Class T amplifiers
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=33680
Printed Date: November 04, 2025 at 8:01 AM
Topic: Class T amplifiers
Posted By: thapimpfromchi
Subject: Class T amplifiers
Date Posted: June 11, 2004 at 9:23 AM
The new thing on the block is Class T digital amplifiers. Tripath. Supposed to be ultra efficient. It's used in my head unit, works great, but wondering how much power they draw (amperage): using these specs for example: Frequency Response 20 Hz – 20 kHz
S/N Ratio >95dB
THD: 0.02% all channels driven
250mv - 2.5 V Low level Input Voltage
500mV - 5V High Level Input Voltage
250W x 2 @ 4 Ohm Stereo
450W x 2 @ 2 Ohm Stereo
750W x 2 @ 1 Ohm Stereo
2000W x 1 @ 2 Ohm Mono
Dimensions: 2.5"H x 8.5”W x 15.25"L Those are the specs for a Class T amp. MA Audio. Model H2K-TP. Thanks. ------------- 1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp
Replies:
Posted By: DYohn
Date Posted: June 11, 2004 at 9:39 AM
Tripath amps are still somewhat an unknown quantity, although some of the material I've read looks really promising. I have a H2K-T amp on my workbench now and hope to have the testing done soon. I'll at least let everyon know if the specs are real after I get the report. ------------- Support the12volt.com
Posted By: thapimpfromchi
Date Posted: June 11, 2004 at 9:41 AM
great man, i'll be looking forward to seeing what the almighty DY has to say. lol.
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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp
Posted By: Steven Kephart
Date Posted: June 11, 2004 at 11:10 AM
My Arc amp uses a Tripath chip. From what I understand, they are very similar to class D. In other words, they are very efficient at lower power levels, but at full power efficiency drops down to A/B range. They are also much more expensive to impliment. You say your head unit has a Tripath chip in it? They are kinda large, and really not needed in head unit's, so that is surprising. What head unit do you have? Steven Kephart Adire Audio -------------
Posted By: fuseblower
Date Posted: June 11, 2004 at 11:15 AM
Posted By: customsuburb
Date Posted: June 11, 2004 at 11:31 AM
I beleive Panasonic has one in one of their higher-end cd players.
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Posted By: Sweekster
Date Posted: June 11, 2004 at 11:46 AM
Here'sPanasonic's new head that uses an internal Class T. 60 watts rms. ------------- Duane...
If you think you're confused, imagine how you feel. 
Posted By: DYohn
Date Posted: June 11, 2004 at 1:36 PM
Preliminary test results on MA Audio H2K Class T amplifier: Maximum bridged output before clipping @ 12.5 volt input: 62.7 volts @ 2.5% THD 20-20KHz (measured into an 8-ohm reactive load) This correcponds to 1965.6 watts into 2-ohms bridged. Maximum output at <10% THD: 80.7 volts. Damping factor 20-20KHz into 8-ohms reactive: 46. DIN power @ 1KHz, 1%THD into 8-ohms reactive: 76.5 volts. THD from 20-20KHz @ 28.3 volt output: 0.2% S/N ratio (IHF A) 20-20KHz <0.2% THD: -88db. Frequency response +/- 1db: 18 Hz to 35KHz. There is significant measureable high frequency noise above 35kHz extending up to 150KHz. Switching noise is present and audible at startup, measured at 46db. IMD from 20-1KHz is <0.1%, 1KHz to 20Khz is 0.25% @ 28.3 volt output. Overall power efficiency: 63% Distortion numbers in general increase at higher frequencies much faster than at lower frequencies as power output increases. This looks like a decent amp for subs, but probably not for mains. ------------- Support the12volt.com
Posted By: thapimpfromchi
Date Posted: June 11, 2004 at 3:06 PM
yea, custom is right. Its the panasonic. CQ-C9800U. Unbelievable power, and sound man. best 425 i've ever spent. :)
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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp
Posted By: thapimpfromchi
Date Posted: June 11, 2004 at 3:08 PM
thanks for the reply there DY. I was hoping they are efficient. I can get those MA amps for dirt cheap. THanks.
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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp
Posted By: Ravendarat
Date Posted: June 11, 2004 at 9:30 PM
I used to sell the Orion Cobalt 250.1T and that thing was a sweet amp but super expensive at a retail of 799.99 for a 250 watt amp. Sounded awsome though and ran all day all night on my demo board with no problems.
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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
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