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Old 19th October 2013, 12:25 PM   #1
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Default ad1955 vs wm8740

Any opinions on ad1955 vs wm8740
I'm plan on buying:
"www.ebay.co.uk/itm/YJ-AD1955-WM8805-PCM2706-Fiber-Coaxial-USB-DAC-/200826817482?pt=US_Amplifier_Parts_Components&hash =item2ec2360bca"
or
"www.ebay.co.uk/itm/coaxial-DIR9001-WM8740DAC-decoders-USB-coaxial-G-1-/200723854975?pt=UK_Sound_Vision_Other&hash=item2eb c12f67f"
Any opinions on which is better, worse?

Last edited by jonciukelis; 19th October 2013 at 12:37 PM.
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Old 19th October 2013, 04:13 PM   #2
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Since AD1955 requires external opamps and WM8740 has internal CMOS ones, I'd hazard that the former was better provided reasonably RF-resistant opamps are chosen and its fed with a non-jittery clock.
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Old 19th October 2013, 05:09 PM   #3
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I didn't exactly catch you there...
There op-amps are the same (op275), i think, only that the ad1955 has three of them...
The receivers in both dac's are known for their low jitter...
So you are saying..? Which should i go for...?
Sorry, i'm very noob with these things
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Old 21st October 2013, 12:09 AM   #4
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You asked for comparison of AD1955 with WM8740 - those are the DAC chips, not whole DAC designs. The AD1955 board will have more opamps because it lacks the on-chip opamps that the WM8740 has.

I'd say, all other things being equal, to go for the AD1955 - it has more modding opportunities. Like swapping out the OP275s....
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Old 14th November 2013, 05:27 PM   #5
regal is offline regal  United States
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Quote:
Originally Posted by abraxalito View Post
You asked for comparison of AD1955 with WM8740 - those are the DAC chips, not whole DAC designs. The AD1955 board will have more opamps because it lacks the on-chip opamps that the WM8740 has.

I'd say, all other things being equal, to go for the AD1955 - it has more modding opportunities. Like swapping out the OP275s....
But its arguable that unless you can program a standalone oversampling filter that the wolfson is better in that area. For a basic build the wolfson is so much easier to get good results.


A lot of the expensive DAC's use the AD1955 specifically so they can use a propriety difital front end. And many still prefer the AD1955 for this reason.


For a Diyer without cross tech proficiency, the wolfson is much easier to get good results.



If you a a coder and like micro-controlllers, mathcad etc, then the AD1955 is still king in my book for S-D. But those talents are few and far between.
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Old 14th November 2013, 11:14 PM   #6
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Yep - for those not turned on by modding/tweaking/designing the Wolfson is the better solution as its a one-stop shop.
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Old 15th November 2013, 03:47 AM   #7
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Am I the only one around here who thinks the WM8740 is one of the worst sounding dac chips ever made? In my view, the only way to make it sound even acceptable is to give it a deliberately colored/veiled output path(cheap lytic coupling caps, hazy 5532 post opamps) and soft power supply. Give one abundant, clean power supply & anything like a transparent output path & it's horribly metallic sounding. Choosing the AD1955 would be a no-brainer, IMO.
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