Question about Peavey AMPLIFIER, 1000 WPC, DDT, 8/4/2 OHMS => Model PV2000 Car Audio Amplifier

Open Question

Class D audio amp channel hums, also distorts at low volumes

Hello gents,

I have a 100 watt per-side stereo combo keyboard amp. Output stage is Class D switching audio.

SFX-100 from Groove Tubes manufacturer. It uses cross-fire phased stereo imaging, dipole speaker arrangement and electronics phasing, but don't think that part of circuit is part of the problem.

The crossfire speaker always emits a 120 Hz buzz. Not excessively loud, but not present in the forward speaker. From what I understand, properly working units don't exhibit this.

The cross-fire channel distorts at all but the most quiet of input signals, the forward channel is nice and clear. The distortion sound is ... somewhat ''papery,'' it's not the clipping type distortion, more reminiscent of a very coldly biased class AB amp.

Do these symptoms ring any bells for a Class D amp? Anything I should start right away with? The manufacturer has turned ops over to Fender Musical Instruments, who are currently flummoxed as to handling service calls, requests for schematics, etc.

Have o-scope, meters, iron, etc., and pretty decent analog debug and fix skills.

THANK YOU FOR YOUR HELP!

- Carl Berger





Posted by on

2 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

leorcid
  • 281 Answers

SOURCE: Buzzing bass Amp combo

The problem you have mentioned is a common one with old sets, but it also occurs in new ones also, though not frequent. You can fix this just by changing the electrolytic filter capacitors in the power supply and sub filters on the amp PCB. The new capacitors should be of the same or higher voltage rating and same capacity rating as of the existing ones. And as it is such an old one, it is better to change all the electrolytic capacitors to avoid any further problems.

Posted on Dec 19, 2007

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

What is the wattage output of the kenwood ka 728 integrated amp?


Specifications Power output: 130 watts per channel into 8? (stereo)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.007%
Input sensitivity: 0.2mV (MC), 2.5mV (MM), 150mV (line)
Signal to noise ratio: 69dB (MC), 87dB (MM), 107dB (line)
Output: 150mV (line)
Dimensions: 340 x 109 x 369mm
Weight: 9.2kg
Year: 1984
Kenwood KA 828 Manual Stereo Integrated Amplifier HiFi Engine

Nov 15, 2016 | Kenwood Audio Players & Recorders

1 Answer

How many watts per channel in a technical pro rx55uribt 1500w reciever


What is in a Watt.
Although Watt should be a dimension of power (current times Voltage) most manufactures give numbers you can't use. They always speak of maximum power. That number only can be reached in a laboratory and is measured on a clean resistor. They try the lowest resistor (not an impedance) the amplifier can work with, without blowing the end stage.
Then they put a free marge to tell you it should have a musical power of xxxx Watts. The output differs for speakers of 2 ohm, 4 ohm or 8 ohm. But there is not one speaker with an impedance over the whole audio spectrum.
Just read something over audio and power amplifiers.
The output has nothing to do with the quality of the sound. I have heard 15 Watt amplifiers perform hundred times better then some kilowatt amps.
Even if the manufacture says the amp is 1500 w it could be within legal limits and fir the amp is measured and can't deliver 100 watts of real power nobody can do a thing, because the watts could be the musical power. and that is a free invented non measurable measure. I don't even want to start over distortion, because the cheaper amps do produce more distortion, than music. If you use it for a sub woofer that is no problem, because you feel more than you hear.

Sorry for this big story and not saying what the real output is, because nowadays nobody bothers measuring amps like this.
The more serous audio magazines, will put some test about amps, and you should read one or two test to know what I mean about the worth of watts in audio.

Jul 12, 2014 | Audio Players & Recorders

1 Answer

One channel distorted on my peavey 1200 watt amp


Sounds like your output stage took a dump!

