Dynaco QD-2 Preamplifiers

4.11/5 (9 Reviews) MSRP : $140.00


Product Description

Surround Sound Processor (Hafler Matrix)


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Reviews 1 - 5 (9 Reviews Total) | Next 15

User Reviews

Overall Rating:5
Value Rating:5
Submitted by vrsola a Audio Enthusiast

Date Reviewed: April 27, 2002

Bottom Line:   
The home theater system is more enjoyable either with 2 channels Stereo or using a 5 channel passive Dynaco QD2 surround processor(dynaco.com). Without chip processing, there is no muffling of the sound, taking away any part of the musical spectrum.
Now watching DVD movies and television and listening to music is more enjoyable with full spectrum of clean, dynamic sound to all 5 channels including rear surrounds-
Dynaco QD2 surround processor ($37) cheaper than many cables and widens the sound stage, better than a simple stereo , natural with signal accuracy as there is no degrading by DSP chips.

Its separation is not as exciting as a Dolby for movies to which we are all attracted by the front to rear steering as in Gun shots, car chases aeroplanes flying over head, etc as we hear from Dolby encoded discs. One of the reviewers in Audio review.com suggested that it can be corrected by connecting rear out put from QD2 to the front speakers and the front speaker out puts from QD2 to the rear speakers.I tried that.It is lot better-except there is no front to rear steering of sound as we hear from Dolby encoded discs.
I used it with one AVA OmegaStar 240 2 channel amplifier and it is more than adequate in powering all the 5 speakers.It mmakes television more enjoyable.
It is good for Music at moderate listening volumes, at very low volume listening there is no widening of the sound stage as the sound out put from the surround speakers is minimal.
Still there are few available.Thanks to all the past reviewers

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Used product for:   1 to 3 months

Duration Product Used:   Audio Enthusiast

Product model year:   1997

Price Paid:    $37.00

Purchased At:   Dynaco.com website



Overall Rating:1
Value Rating:1
Submitted by mike a Audio Enthusiast

Date Reviewed: July 30, 2001

Bottom Line:   
I can't believe they are still selling this thing - mine came free (built-in) in a Dynakit 40wpc stereo amp for which I paid 80 bucks. Old audio magazines have instructions on
how to build "quadaptors" for a buck or two. The "sound" is
completely unpredictable as it depends on out-of-phase
content in the stereo mix. The effect varies from non-existent to bizarre. You can be that the engineer that
mixed the recording did not expect to have it "processed"
with one of these things.

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Used product for:   3 months to 1 year

Duration Product Used:   Audio Enthusiast

Product model year:   Pre 1995

Purchased At:   can't even remember



Overall Rating:5
Value Rating:5
Submitted by jose a Audio Enthusiast

Date Reviewed: October 11, 2000

Bottom Line:   
I took AE's advice, and I purchased one of these from the Panor Corporation. I took a close look at this metallic-looking box, and I smiled. This was a respectable-looking piece of machinery. It has some fine looking circuitery inside. On the outside it contains hi-quality binding posts. I have hardly seen anything like this from high-end companies. Anyway, I couldn't wait to hear this thing. I won't bore anybody with the installment. It isn't difficult.
On the opposite outside end are some control knobs. They are for surround volume control and other assorted goodies, such as, a contour position that gives the effect of a pro-logic delay. It is rather cool. Keep in mind this is not anywhere close to a prologic system. It is better. I didn't beleive this until I heard this for myself.
This is a Hafler designed-matrix processor (not to be confused with pro-logic processing,this does not operate with electrical power, either). It does exactly what a pro-logic system does except there is no algorithmic processing. What I heard was a wide stereo signal in both the front and the rear speakers. I got the affect of a THX system like another reviewer had mentioned. This is no joke. I am really impressed at how the Hafler matrix works. One main difference from a pro-logic system is that there is a setting that provides a full frequency to all the channels. I have a rather large room, and the effect is outstanding.
I used Saving Private Ryan for a test. I compared my father-in-laws' DTS receiver to the QD-2, and the only difference I heard was the dynamic range from the higher data rates that steer a DTS system. This difference was a louder volume level. The matrix soundtrack the QD-2 produced was so fast that I could not tell a difference as far as the extractions it produced. I am not saying it is better than the DTS system. However, it produced a dynamic soundtrack not much different from the DTS system. One other important note: I will not go back to pro-logic. Pro-logic tends to clutter up in the center channel. It is irritating especially when I am watching satellite programs. The QD-2 (or the Hafler Matrix) produces such a natural stereo effect that I do not get those irritating fallacies that my pro-logic unit produced. I am probably going to purchase a new receiver, soon, due to the 7.1 systems that are being produced. I am happy with the QD-2, and I may not replace it. Everything it does is quite better than some receivers I have heard. I thought I would never hear myself saying this. It is a cool toy. I would advise many of you to hear one for yourself. It really is an excellent decoder.
I have a full-blown home theater system. It includes Monster THX cables, pins and banana plugs,Toshiba hardware, Sony hardware, Yamaha hardware, Pioneer Elite hardware, Adcom hardware, JBL and Paradigm speakers, a satellite system, and it is all held together by Panamax surge protection. The QD-2 is highly recommended.



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Used product for:   3 months to 1 year

Duration Product Used:   Audio Enthusiast

Product model year:   Pre 1995

Price Paid:    $109.00

Purchased At:   Panor Corporation



Overall Rating:5
Value Rating:5
Submitted by AE a Audio Enthusiast

Date Reviewed: January 14, 2000

Bottom Line:   
For those of you who think this is a peice of junk: there is something wrong with your sense of applied sound. This is not intended to process anything, which is the problem with pro-logic, DD, and even DTS receivers. The stereo extractions are incredible. I have not even mentioned the surround extractions. I own a pair of Paradigm ADP's. They can produce very low bass signals. When I listen to Backdraft or Apollo 13 it is hard to beleive what I am hearing. It is a naturally-extracted "stereophonic"(I like this word) signal not produced by a processor of any type. Besides that, I am in the process of purchasing another one strictly for my rear channels which will include a full center signal. This is costing me under two-hundred dollars. This did not take a rocket scientist to figure out as long as you have the right components. Hafler knew what he was doing when he designed this thing. Maybe you guys don't own the right type of speakers. Who knows.

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Used product for:   3 months to 1 year

Duration Product Used:   Audio Enthusiast

Product model year:   1995



Overall Rating:5
Value Rating:5
Submitted by GEORGE GRAND a Audio Enthusiast

Date Reviewed: January 1, 2000

Bottom Line:   
This is the best $25 you can spend in audio/home theater. I have a real he-man rig as my main listening system. I use no surround sound in that system. But for my home theater set-up in the new addition, I pressed one of these little jewels into service with astonishing results. Go ahead and spend a bundle on home theater if you want, but you owe it to yourself to see what you can derive from your present amp, and a modest pair of surround speakers. As an aside, you can now get one of these delivered to you door for under $25!!!!! Here is where; J & R Music World in New York City. Very reputable company! Telephone is 1-800-221-8180. Tell them you want a Dynaco Quadaptor. You wont regret it.

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Used product for:   More than 1 year

Duration Product Used:   Audio Enthusiast

Product model year:   1998




Reviews 1 - 5 (9 Reviews Total) | Next 15

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