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Old 25th September 2011, 03:31 PM   #781
Javin5 is offline Javin5  Switzerland
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So here is one more question on the exaU2I.

Is there a way I can play via the exaU2i anything that plays on the PC, e.g. web radio? I suspect not, but I'm asking the experts here anyway to have it confirmed. Thanks for your answer.
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Old 25th September 2011, 07:26 PM   #782
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Quote:
Originally Posted by regal View Post
There are a lot of folks "into" the AD1862, AD1865, PCM56, PCM58, even PCM1702/1704. Good dac's really. But the I2S connection sans digital filter is always problematic. Wouldn't it be nice if the exa firmare or maybe even the driver software could be configurable for the DAC of choice. I mean this thing has 8 channels right? Why not for stereo split the I2S into L&R combatible format for these different DAC's. Just click the mouse to pick AD1865. It would be a huge advancement for all the NOS builders. Even if you aren't into NOS you could use the computer to upsample, which would allow a better analog filter. The potentital is there really, and with Hirez becoming more popular a 24/192 PCM1704 NOS DAC starts to make a lot of sense to even those not into NOS. Heck there are even reports of some new commercial NOS PCM1704 beating the PM2.

Just saying there is a potentital to really expand this. In a few years you can bet a lot of folks will be oversampling with their computer (custom PC digital filtering), this would be a step in that direction.
This is a great idea right here! Using software to make the exa compatible with all these old dacs should be possible. It could be incorporated in the exa dashboard. I'm running the AD1865 at 192 kHz in NOS mode right now, and it sounds absolutely terrific!
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Old 25th September 2011, 07:29 PM   #783
exa065 is offline exa065  Canada
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Quote:
Originally Posted by Javin5 View Post
So here is one more question on the exaU2I.

Is there a way I can play via the exaU2i anything that plays on the PC, e.g. web radio? I suspect not, but I'm asking the experts here anyway to have it confirmed. Thanks for your answer.
Hi Javin5,
You can play Internet radio with Foobar. You can also use a third party driver - Virtual Audio Cable to redirect the native Windows sound output to exaU2I. VAC supports up to 8 channels / 192 kHz. You can find the setup guide here: exaU2I DB - Installation and Configuration of Native Windows and ASIO Drivers.
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Old 25th September 2011, 08:34 PM   #784
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Hi exa065
Now I'm listening 2 way VST straight FIR channel divider, with..
foobar2000(ASIO) - (Reaper + 2 VST_FIR) - exaU2I.
This solution is very simple. great.
(but there is performance overhead for Reaper)

Screenshot: shows very sharp Low pass filter.
Source code: small enough, this is VST source code which has VST interface, FIR coefficient generator, and CUDA FIR logic.
(requires VST SDK and CUDA SDK to build)

The reason why I am sticking with Straight FIR (not FFT FIR) is, FFT FIR requires Hunning Window processing on input signal.
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Old 25th September 2011, 08:37 PM   #785
Javin5 is offline Javin5  Switzerland
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That sounds great. Thanks for your response. Because of the redirection of virtual audio cable, I guess there is no need for a sound card to be installed?
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Old 27th September 2011, 06:19 PM   #786
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Hi exa065
Here is my hardware, full digital 8ch amplifier.

exaU2I -> TI TAS5518 -> TI TAS5142.

TAS5518: accepts 8 ch, converts I2S to PWM
TAS5142: drives PWM signal

Now hardware is so simple, thanks to exaU2I.
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Old 27th September 2011, 09:17 PM   #787
exa065 is offline exa065  Canada
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Quote:
Originally Posted by KOON3876 View Post
Hi exa065
Here is my hardware, full digital 8ch amplifier.

exaU2I -> TI TAS5518 -> TI TAS5142.

TAS5518: accepts 8 ch, converts I2S to PWM
TAS5142: drives PWM signal

Now hardware is so simple, thanks to exaU2I.
Hello KOON3876,

Can you tell us more about your system? What kind of speakers do you use? Have you tried any high-resolution multichannel sources?
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Old 27th September 2011, 09:19 PM   #788
exa065 is offline exa065  Canada
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Quote:
Originally Posted by Javin5 View Post
That sounds great. Thanks for your response. Because of the redirection of virtual audio cable, I guess there is no need for a sound card to be installed?
That's right, there is no need for a sound card to be installed.
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Old 28th September 2011, 12:34 AM   #789
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Quote:
Originally Posted by exa065 View Post
Hello KOON3876,
Can you tell us more about your system? What kind of speakers do you use? Have you tried any high-resolution multichannel sources?
Hi Now I am using LINN Komponent 104.
(before I had also LINN Akurate 212)
This is 3Way speaker, Crossover can be bypassed.

Stereo Source, foobar etc -> Reaper+straight FIR channel divider -> exaU2I -> this amplifier (up to 4Way) -> Stereo speaker, multi-amplifier configuration.

So I am using exaU2I not for multichannel, but for Multi-way stereo configuration.
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Old 28th September 2011, 06:25 AM   #790
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That's an interresting configuration. Never seen an amp like that before. Is it a diy project, or is it store bought?
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