bes51659

Very nice, audiology! Sound insulation to avoid ratle is important and a neglected area.

And as I've noticed that the fan in the PC box (voompc) makes a lot of noise!

As you've did, white, with a separate frame for your system and a single ground is the ideel solution but not always possible, and may only be part of the solution.

I have my PC and my poweramp set up like that (below),
, but I still have the problem with the HQCT located elsewhere (below)


(I've just installed in car, and did not realize where the problem lye before)

So I can insulate the HQCT and ground it and power it via cable at the PC to avoid ground loop. Or I can use SPDif as a noise proof link. In fact I might even use such a link for the microphone!

So I would like to get two pairs, analogue to spdif and back for the HQCT and mic, and one spdif to analogue for the PC to poweramp.
1) The analogue to spdif should have a preamp for mic.
2) And if the spdif to analogue had a few steps of amplification +6, +12, +18 dB it would be nice.
3) They have to be really small, mounted on the coax.

PC's have spdif out generally and so does USB soundboards. No need to do that again.

These 5 units would be worth maybe 100$ to me. Wishlist complete :-)

MP3Car.com

 

FPeter

yepp, that link is great!

there are some small thing about spdif:

separate spdif lines cant be connected directly because they are independent digital datas with their own clocks, and if you link them together, kills each other. a selector device should be used. and most of the soundcards unable to play directly the spdif in sound to spdif out like the line or mic to analog out. a software should be used that records and plays it in realtime (winamp line-in plugin, windsp, or other). only a few sound chipset handles itself, like creative emu10K1/2 on live, audigy cards, and as i know the advanced xfi cards (not lowprofiles)

now i use an sb live SB0100 card with kxProject driver, and it has 4 separate stereo spdif out, and 2-3 ins

the smallest size of the DAC is limited because power supply, digital and analog should be separated to aviod noise, and now i work on a remote modul to switch on/off the DACs

__________________
Intel D201GLY, 512MB DDR2, Samsung SP1213N 3.5" 120/7200/8M HDD, audio through digital line
bye bye noise - the DIY S/PDIF DAC

BLACKonBLACK98

looks ok, but the first thing that caught my eye was the 12v being ziptied to the l. speaker wire. no bueno.

much better examples

BlackStealth

I agree,my voompc-2 fans are too loud 32db I think. I replaced both fans with a 14db replacement fan at a cost of $30, I'm very happy with the results. CFM is about 75% of the original.

I'm keeping my eye on this thread as I'm always looking for improvement. lol.

greatwhite

I wonder if that guy knows he cut a major structural panel out of the vehicle just so he could get speakers in that spot?

I like good sound too, but not enough to compromise the structure of the vehicle.............

Looks like a nice wiring job though. Crimp and solder, only way to go............

__________________

galvitron

Well he did day that they bought the car specifically for competition. I have seen worse done to the structures of vehicles for sound competitions.

IMO, it is a pro job.

__________________
2006 Lancer Evolution IX MR In-Dash PC Project - WIP

Planning:
[----------] 100%
Purchasing:
[----------] 90%
Installation/Fab/Assembly (Revised v2):
[----------] 90%

audiology

To compete in IASCA and MECA they have to follow strict safety regulations. Thus, the area was probably structurally reinforced with fiberglass during the speaker installation.

__________________
[98%]

greatwhite

Structurally reinforced with fiberglass?

Ummmm,no.

__________________

MP3Car.com

 

audiology

ok... u win.

__________________
[98%]

FPeter

based on a question in an another topic, i write down how i made my pcb-s...

so, its a very easy method: only a laser printer, smoothing-iron and a special type of paper required, plus the liquid for etching. deskjet and other printers are unusable, only the laser uses a plastic-powder based toner!

the paper is not a regular printer paper. this is a shiny, but not too thick sheet. like the material of several magazines, like inner sheets of playboy and others. a minimal thickness is required because of the printing, the device might get a jam if its too slim... so some experimentation is required... you should print the circuit on the sheet, than clear the raw pcb board with toothpaste for the first, than with some solvent (like wound petrol from a chemist's). after it, you should lay down the sheet to the board, and put a clear printer paper on them. then comes the hot iron (steaming off). practicing is required here, you should find the point when the toner adheres to the board, but not squashes! after it soaking is required with some soap and water, then gently rubbing. when its clear, there is no paper on the free surface, you should put it to the etching stuff...

the quality depends on the laser printer (600-1200 dpi required for smaller smd parts), on the paper, and of course the practicing, but this can be learned easily...

__________________
Intel D201GLY, 512MB DDR2, Samsung SP1213N 3.5" 120/7200/8M HDD, audio through digital line
bye bye noise - the DIY S/PDIF DAC

FPeter

on the other side, im working on a new DAC... now i have a problem with the remote power on (might be the relay is overheating), but i will solve it...

__________________
Intel D201GLY, 512MB DDR2, Samsung SP1213N 3.5" 120/7200/8M HDD, audio through digital line
bye bye noise - the DIY S/PDIF DAC

kwchan

Are there any USB->Optical adapter that doesnt require driver installation?

I just need an optical output for my Alpine H700 processor

FPeter

nearly all cheap adapter works without driver installation as standard usb audio device, but they are dummy in this mode, there is no kernel streaming, asio, equalizer, eax support, etc... what is your problem with driver installation?

__________________
Intel D201GLY, 512MB DDR2, Samsung SP1213N 3.5" 120/7200/8M HDD, audio through digital line
bye bye noise - the DIY S/PDIF DAC

kwchan

I dont think i need those function as my H700 is able to do sound processing like time alignment and equalizer. I just want the audio data to feed into H700 digitally via optical cable.

I prefer no driver installation as my CPU is rather low end and I dont wish to overload it further with more drivers

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