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Enjoy the Music.com Review MagazineAudiolics Anonymous Chapter 22
Mea Culpa...
Antique Sound Lab AQ 2004
Final Labs Daruma-3II and Aurios
Review By Bill Gaw

 

Antique Sound Lab AQ 2004 Tube  Spring has finally made it to New Hampshire, and I've actually spent some time out in the yard away from my equipment. Of course, not last weekend, which I spent at the Stereophile Home Entertainment Show, the report of which can be seen by clicking here. And this being New Hampshire, one day was 93 degrees Fahrenheit and the next 51 degrees, which is what makes New Hampshire interesting. At least it didn't snow.


First thing this month I have to apologize for a mis-statement from my discussion of turntable setup from Chapter 20. There, I described how I used the backside of a Classics 45 RPM release, which has no grooves on it, to adjust anti-skating for my tonearm. A reader, Richard Gordan, astutely noted that this is inappropriate for standard tangential tracking tonearms, and I agree. Happily, with my Walker Proscenium turntable with linear tracking tonearm, this works great. Thanks Richard for the correction. As I said in my last article... Trust No One, not even me.

Today I wish to discuss a product I've had for the past two months, which falls into the very high value for the money category. I was going to also review another piece this month, the Smart amplifier, but had some trouble with the first unit, which was sent back, did not receive the second unit until shortly before the Stereophile show, and therefore I'll try to do it for next month's column. 



Antique Sound Labs AQ 2004Pre-Amplifier

I first became familiar with their equipment at this year's CES, where they had two small rooms, one for display and one for playback. The equipment is made in China, probably by convict labor, ( only kidding), all primarily tube equipment on nondescript black chassis, none of them being full sized rack mount types, but rather compact and utilitarian. But there is certainly heft to them, signifying at least heavy transformers. And all were significantly less expensive for a complete system than most single pieces of high end equipment. And the sound they were getting from this really cheap stuff, was very good for CES standards, beating out many high priced rooms. This obviously intrigued me. Unhappily, they didn't understand much English, but were very gracious and let me know that they didn't have a US distributor but were certainly looking for one. 


Then, Steve R. Rochlin called me a couple of months ago to let me know that their Canadian distributor, Divergent Technologies, wanted a review done of some of their products. I jumped at the opportunity to see just how much value there was. About a week later a small package arrived at my door, looking a little bigger than the one containing three new DVD's. Opening it, I found the most compact tube preamp I've seen. It consists of a black chassis, 6x6x9 inches, weighing 2.5 Kg. with a volume control. It also offers a three position switcher, three tubes, two caps and one large input transformer protruding from the top. There are three inputs and one output per channel via gold-plated RCA's. An IEC plug for AC is used for those who enjoy experimenting with various power cables. Specs include Class A operation with a  maximum of 10 Volts output. The frequency response is claimed as 10-100,000 Hz. with a distortion of less than 0.1% at 1 volt out. Signal to noise ratio of 95 dB is also claimed. The unit uses one 12AX7 and two 12AU7's (Yugoslavia)... which surprised the hell out of me as this is a Chinese made pre-amplifier and on would feel they would include Chinese made tubes.

Opening the base, I found that it was a beautifully constructed on two Teflon circuit boards, with good but not exceptional parts including Multicaps and good grade resistors All of it was nicely soldered. 

Not expecting much I placed it in my system controlling the rear channels of my surround system. After warm-up, I turned on my EAD rear amps and heard nothing. Oh well I thought, another product broken out of the box. But I turned up the volume pot all the way and heard minimal tube rush. So at least it was working, with an amazingly low noise floor for an inexpensive product.

Then I turned the volume control, which is of the detented variety but appears to be a simple volume pot down to the first notch. An appropriate volume was found with the volume pot at about 11 o'clock at 0 gain. Surprise! Out of the box the pre-amplifier sounded very good. The channels were dead quiet and the sound was as good as I've heard from the speakers. Taught bass, clean highs, and a smooth and open mid-range.

While not up to "high-end" pre-amplifier standards, the sound was very good and I think this unit would be perfect for a budding music lover, a second system, or for your teenager. It is dead quiet, allows the emotion of the music through and has only a few faults.

