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<blockquote data-quote="helotaxi" data-source="post: 1529008" data-attributes="member: 550915">Unless RC has changed his test, the stipulation was that you couldn&#039;t reliably distinguish between two amps of the same topology.&nbsp; Class D and Class A/B are different topologies.From a purist standpoint, if SQ is your goal, avoid Class D amps.&nbsp; The are not linear amps.&nbsp; They approximate the signal fed to them, they do not truly reproduce it.&nbsp; The more efficient the amp the grosser the approximation.&nbsp; As mentioned, you probably won&#039;t be able to note a difference at the subbass freqs, but you will definitely want a low cutoff freq for the sub.The problem that you run into is that if you want a lot of power for your sub-stage, you almost have to go with a Class D.&nbsp; The limiting factor is the efficiency of the Class A/B design.&nbsp; Best case you are looking at 50%.&nbsp; You can approach 85% with a good Class D.&nbsp; That is a huge reduction in load on the car&#039;s electrical system for the same amount of power.&nbsp; If you are looking at something in the 600W+ range and you don&#039;t want to go through the hassle of major reinforcement of the car&#039;s charging system, you would be hard pressed to go with anything other than a Class D IMO.Me personally, I&#039;m a SQ guy.&nbsp; I don&#039;t own a Class D amp and I can&#039;t forsee myself buying one.&nbsp; I don&#039;t need large amounts of power and I prefer fidelity over power.&nbsp; In a low powered system efficiency is not of paramount importance so I&#039;m not that willing to compromise linearity for a little savings in current consumption that doesn&#039;t make any difference in my car.</blockquote>

[QUOTE="helotaxi, post: 1529008, member: 550915"] Unless RC has changed his test, the stipulation was that you couldn't reliably distinguish between two amps of the same topology. Class D and Class A/B are different topologies. From a purist standpoint, if SQ is your goal, avoid Class D amps. The are not linear amps. They approximate the signal fed to them, they do not truly reproduce it. The more efficient the amp the grosser the approximation. As mentioned, you probably won't be able to note a difference at the subbass freqs, but you will definitely want a low cutoff freq for the sub. The problem that you run into is that if you want a lot of power for your sub-stage, you almost have to go with a Class D. The limiting factor is the efficiency of the Class A/B design. Best case you are looking at 50%. You can approach 85% with a good Class D. That is a huge reduction in load on the car's electrical system for the same amount of power. If you are looking at something in the 600W+ range and you don't want to go through the hassle of major reinforcement of the car's charging system, you would be hard pressed to go with anything other than a Class D IMO. Me personally, I'm a SQ guy. I don't own a Class D amp and I can't forsee myself buying one. I don't need large amounts of power and I prefer fidelity over power. In a low powered system efficiency is not of paramount importance so I'm not that willing to compromise linearity for a little savings in current consumption that doesn't make any difference in my car. [/QUOTE]

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