Dec 18, 2012 | Car Audio & Video

1 Answer

How many total watts does this system have


Well... It consumes 240 watts of electrical power total so take the audio power specifications with a huge grain of salt, as no audio device puts out in audio power anywhere near what it consumes in electrical power. Heat produced is power consumed, too and nothing is 100% efficient.

In the specs below the only information useful for comparison is in the line I highlighted with >>> <<<<'s as it conforms the closest to the industry standard practice of using:

"X watts into 8 ohms (standard load) from 20 - 20000 hz plus or minus Y db at no more than .0Z% distortion"

The better amps specify vanishingly low distortion specs (0.0x% vs 0.x%) at the cost of being able to claim higher wattage. But they guarantee cleaner sound at the claimed levels.

JVC is being tricky with their choice of a 40 hz lower limit. THAT is the power hungry end of the spectrum. 20 hz is normally the lower limit stated.

"Output Power .............At Stereo operation
Front channels .............55 watts per channel, min. RMS, driven into 4 ohms at 1 kHz, with no more than 0.9 % total harmonic distortion. (IEC268-3/DIN) 30 watts per channel, min. RMS, driven into 8 ohms at 1 kHz, with no more than 0.9 % total harmonic distortion. (IEC268-3/DIN)

>>>>> 30 watts per channel, min. RMS, driven into 8 ohms, 40 Hz to 20 kHz, with no more than 0.8 % total harmonic distortion. <<<<<

At Surround operation
Front channels .............50 watts per channel, min. RMS, driven into 8 ohms at 1 kHz, with no more than 0.8 % total harmonic distortion.

Center channel .............50 watts, min. RMS, driven into 8 ohms at 1 kHz, with no more than 0.8 % total harmonic distortion.

Rear channel .................50 watts, min. RMS, driven into 8 ohms at 1kHz, with no more than 0.8 % total harmonic distortion."

Mar 02, 2010 | JVC RX-554V Receiver

1 Answer

I need an owner's manuel for a Pioneer stereo power amp SPEC-4. I have a part # ARB-235. I think this amp is a product of the 1970's. Where would I be able to get my hands on the operating instructions?...


You can register with hifiengine.com andfind it and the service manual.

There really isn't a lot to a power amp to be operated. This one differs from most in that it has an input level control and VU meters.

From http://images.google.com/imgres?imgurl=http://www.incomesixdigits.com/spec4/spec4a.jpg&imgrefurl=http://www.incomesixdigits.com/spec4/&usg=__WbFLwPqHXjFHe_P2BCKyTT9CxQY=&h=652&w=1156&sz=526&hl=en&start=2&um=1&itbs=1&tbnid=5SVKh2leUGWXmM:&tbnh=85&tbnw=150&prev=/images%3Fq%3Dpioneer%2Bspec%2B4%26hl%3Den%26rlz%3D1R2ADFA_enUS360%26sa%3DX%26um%3D1


Dynamic 150 + 150 Watts Power Output, Generous High-power Design
The Spec-4 employs DC construction which excludes capacitors from the NFB circuits and uses a dual transistor differential amplifier with a current mirror circuit in the 1st stage. This provides a stable operation and also high gain over a wide frequency range. The pre-driver stage is a class A amplifier circuit with a regulated current circuit for the load. This makes for high-gain amplification with superior linearity. Furthermore, there is an overdrive limiter and power limiter circuit which is designed to protect the power transistors and make for added reliability.
The power stage employs a 3-stage Darlington pure complementary parallel SEPP circuit.
The SPEC-4 delivers Continuous Power Output of 150 watts per channel, min. RMS, at 8 ohms from 20 Hertz to 20,000 Hertz with no more than 0.01% total harmonic distortion.

