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Car Audio Equipment
Amplifiers
5 Channel Amp -- A little more
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<blockquote data-quote="zako" data-source="post: 7903320" data-attributes="member: 629735"><p>Infinity's claim sounds like BS to me. A 4ohm speaker is a 4ohm speaker. Keep the wiring out of this please. What they really want to do is to pass this as a 2ohm speaker to people who want a 2ohm speaker and as a 4ohm speaker to people who want to connect a 4ohm speaker. It can't be both, can it? What if I have upgraded speaker wiring (I did!).</p><p></p><p>I must warn you though that if speaker's impedance does dip below 4ohm a lot of Class A/B amplifiers will not deal with this gracefully. Many will run considerably hotter, and some go into thermal protection on a right hot day if the amplifier's physical install is not good.</p><p></p><p></p><p>Lots of people claim than high end Class D amps are just as good. Let's not start this war again. High end amp companies are building Class D amps, and there are also plenty of crappy A/B amplifiers on the low end.</p><p></p><p></p><p>Is SNR of 85 really low? I heard claims that SNR of 70 or more is not audible. Specially in the car, SNR is the last think I'd worry about. Ragged frequency response.. speaker path-length differences, lack of sound proofing, bad ground, can have a far greater effect on sound.</p><p></p><p></p><p>MB Quart ONX4.80/500 seems ok. At least it measures fine with respect to all claims (<a href="http://www.avtozvuk.com/az/2010/10/054-mbq.htm" target="_blank">russian article</a>) To be fair, the same web site looked at Polk D5000.5 and Alpine MRX V60/V70, both seemed ok too. For the same price, my pick would be MRX-V70 because of size and price, but maybe I am more biased towards these newer Class D amps. It's basically PDX level of technology inside. You get a bit less power than in PDX, for a much lower price. For your criteria MB Quart seems a better fit. MB Quart itself used to be a mid-level brand. Later it got bought by Maxxsonics, and their quality supposedly has gone down. On average, you should very much expect to get what you pay for.</p><p></p><p>I actually have two amplifiers installed, a Class A/B MB Quart REF4 and a PPI Class D, with one set of spare channels. Maybe I'll try to set gains on both to identical level with DMM and do a comparison test when I am not lazy. I have been actually investigating the midrange harshness coming from my mids running off Class A/B channels. Of course, this could certainly come from the setup, install, and tuning (done by the head unit automatically).</p></blockquote><p></p>
[QUOTE="zako, post: 7903320, member: 629735"] Infinity's claim sounds like BS to me. A 4ohm speaker is a 4ohm speaker. Keep the wiring out of this please. What they really want to do is to pass this as a 2ohm speaker to people who want a 2ohm speaker and as a 4ohm speaker to people who want to connect a 4ohm speaker. It can't be both, can it? What if I have upgraded speaker wiring (I did!). I must warn you though that if speaker's impedance does dip below 4ohm a lot of Class A/B amplifiers will not deal with this gracefully. Many will run considerably hotter, and some go into thermal protection on a right hot day if the amplifier's physical install is not good. Lots of people claim than high end Class D amps are just as good. Let's not start this war again. High end amp companies are building Class D amps, and there are also plenty of crappy A/B amplifiers on the low end. Is SNR of 85 really low? I heard claims that SNR of 70 or more is not audible. Specially in the car, SNR is the last think I'd worry about. Ragged frequency response.. speaker path-length differences, lack of sound proofing, bad ground, can have a far greater effect on sound. MB Quart ONX4.80/500 seems ok. At least it measures fine with respect to all claims ([URL="http://www.avtozvuk.com/az/2010/10/054-mbq.htm"]russian article[/URL]) To be fair, the same web site looked at Polk D5000.5 and Alpine MRX V60/V70, both seemed ok too. For the same price, my pick would be MRX-V70 because of size and price, but maybe I am more biased towards these newer Class D amps. It's basically PDX level of technology inside. You get a bit less power than in PDX, for a much lower price. For your criteria MB Quart seems a better fit. MB Quart itself used to be a mid-level brand. Later it got bought by Maxxsonics, and their quality supposedly has gone down. On average, you should very much expect to get what you pay for. I actually have two amplifiers installed, a Class A/B MB Quart REF4 and a PPI Class D, with one set of spare channels. Maybe I'll try to set gains on both to identical level with DMM and do a comparison test when I am not lazy. I have been actually investigating the midrange harshness coming from my mids running off Class A/B channels. Of course, this could certainly come from the setup, install, and tuning (done by the head unit automatically). [/QUOTE]
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