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1. 09:59 AM - Build Your Own XA-U40D - Sort Of... (Matt Dralle)
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| Subject: | Build Your Own XA-U40D - Sort Of... |
>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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