Completely Independent and Perfectly Stable Left / Right Power Supplies
The mighty power supplies are completely separated for the left and right channels. Also, each channel is provided with two 22,000uF large-capacity electrolytic capacitors and large transistors with a superior regulation. They achieve outstanding channel separation and a clear, powerful reproduced sound, in addition to the wide frequency response. There is a built-in surge killer circuit to suppress inrush currents from the power transformers and high currents which charge the electrolytic capacitors. This circuit ensures that none of the parts are affected by these adverse currents.
Protective Circuits Composed of Fast-response Relays and Electronic Circuits
Each channel is protected by a DC and over current detection relay circuit. In the event of the speaker terminal shorting due to poor connections or when DC current is generated in the output, the output circuit is immediately disengaged and the speakers and transistors are safeguarded against any possible damage. The protective circuits also function as muting circuits when the power switch is turned on and off.
Peak Level Meters with Outstanding Waveform Response
This power amplifier incorporates logarithmic compression peak meters with a wide scale (-40 -+3dB). With 8-ohm speakers, they allow the output to be read out from 0.01W to 300W. Moreover, the meters feature a fast response for peak signal indication. In addition to the peak output reading, it is easy to interpret the dynamic margin with respect to the SPEC-4’s clipping level.
Input Level Controls with dB Calibration
The SPEC-4 is equipped with input level controls with direct readout attenuation values (-dB). These can be used to continuously adjust the input levels for each channel in accordance with the rated output voltage of the preamplifier. In this way, the SPEC-4 can perform the proper gain control according to the preamplifier’s output level. The preamplifier will thus be used in the condition possible for the best S-N ratio and distortion characteristics.
Stylishly Professional Front Panel Design
Just as you would expect from a sophisticated system, the SPEC-4’s front panel is professionally designed with the large level meters in the center. Also. The front panel’s dimensions allow the model to be mounted in an EIA standard rack, just like real professional-use amplifiers.
SPECIFICATIONS
ICs………………………………........................................2
Transistors………………………………...........................61
Diodes……………………………….................................62
Power Amplifier
Circuitry………………………………Current mirror loaded differential Amplifier
3 stage darlington parallel push-pull
Direct-coupled OCL. (DC amplifier construction)
Continuous Power Output of 150 watts * per channel, min. RMS, at 8 ohms from 20 Hertz to 20,000 Hertz with no more than 0.01% total harmonic distortion, or 180 watts per channel at 4 ohms from 20 Hertz to 20,000 Hertz with no more than 0.03% total harmonic distortion.
Total Harmonic Distortion (20 Hertz to 20,000 Hertz, 8 ohms)
Continuous rated power output………………………………................................0.01%
75 watts per channel power output……………………………….......................... 0.01%
1 watt per channel power output……………………………….............................0.01%
Intermodulation Distortion (50 Hertz to 7,000 Hertz = 4:1, 8 ohms)
Continuous rated power output………………………………................................0.01%
75 watts per channel power output……………………………….........................0.005%
1 watt per channel power output………………………………........................... 0.005%
Frequency Response………………………………...............5 Hertz to 100 kHertz +0/1 dB
Input (Sensitivity / impedance)……………………………............................1V/50k ohms
Output
Speaker……………………………….................................................4 ohms to 16 ohms
Damping Factor (20 Hertz to 20,000 Hertz, 8 ohms……………………………….........100
Hum and Noise (IHF, short circuited, A network………………………………........11 5dB
Miscellaneous
Power Requirements………………………………...................................AC 120V 60 Hertz
Power Consumption………………………………..........................................760 watts (UL)
Dimensions………………………………..............................480(W) x 187(H) x 445 (D)mm
18-7/8 x 7-3/8 x 17-7/16 in.

Feb 10, 2010 | Audio Players & Recorders

1 Answer

What is the watts for the cd player?


It's published rating is a measly 13 watts per channel (four channels total). That is very low for a car head unit and isn't going to drive the typical speakers this would be used with to normalr volumes without distorting. Frankly, this entry-level unit is really designed for use with external front, rear and sub amps, which is why Eclipse designed it with three sets of pre-outs. On the positive side, the line voltage level resistance on those outputs is relatively low (55 ohms), so this unit will provide a good amount of gain into a given amp.

