MB QART QAA4250: An unusual amp that leaves good impression

摘要

Sure, I've dabbled with MB Quart over the years: some home speakers, some car audio speakers, My experience has been that they have delivered better than average sound for a higher than average price, Now, like many "speaker" companies, they are making amplifiers. Is it just something to sell with their speakers or does the MB Quart QAA4250 "Quad Mono" amplifier stand on its own merits? The QAA4250 is a regulated Class A/B amplifier with a digital READ, display on top that tells you about battery voltage, temperature, gain, crossover frequencies and so forth MB Quart has some rather curious power ratings for the QAA4250: 4 × 250 watts at 4 ohms, 4 × 250 watts at 2 ohms, 1 × 500 watts bridged (rear only) at 4 ohms and 1 × 500 watts bridged (rear only) 8 ohms. Yeah, I know what you are thinking, you're supposed to get twice the power at 2 ohms-I'll explain more about this later, For crossovers, it has 50Hz to 5kHz highpass and lowpass selection and a front-end (preamp) bypass switch in case you have a really clean 2,4-volt input and don't want to use the internal crossovers.