Used them several times with fantastic results ....... if the company changed hands recently like within the past 6 months I do not know if they are what they were.

I have ran this in my boat the last 3 yrs, love it.

What speakers and sub or subs are you powering with it?

Mb quart is not a German speaker anymore. After Rockford sold them about 4 years ago they really went down hill. They are made in Korea now I beleave. The old mb quart that everybody loved is now called German mistro. Have there new speakers sounds a lot like the old stuff people seem to love them. I don't know how old those amps are, but hopefully where are some of the big older ones and not the new ones.

MB Quart made some really nice hi end home audio speakers back in the day…The old school MB Quart guys ended up reforming another company after the maxxonics take over called German Maestro. The technologies are similar…


Basically and of the MAXXsonics units are china. I am not sure where exactly they switched over for the car stuff, but any of the new amps other than the Q series 1000W amps QAA1000, QAA2500, QAA4250 and the reference amps (RAA1000, RAA4200, RAA2400) will be the maxxsonics units. for example any of the premium and discus and marine amps are maxxsonics, and as for the speakers, anything that is new is more than likely maxxsonics units. You may want to ask the seller (if looking to purchase) and verify the box.

FYI on digital amps. Its more hype than anything else... Your stereo puts out an analog signal and your speakers can ONLY play an analog signal. Unless you are running long distances between the head unit and amps that require a fiber optic cable there is no point in digital. Plus you then need to convert the analog signal to digital and then back to analog. All of this creates distortion. All of the alpine stuff is Class D, (which does not mean digital) which is really cheap to make. These amps have came a long way and don't sound that bad anymore. However if your looking for a truely great soundling amp find a class A/B amp... They do take more power and create more heat but its not as bad as some will tell you. I'm a big fan of older SoundStream, Orion, Linear Power and PPI stuff. IMHO none of the new stuff holds a candle to it. All hand made in the USA. If something goes wrong you just take it to your local electronics repair shop they'll fix it for a few bucks.. If something goes wrong with a class d amp you throw it in the trash can.

Is there a standard of measurement that everybody goes by to state what is class A B C D E F G ?

My old Linear Power 3002 is still thumping:drink:

Check this out:

Let's have a quick look at some of the power amp "classes", so we have all the info:

Class-A Output device(s) conduct through 360 degrees of input cycle (never switch off) - A single output device is possible. The device conducts for the entire waveform in Figure 1

Class-B Output devices conduct for 180 degrees (1/2 of input cycle) - for audio, two output devices in "push-pull" must be used (see Class-AB)

Class-AB Halfway (or partway) between the above two examples (181 to 200 degrees typical) - also requires push-pull operation for audio. The conduction for each output device is shown in Figure 1.

Class-C Output device(s) conduct for less than 180 degrees (100 to 150 degrees typical) - Radio Frequencies only - cannot be used for audio! This is the sound heard when one of the output devices goes open circuit in an audio amp! See Figure 1, showing the time the output device conducts (single-ended operation is assumed, and yes this does work for RF).

When I first wrote this article, I had completely forgotten about the Quad "Current-Dumping" amp, which uses a low power "good" amplifier, with a push-pull Class-C type amp to supply the high currents needed for high power. Although these enjoyed a brief popularity, they seem to have faded away. I was reminded of their existence by an article by Douglas Self ("Class Distinction", in the March 1999 issue of Electronics World ), in which he quite rightly points out that the current-dumper is (at least in part) Class-C.

Class-D Quasi-digital amplification. Uses pulse-width-modulation of a high frequency (square wave) carrier to reproduce the audio signal - although my original comments were valid when this was written, there have been some very significant advances since then. There are some very good sounding Class-D amplifiers being made now, and they are worthy of an article of their own.
There are many amplifier topologies which I have not mentioned above, mainly because most of them are either too bizarre, not worth commenting on, or are too complex to explain simply. Of these, Class-G and Class-H use power supply switching and modulation (respectively). This provides greater than normal efficiency and lower dissipation, but both are essentially Class-AB designs.

Although many audio amps may be called Class-B, generally they are not. Virtually without exception they are Class-AB, although most will be at the bottom end (conduction for 181 degrees for each device). Most power amps operate in Class-A up to about 5 to 10mW, after which they become Class-B.

Nice find Fireguy. All I know is that I like the sound of an A/B amp and there simplicity. Class A sound even better but they're really expensive and not very powerful. IF something breaks on an older amp usually a $1.00 part will fix it. But normally they just run and run and run.....