Jan 27, 2010 | Eclipse CD3422 CD Player

2 Answers

How many watts is this amp


Specifications Power Output: 100 Watts RMS x 2 channels at 4 Ohms ≤ 1% THD+N Signal-to-Noise Ratio: 80 dBA (reference: 1 W output) Additional Power Output: 200 Watts RMS x 2 channels at 2 Ohms ≤ 1% THD+N
400 Watts RMS x 1 channel bridged at 4 Ohms ≤ 1% THD+N THD+N (Distortion): <0.25% (reference: 1 W output) Frequency Response: 20 Hz to 20 kHz (-3dB) Maximum Input Signal: 5V Maximum Sensitivity: 100mV Dimensions: 14.37 x 9.72 x 2.5 (365mm x 247mm x 63.5mm)

Jan 03, 2010 | MTX 4002 Car Audio Amplifier

1 Answer

The subs aren't pushing out bass.


Hello crobins2,

The Kenwood KAC-6202 2-channel is only rated for 60 watts RMS per channel into a 4 ohm load. That just isn't much power for a pair of 12" subs. Even the bridged output is only 200 watts into 4 ohms, still at the low end for a sub, much less to share between a pair of subs.

Assuming that your subs are 4 ohm, you could probably get more sound by driving just one of them on the bridged terminals. But to get the best power with what you have, connect one sub to each channel, set the filter switch to the far right (LPF), set the operation switch to stereo (both channels driven), set the filter frequency (Hz) to 100 or lower, and adjust the input sensitivity as far clockwise as possible without causing distortion.

But, to do the subs justice, you really need at least 300-400 watts to share between them.

Hope this helps.

Sep 27, 2009 | Kenwood KAC-6202 Car Audio Amplifier

1 Answer

Need specs and wiring options


Eclipse 36401 eclipse%20pa36401.jpg
  • 105W x 4 Channel Max. Power Output at 2o.gif Stereo
  • 60W x 4 Channel 0.1% THD at 2o.gif Stereo @13.8V (RMS Continuous Power)
  • 40W x 4 Channel 0.1% THD at 4o.gif Stereo @13.8V (RMS Continuous Power)
  • ChannelFlex Crossover
  • Adjustable High-Pass Frequency (50-200Hz, L/R Independent)
  • Low-Pass Frequency (120Hz)
  • Adjustable Bass-Boost Level (45Hz, 0-9dB, F/R Separate)
  • High-Current, High-Speed Output Devices
  • High-Efficiency, High-Energy MOS-FET Power Supply
  • Audiophile Grade Component Selection
  • Intelligent 7-Way Discrete Protection Circuitry
  • Noise Reduction with Low Distortion & Ultra-Low Negative Feedback
  • High-Level Input - Add on Capability
  • Epoxy Composite PCB
  • 2o.gif Stable Design
Each 6 1/2" speaker will see 40 Watts
Each 6"x9" will see 521/2 Watts

Yes your solution is correct. Front wired in stereo, bridge rear.

Dec 29, 2008 | Eclipse Car Audio & Video

1 Answer

Amp Power light will not go on. Protection light is lit- Thump sound in speakers


It probably has shorted output transistors. To eliminate other possible causes, read through the following page.

Amplifier in Protect Mode - Troubleshooting

Let me know if you have any other questions.

Oct 31, 2008 | Visonik Dual Bass Box with Amplifier Car...

Not finding what you are looking for?
Car Audio & Video Logo

Related Topics:

42 people viewed this question

Ask a Question

Usually answered in minutes!

Top Peavey Car Audio & Video Experts

Glenn Boucher

Level 1 Expert

3 Answers

yadayada
yadayada

Level 3 Expert

75797 Answers

Tom Chichester

Level 3 Expert

34100 Answers

Are you a Peavey Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...