Review: Bent Audio Tap Linestage


Category: Preamps

Before, I get to the details of reviewing the Bent Audio Tap Linestage, I first would like to give a context regarding what my linestage reference of the last three years has been in order to "set the stage" so this review would be the most helpful to the members reading it.

My reference over the last three years has been the Placette Audio Dual Mono Active Linestage. It replaced a ML-32 reference preamp in my system. I had auditioned six different preamps/linestages, half were tubed - half were solid state ranging in price from $6000.00 to $16000.00, until I finally heard the Placette Active in my system and found what I was looking for sonically. It offered, compared with the other pieces in my home auditions, the following sonic virtues:

1) No noise floor at all. Music just "floated" out of a totally black background.
2) A great soundstage, front to back - side to side, with the best center fill and layering I ever had in my system.
3) Precise microdynamics and details without being what I would call "dry" or "etched" at all.
4) Excellent extension on both the top and bottom with great slam in the lower bass.
5) Natural tone/timbres, very important to me because I listen almost totally to acoustic jazz.

Not bad stuff! However, being the curious audiophile that I am, I had read about a few new linestages that had come out the last couple of years and decided to listen to what some of the best designers were up to now. This time around I auditioned a highly regarded solid state,tubed, and transformer based units. Even though the solid state ant tubed pieces were almost twice as expensive as my Placette, and they have their virtues, I did not find them to better the Placette in the above mentioned areas. Different but not better for my ear's and personnal taste.

That's the context, now on to the review. The Bent Tap Linestage is the child of John Chapman and his company Bent Audio out of Canada. I would like to share John is one of the great gentleman/designers of high end gear and is a true pleasure to talk and to do business with. His pieces are purchased direct, with a 30 day trail period with full refund if one is completely not satisfied.

At this point in time there has been a full review on the Tap Linestage on POSTITIVE FEEDBACK ONLINE website by Bruce Kinch and on SIX MOONS website there is what they call a "pre-view", along with one of SIX MOONS reviewers, Les Turoczi, who considers the Tap Linestage one of the "favorite discoveries of 2006" and has made it his new reference linestage in his system.

The above mentioned reviews, along with information on the Bent Audio website, will provide excellent background information on the topic of passive preamps/linestages and specificly on the issue of transformer based passives compared to Vishay resister based approachs. By the way, the Placette Active is a Buffered Vishay based passive linestage that gives no gain, but eliminates any concerns with impedance matching the front end with the down stream amps.

I never get into lengthy details regarding engineering or parts, that is all provided by the Bent Audio website, however I always comment on build quality and looks before I get to the the most important part the sonic performance. The Tap Linestage has a "cool modern" look to it, but it will never be the "eye candy" that my Pass Labs or Accustic Arts pieces are to me. The front has angled sides and sits atop a 1" slab of clear acrylic which has been routed out to securely mount the twin transformers. Inside high quality Arlon circuit boards, ribbon cables, and custom OCC copper wire sourced from Neotech speak highly of the construction of this piece.

Now, to the most important part of any review, the sonic performance of the piece being evaluated. In the following areas the Tap and PLacette active were, at least for me in my system, indistinguishable:
1) Total black background, no noise floor, music just "oozes" out of the system.
2) Both provide the best soundstage and layering of any linestage I have ever had in my system.
3)Macrodynamics are present and powerful, but intergrated in the overall "fabric" of the music.

Were the two linestages start to part sonic company is revolving around to key sonic areas, tone/timbres and image density of players in the sound stage.

I find that the Tap to be slightly "warmer/fuller" then the Placette Active in overall timbres, what many listeners would refer to as the "magic of tubes", mind you, not "fat/euphonic" but more "velvety" then the "silkyness" of the Placette. It reminded me when I went from an Edge NL-10 to a pair of Pass Labs XA-100's, both great amps, but I found the XA-100's to be subtly more what I call "organic/musical". Another verbal stab at it would be to say that the Placette Active has "razor sharp" leading edges and the Tap is a little more "rounded off" but has more body and decay then the Placette Active.
The Placette Active never sounds "etched, dry, or overly analytical, but a little less "sweet" then the Tap. They both offer beautiful sonic pictures and what you would like would be very much decided by your personnal taste and what type of system synergy you would end up with in your rig.