First, the volume pot is ganged, thus not allowing for separate control of the channels and there is no balance control. Second, there are only 20 steps for volume that seems to give an average of 2-3 dB per step. Therefore sometimes the music was not quite at the right volume for me. This is a problem with detented volume controls, although they seem to give the feeling that they are more accurate. Third, people will laugh at the utilitarian site of it until they hear it.

I checked out the tubes on my Kaye Audio Labs small tube tester and found all three to be the best reading 12ax7 and 12au7 tubes I've measured... including my stash of British mil-spec types! These things produce the lowest noise measurements I have seen. Now I can understand why they are used in this pre-amplifier over the typical Chinese brands. There was almost no reading for residual noise and after warm-up, no tinkles, whistles, groans, etc. I have been using them every night for two months now and they still measure the same.

Now for the best part. Price. Total price is a crushing $299 plus about $20 shipping. How's that for a deal! I wrote the distributor asking how they get such quality for so little price. His answer? All of their products and parts are made in the same factory in China... chassis, knobs, electronics, transformers, etc.. This provides the same scale of savings that the large corporations use for their low end equipment, and that they use for their best. Of course at $0.20 per hour for labor, there is a slight production savings also.

Antique Sound Labs also produces higher priced pre-amplifiers and amplifiers. After hearing this beauty I'd love to review some of their better products. Go to their web site and take a look. You certainly can't go wrong for the price!

 

Enter Daruma-3II

Way back in Chapter XI I had discussed the Daruma 3-II feet, which are two metal cups, one with a depression, separated by a steel ball bearing, which work very well under mechanical equipment ,like CD transports and turntables, for isolation. Problem was, there was no known distributor for them in the USA. Well now there is. Venus Hi-Fi out of Indiana! You can reach them through their e-mail address at info@venushifi.com  and buy these for only $99 per set plus shipping.

I have come up with a new use for them though. Under your smaller speakers. At the Stereophile show, I saw a similar but larger product called Aurios Speaker Feet, which sell for 6 for $1000. These are much more elaborate than the Daruma's, and support significantly more weight, and are made specifically for loud speakers. It seems counterintuitive that feet that are made to allow speakers to move, and decouple from the floor, should work better than spikes, but at the Show, this room had the best sound, with especially tight deep bass, so I don't think the Aurios degraded it.

Not being able to use the Darumas with my bass horns, I decided to experiment by using them under my mid-tweeter round horns, and guess what. They didn't tighten the bass, which was intuitive, but they certainly did tighten up somewhat the mid range. Roy Orbison's voice could now be heard to come from a mike separate from all of the background, which, while probably more accurate that the diffuse sound I had heard previously, somewhat distracted from the illusion. But on single mic'ed, Blumlein, etc., recording, there was a definite improvement in tightness of the soundstage, especially in the center where sounds of individual instruments are normally diffuse. If you can find some Aurios for larger speakers, or the Daruma's for bookshelf types, try them. How do they work at tightening up the imaging when they theoretically should be allowing the speakers to move and thus cause Doppler aberrations, I don't know. Like so much in audio, this finding's cause is still unknown. But I do hear it.

That's it for today. Until next month, and my 24th column, Adios.

 

Specifications

Antique Sound Labs AQ-2004

Gain
Maximum output
Frequency response at 1V
Frequency response @ full power
Distortion at 1V
Distortion at full power
S/N Ratio / Noise level
S/N Ratio with A weighting
Input impedance
Power cord - Detachable /Fixed
Input Sockets
Output Terminal
Chassis Finish
Front Panel Finish 
Tube Complement
Dimension WxD xH in mm
Shipping Dimension WxDxH in mm
Net Weight
Shipping Weight

3.2
10V
10Hz - 100KHz
10Hz - 50KHz
< 0.1%
< 0.3%
mV 83 db /0.8mV
95 db (0.03mV)
100K
Detachable
RCA Gold Plate
RCA Gold Plate
Aluminum, Gold, Silver or Black Anodizing

12AX7 x 1,12AU7 x 2
160 x 230 x 160
210 x 270 x 195
2.5Kg
3Kg

 

Canadian/USA Distributor:

Divergent Technologies
342 Frederick Street
Kitchener, Ontario
N2H 2N9
Canada

Voice: (519) 749 1565
Fax: (519) 749 2863
Website: http://www.divertech.com
E-mail: divergent@divertech.com

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

     
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