Has anybody put a SRC in a DEQ2496? - diyAudio
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Old 4th February 2009, 01:40 AM   #1
jscoe is offline jscoe  United States
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Default Has anybody put a SRC in a DEQ2496?

I'm looking for a worthwhile project to help my sound and am thinking about adding an SRC4192 or AD1896 to my venerable DEQ2496 for better jitter rejection. Has anyone done this? Is worthwhile to do?

Would the best place to put it be after the DAP and before the DAC? Would a clock with low jitter board like Tent labs or a board like the Twisted Pear's Metronome be the way to go?
Or am I just likely to screw up something that already works good?
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Old 4th February 2009, 05:01 PM   #2
jonners is offline jonners  United Kingdom
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What you are proposing sounds challenging. I did the same kind of thing more simply by upsampling with a Behringer SRC2496 before my DEQ2496. I think there was some improvement but not a major change.
I think it makes more sense to upsample before the DEQ rather than after so the DSP can work at the higher rate.

John
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Old 4th February 2009, 06:24 PM   #3
bwaslo is offline bwaslo  United States
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But wouldn't that leave the jitter injected by the PLL (of the DEQ's input receiver)? I thought the asynchronous sample rate converters are used so that the digital to analog converter could use a direct crystal oscillator as its clock.
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Old 4th February 2009, 07:13 PM   #4
jonners is offline jonners  United Kingdom
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Bwaslo -

You may well be right. My knowledge doesn't extend too far in this area.

John
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Old 5th February 2009, 12:52 AM   #5
bwaslo is offline bwaslo  United States
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Jonners,

My knowledge isn't all that deep on this either, I've just been recently reading up on it, no actual experience.
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Old 6th February 2009, 02:20 AM   #6
sendler is offline sendler  United States
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Default Dac swap and direct out mod

I haven't changed any clocks yet but have an Oettle receiver/clock on order for my DCX2496 which is said to make a big improvement. I have a hard time anticipating how much more improvement could be left because my modified DEQ sounds so good already. I have swapped the dac chip to AK4395 which allows running the analog direct out with no buffers or filters. Nothing between you and the best dac chip but a high quality coupling cap. The 4396 is very nice as well and drops in with no additional voltage supply mods.
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