The other sonic difference that I noticed was in the area of image density. The Tap kicked it up a notch in comparsion to the Placette Active regarding the density of images, not the size or air around the individual players, but how "real" they sounded in the stage. Again, both linestages are quite terrific regading this sonic aspect, but the Tap gives more in this area then the Placette Active.

So, is there a winner or loser between this linestages, I don't think so, there both reference level in their performance. As I always say at this level of gear it comes down to personnal taste and system synergy. There's always very small but real differences in gear, but the final voicing of any system finally comes done to matching this tiny sonic bits together to get what we are listening for in the pleasure of the music we care about.

The Bent Tap is my new reference linestage for the reasons stated above. Both the Tap and Placette Active are great performers, terrific bargains for what they sell for, the Tap $3000.00, the Placette Active $5000.00, when you think they compete with any linestage on the market today and both John Chapman and Guy Hammel are great gentleman to work with, you might put both on your audition list if your seeking out a new linestage. Which one you would like better truly would come down to personnal taste/system synergy, so really won't know till your try it in the context of your own rig.
teajay
Dbld, John Chapman, just like Guy Hammel of Placette, allows a 30 day home audition period to see if the Tap will work in your system and give the sonic signature your looking for.
Gmood1, just wanted to share that the information regarding the type of wire that John Chapman uses in the Tap's transformers is not the stock wire of the standard Stevens&Billington transformers, is correct on my part.

John uses a special OCC copper wire(oxygen-free coninuous cast)that he believes offers more of a "natural/musical" sonic perspective then the standard/stock wire of the off the shelve S&B transformers.

So, does this different wire make a "real" sonic change, I don't know, however John Chapman had shared with me that he did experiement with silver wire, and different copper wires and found the OCC to sound the best to his ear's and taste.
Great review Teajay. I have gone thru both the preamps and have Bent Noh (earlier version of TAP). Placette Active and Bent comparison was a preference than a performance issue...I thought both were so close and excellent (you change interconnects and you can extract different sonics). I kept Bent since it offered better value :).

I have been itching to get TAP with addnl 6 Ch input & well reviewed Dodd battery pre.

Cheers,
Kishore
Thanks for the info Teajay. What ever he does or S&B does..the sound is darn good with the Bent's! If it weren't for already owning two TVCs I would be lusting after the Bent.;-)
Chances are.. I'm done buying preamps for a looong time. Although those trannies out of Thailand do look interesting.

Good listening and enjoy the TVC!
Just wanted to share as the Bent burns in the sonic virtues I mentioned in the review, such as microdynamics, tonal vividness/image density, and macrodynamics have just gotten better as the hours go by. I would also add to this list rhythmic drive, my whole system just seems more "alive", but without edge or glare of any kind.

I have also become aware of something unique regarding the noise floor or "blackness" that the Tap offers that my old reference linestage did not. Both have no noise floor as far as I can tell in my system. Each floats the music out of total and complete silence, yet something was different which made the overall sonic picture more "pure/real" to my ear's. Well, I came across an older review of another Stevens and Billington transformer based passive, the AVTAC Pasiphae which is no longer in production by Ross Mantle writing for Ultra Audio website. He beautifully describes what I'm hearing, so I quote:

"This transformer based preamp retains all low-level information down to the threshold of hearing, with no artificial blackness to the background. As the unit is passive, it generates no noise of its own. The result is that you can hear the atmosphere of the hall even when the music is not playing. The transients never pop out of nowhere. Rather, they develop and decay in a natural, believable way without being cut off abruptly when they reach the noise floor. At the same time, the superb low-level retrieval results in rich details at all levels.

In his Preamplifier Cookbook, Allan Wright of Vacuum State Electronics coined the term downward dynamic range. According to Wright, downward dynamic range is one of those qualities that separate the preamp men from the preamp boys. I believe it. Another term that nicely sums up these effects would be Harry Pearson's continuousness, which the Pasiphae has in spades. To resort to a tired but apt comparison, the organic effect of the Pasiphae gave CDs a sense of the pleasant continuousness and wholeness associated with vinyl records."

Mr. Mantle really "nails" what I have been experiencing with the Bent, but struggling to put into words.