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Build Your Own XA-U40D - Sort Of...

 
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Matt Dralle
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Joined: 08 Nov 2005
Posts: 19959
Location: Livermore CA USA

PostPosted: Sat Oct 17, 2009 8:59 am    Post subject: Build Your Own XA-U40D - Sort Of... Reply with quote

Quote:
In next month I will begin build my new sound system.

I will make all with sony old school produtcs.

Products that I already have:

cdx-c90 head unit
xdp-4000x processor
xm-7557 amplifier
xm-7527 amplifier
xs-hs6 midbass
xs-hs4 midrange
xs-hs1 tweeter
xs-hs12 subwoofer
cdx-838 cd changer
cdx-848x cd changer
mdx-65 md changer

I need one problem. I no have sony xa-u40d because hard to find. Do you know how i can make work 3 changers with optical cable? I see in your site one adapter that you same made. Do you can made more this?

Thanks
Bruno

Hi Bruno,

Yeah, the XA-U40D was pretty hard to find back in the day. Now they're almost impossible to come across. When I did the install in my Corvette, I didn't know they made an XA-U40D, but I had three CDX-838 changers and wanted to use the optical output. My problem was compounded by the fact that I also had two XDP-4000X processors so I needed to combine the three outputs and split them back out into two active links. On the LED-based TOSLINK fiber drivers, the light output is pretty low to begin with. Building an array of passive combiners just didn't work. There wasn't enough light left to drive the XDP-4000X reliably.

So, I designed an active combiner/splitter circuit and put the whole thing in a nice project box. I used a standard XA-30 for the bus switching, then interconnected all of the fiber optics links using the combiner/splitter. After 8 years, the system is still working great. I really love the sound quality of the C90/XDP-4000X. I just wish the display was brighter on the C90. I've got no plans to upgrade the system in the Car or the Truck; still extremely pleased with the performance.

I've attached a PDF of the splitter/combiner circuit, some photos of the circuit board and enclosure I made, and then a couple shots of the finished product for fun.

Best regards,

Matt Dralle


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Matt Dralle
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Joined: 25 Aug 2009
Posts: 6

PostPosted: Sun Oct 18, 2009 7:17 pm    Post subject: Build Your Own XA-U40D - Sort Of... Reply with quote

Hi Matt,

Great sound your have. Congratulations.

I have xa-300 and xa-c40, but i dont have optical adapter. I leave in Brazil and here is very hard to made this opitcal adapter.

Do you can to make one for me?

I pay your for this.


Thanks a lot Matt
Bruno

--- Em sáb, 17/10/09, Matt Dralle <dralle(at)matronics.com> escreveu:

Quote:

De: Matt Dralle <dralle(at)matronics.com>
Assunto: Build Your Own XA-U40D - Sort Of...
Para: xdp4000x-list(at)matronics.com
Data: Sábado, 17 de Outubro de 2009, 9:59


Quote:
In next month I will begin build my new sound system.

I will make all with sony old school produtcs.

Products that I already have:

cdx-c90 head unit
xdp-4000x processor
xm-7557 amplifier
xm-7527 amplifier
xs-hs6 midbass
xs-hs4 midrange
xs-hs1 tweeter
xs-hs12 subwoofer
cdx-838 cd changer
cdx-848x cd changer
mdx-65 md changer

I need one problem. I no have sony xa-u40d because hard to find. Do you know how i can make work 3 changers with optical cable? I see in your site one adapter that you same made. Do you can made more this?

Thanks
Bruno

Hi Bruno,

Yeah, the XA-U40D was pretty hard to find back in the day. Now they're almost impossible to come across. When I did the install in my Corvette, I didn't know they made an XA-U40D, but I had three CDX-838 changers and wanted to use the optical output. My problem was compounded by the fact that I also had two XDP-4000X processors so I needed to combine the three outputs and split them back out into two active links. On the LED-based TOSLINK fiber drivers, the light output is pretty low to begin with. Building an array of passive combiners just didn't work. There wasn't enough light left to drive the XDP-4000X reliably.

So, I designed an active combiner/splitter circuit and put the whole thing in a nice project box. I used a standard XA-30 for the bus switching, then interconnected all of the fiber optics links using the combiner/splitter. After 8 years, the system is still working great. I really love the sound quality of the C90/XDP-4000X. I just wish the display was brighter on the C90. I've got no plans to upgrade the system in the Car or the Truck; still extremely pleased with the performance.

I've attached a PDF of the splitter/combiner circuit, some photos of the circuit board and enclosure I made, and then a couple shots of the finished product for fun.

Best regards,

Matt Dralle

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