, data2, L/R and 64F (SCK) - another just for master clock (to have minimal jitter) and volume (transmits some data just when volume changes). dac's , analog volume control and amps are located inside of every speaker .

[KAINO]

Is it a good measure

[KAINO]

Originally posted by KAINO
Is it a good measure

photos...