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I've used AA DTI v2.0, DTI Pro32, SF Ultra Jitterbug, Theta TLC. My preference is the two AA products. I use them for clean up of PCM, DD, and DTS signals. The sonic difference in my system between full jitter reduction and none is colossal -- I can't imagine having to listen without it.
I have had excellant results with the AA DTI-Pro 32 and the Genesis Digital Lens. The Lens is my favorite and does feature balanced capability. It also shows speed accuracy of the transport. I have found all these devices to be system dependent, so try to get a return option on anything you try. They can make major improvements, so they're worth checking out.
The Ultrajitterbug is one of the worst I have heard - definitely try before you buy. Part of the reason for less popularity is that the standards changes upset things and the DACs are getting better.
I am partial to the Genesis Digital Lens (Why don't they shorten this name to the "Genital" ;>)). It sounds great with my Theta transport and processor and also has five inputs - AES/EBU, BNC, Coaxial, ATT Optical and Trashlink. This pretty much covers you for whatever you buy in the future.
I have an AA DTI Pro and DTI 2.0 and my experiences are in line with what's above. I do not understand why these things have not been more popular but would guess it's because it requires another electrical outlet and digital cable. I have tried several different transports and dac's with and w/o the dti and have always preferred the sound with the dti in the system. I have not tried the DTI pro 32, but the DTI pro is much better than the DTI 2.0, even with its resolution enhancement set at 16 bits.
Valium and Jim Beam, together.
I also use a Genesis Digital Lens with a Theta ProGen Va DAC and Theta Data Basic with great results. I use balanced digital cables exclusively. Wouldn't be without the Lens.
Check out the JISCO if you can afford it. Once you hear it, you won't want to part with it.....music sounds clearer and much less "grainy". Here is a very good review which I can confirm through my own listening. I'm using it with my Pioneer Elite PD65 and Monarchy 22C DAC.
If you check MonarchyAudio's web site they have reviews of their DIP. One of the reviews is very interesting in that actual tests were run on the DIP, AA, SF and a few others. In the end, only the DIP actually reduced jitter. The rest didn't hold a candle to it. Problem is, it has balanced out but not in.
The Meridian 518 would certainly have to be
considered as one of the best at jitter reduction
plus it does word length manipulation, dither, gain
I would also recommend the Meridian 518. Regards, Richard.
Short of a closed loop system such as Denon's genlock, or Wadia's equivalent [wadia know?]; or UltraAnalog's I squared s interface used by Sonic Frontiers et al, a Genesis Digital Lens. Typically priced in the $600s on/in Audiogon.
Would only be speculating as to why less popular now...
I have a Genesis Digital lens and although it makes it sound a LOT better it also creats a lot of popping. Genesis doesnt answer my emails and I had no choice but to stop useing it. When my aggravation calms down a bit I will experiment with different digital cables.
I have a Genesis Lens that pops and crackles and is otherwise needful of repair. I have another that works perfectly. I speculate the phase lock loop is failing to lock properly, but that's only a guess. I suppose a ground problem could also cause misbehavior, possibly differing grounds for the transport, lens, or DAC, or perhaps a break in the digital cable ground.
I follow the Lens with a couple DTI Pro32 boxes to get even further jitter reduction plus 24 bit successive approximation interpolation. I guess it's kind of extreme, but with a well recorded and mastered CD, the result can be pretty awesome.
Trevor: How much of difference to you get by adding the two DTI Pro 32 boxes. Would say it is twice as good then the lens by itself, 50% bretter, or 25% better?
That's a realy tough question. I've heard that the transport contributes 1/3 of CD playback quality and the DAC contributes the last 2/3 (I guess we are to presume the cable is a non-issue -- wish that were the case in my system). I'm afraid I am totally unable to carve up the contributions that way. All I can say, is that the Lens alone (with appropriate dither setting) is hugely superior
to no lens in my rig (regardless of AA jitter boxes). Though even then, I can reliably hear differences depending on the transport I connect.
I can't be sure the additional jitter filtering of the AA boxes actually accomplishes anything when the Lens is present (except in LD mode), but the real gain comes from the 16bit to 24bit interpolation. A single Pro32 takes the sound a significant step closer to analog. A second Pro32 takes a further step, though perhaps best described as a desirable refinement. We are definitely talking diminishing returns, but the sonic improvement is easily recognizable with a clean CD source (too bad they can be hard to identify). Naturally, cabling is also an issue since jitter can be re-introduced and negate the sought after gains.
So, I would say the primary benefit is probably jitter reduction via the Lens, a major secondary benefit is 16 to 24 bit interpolation with the first Pro32, and a worthwhile incremental refinement from the second Pro32 (at least -- in my system).
It should be noted that jitter reduction and word length interpolation are two completely different things, so although people tend to view the Lens and Pro32 as an either/or proposition, that is not correct in terms of their functionality. Hope I at least kind-of answered your question.
I've been very pleased with the Camelot Technologies Dragon 5.1 antijitter filter. It's compatible with a number of digital formats including DTS as well as redbook. A little pricey at a retail of $500, but I noticed a remarkable improvement to all my digital sources when connected. One criticism, no balanced capability, but the single-ended really doesn't sound bad at all, IMHO.