$vboptions[bbtitle]   $vboptions[bbtitle]  
  Terms and Conditions     Project Showcase
  Resource Index   Speaker Terms Glossary
  Security/Privacy   Speaker Replacement Help
Results 1 to 7 of 7
  1. #1
    Join Date
    Jul 2012
    Location
    Saint Francis, MN
    Posts
    71

    Default Class-T Amplifier sound quality?

    Hi I'm looking for opinions on the sound quality of the higher power Class-T amplifiers like the TA2022 and TA3020. I have the Dayton DTA-1 (TA2024) and the Dayton DTA-100 (TK2050). But I would like to have something with more power in the speakers I'm planning to Bi-amplify with an active crossover. How does the sound quality compare against good quality comparable power output (60-100w/Ch 8ohms) Class AB amplifiers. From many reviews I have read on some of these amps like the Topping TP60 (TA2022) is that Class AB may be becoming an obsolete technology?
    Thanks in advance for your opinions
    Shawn

  2. #2
    Join Date
    Oct 2011
    Location
    Tulsa, OK
    Posts
    3,240

    Default Re: Class-T Amplifier sound quality?

    You're taking a limited sample and stretching your conclusions too far. Class T and Class D amps have come a very long way, but as the power levels increase, so do their inherent shortcomings. It's possible to overcome most all of these shortcomings, but cost-wise, it becomes cheaper to return to Class AB1 or especially Class AB2 amps when the power levels start exceeding 100 watts RMS per channel. Even though the power supply may become (often is) more expensive than the actual amplifier for Class AB2 and more so for Class AB1, the "support circuitry" for high power Class T and D amps can cost more than the savings of Class ABx amps. There's always the exception to the rule, of course, and I don't want to over generalize. For "popularly priced" stereo gear, this is a decent "rule of sore thumb". Just like in gas powered "daily driver" cars you're usually money, maintenance, effort ahead with a larger 4, than with a high-strung half-displacement turboed 4, for now. "No replacement for displacement." We are getting much closer to the "break-even" point on amps and engines, and that's a crude analogy. Several very well respected stereo companies still stake their bread-and-butter on very carefully designed super low distortion Class AB amps, and will for years to come. It's hard to argue with their results.

  3. #3

    Default Re: Class-T Amplifier sound quality?

    I have had my Topping TP60 for three months and I'm very pleased with its sound quality. It is a serious amp and yields excellent results for speakers which have moderate sensitivity (mid to upper 80's SPLs). I never turn up the volume knob beyond 2/3ths to 3/4rd position for my 4 ohms MTM speakers. Do not believe the 80/50 watts per channel rating at 4/8 ohms load as that is at 10% distortion. Do believe 48/27 watts at 4/8 ohms at less than 0.1% distortion. After operating for hours the case is cool to the touch! My only caution is to not drop it on your foot as it is seriously heavy for its small size.

  4. #4
    Join Date
    Dec 2011
    Location
    Deer Park
    Posts
    881

    Default Re: Class-T Amplifier sound quality?

    Since all my class T amps (DTA-100a) (lepai) were purchased for a fraction of the normal price ($4, $6, $15).... They carry an amazing value

    That aside, the used market on standard audio gear still dominates in terms of value. You can pick up really good old amps for $20-50

  5. #5
    Join Date
    Jul 2012
    Location
    Saint Francis, MN
    Posts
    71

    Default Re: Class-T Amplifier sound quality?

    Thanks Whitneyville1 & Jim, Sidi for your opinions.
    I have never heard of Class AB1/AB2, is the difference between the two the amount of bias current? (one being closer to Class A). I have seen that most subwoofer plate amps are Class D - is this because the the difference in performance at low frequencies is less audable? Could a Class D amplifier have audiophile quality if it only amplified the 30-300Hz range in a bi-amplified speaker? And use a AB amp for the 300Hz-20kHz range.

  6. #6
    Join Date
    Mar 2010
    Location
    Europe
    Posts
    455

    Default Re: Class-T Amplifier sound quality?

    Quote Originally Posted by Shawn_K View Post
    I have seen that most subwoofer plate amps are Class D - is this because the the difference in performance at low frequencies is less audable? Could a Class D amplifier have audiophile quality if it only amplified the 30-300Hz range in a bi-amplified speaker? And use a AB amp for the 300Hz-20kHz range.
    I am slightly unsure what you mean by audiophile sound quality. To an engineer an amplifier should have no sound of its own, that is, it should sound neutral. But to many audiophiles valve amplifiers, for example, that are not audibly neutral are often described as having a high sound quality whereas audibly neutral amplifiers (in the sense of blind tests) are not.

    Class D amplifiers can cheaply and efficiently supply lots of power at low frequencies which are often needed for bass drivers in small sealed cabinets. One of the downsides of class D is that it is relatively difficult to maintain audibly neutral performance at high audio frequencies. Class AB is less efficient than class D and more expensive to make work at the high powers often required by bass drivers in small sealed cabinets. It has less issues in being audibly neutral at high frequencies for the more modest power requirements of mid and tweeter drivers.

    A class D module for bass and class AB module for mid and high frequencies would be a reasonable thing to do.

  7. #7
    Join Date
    Oct 2011
    Location
    Tulsa, OK
    Posts
    3,240

    Default Re: Class-T Amplifier sound quality?

    Class AB1 and Class AB2 mostly differ (in tube amps) by the amount of bias current used. In solid-state amps, it's mostly in the amount of negative feedback applied to prevent self-oscillation and rising THD. Personally, don't really don't like the "sound" of lots of negative feedback in an amp. While it reduces the THD, to my ear, it also "squeezes", or take the fullness from the music. Certain brands of amps are known for their lack of negative feedback (NAD, Harmon-Kardon, Carver, and some more).
    A Class AB2 amp is a little more efficient in terms of watts output vs: power in watts input. With computer aided design, and other "smarts" available today, it's VERY hard to hear any difference in AB1 or AB2 in a good solid-state amp. Several people on the forum are using tube pre-amps and Class D power amps with outstanding results. There are reasons this should work well. One of the mid- late 1970's 70 lb. Sansui intergrated amps or receivers (150-175 WPC) are GREAT power amps to this day, and command top dollar on audio sites like Audiogon and other used audio gear sales sites. Most guys change the hot dial lights out to LEDs and replace the old control pots and clean the switches, and they are ready to Rock and Roll for another half-Century.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  




Your #1 Source for Audio, Video & Speaker Building Components


Clearance Center
Deal of the Day
New Products




View Our latest
Sales Flyer

Prices Effective
Through 8/31/14


Order our FREE 336 Page Full Color Catalog


Speaker Component Categories

Home Audio Speakers

Professional Audio & Guitar Speakers

Car Audio Speakers

Speaker Buyouts

Measurement & Design Tools

Subwoofer Plate Amplifiers

Full-Range Plate Amplifiers

Crossover Components

Cabinet Hardware & Speaker
Grill Cloth

Speaker Cabinets

Subwoofer System Kits

Speaker Kits

Speaker Repair Parts

Speaker Wire