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<blockquote data-quote="HCCA" data-source="post: 5282585" data-attributes="member: 571196">K, I&#039;ve read a lot of this thread, but still have a couple questions. The comments on interface, and bypassing.....I don&#039;t have any stores near me with these units in stock to play with. So, I don&#039;t know what bypassing is referring to, and I haven&#039;t had time to play with the interface of each one to see what I like, myself.As for the output voltage....I am old school. I don&#039;t listen to just rap. So, loud is not as much a priority, as SQ. You are correct that output voltage doesn&#039;t increase sound quaility...in, and of itself. HOWEVER...2V outputs are derived from the car&#039;s 12v supply, which itself varies with the alt/battery/load. 4V,5V,8V outputs, use switching power supplies. These switching power supplies use a constant rail voltage to derive the higher output voltages. In short, they have clean output up to the rated voltage. 2V units will ALLclip the output signal near full volume. Don&#039;t know about the rest of you, but I could do without unnecessary clipping induced into an otherwise &quot;clean&quot; system. Second, the larger the &quot;clean&quot; signal voltage to the amp (or other downstream component), the less noise you will pick up at the downstream gains. Doesn&#039;t matter if I can &quot;match&quot; the gains to the incoming signal. Your preAMP stage AMPLIFIES the incoming signal, and any noise that came along for the ride.Small amount? Maybe. But, all vehicles are different. What might be nothing for one vehicle, might be intolerable on another. If nothing else, I&#039;ll just take the 4V output for the lack of clipped signal at full volume.</blockquote>

[QUOTE="HCCA, post: 5282585, member: 571196"] K, I've read a lot of this thread, but still have a couple questions. The comments on interface, and bypassing.....I don't have any stores near me with these units in stock to play with. So, I don't know what bypassing is referring to, and I haven't had time to play with the interface of each one to see what I like, myself. As for the output voltage....I am old school. I don't listen to just rap. So, loud is not as much a priority, as SQ. You are correct that output voltage doesn't increase sound quaility...in, and of itself. HOWEVER...2V outputs are derived from the car's 12v supply, which itself varies with the alt/battery/load. 4V,5V,8V outputs, use switching power supplies. These switching power supplies use a constant rail voltage to derive the higher output voltages. In short, they have clean output up to the rated voltage. 2V units will [B]ALL[/B]clip the output signal near full volume. Don't know about the rest of you, but I could do without unnecessary clipping induced into an otherwise "clean" system. Second, the larger the "clean" signal voltage to the amp (or other downstream component), the less noise you will pick up at the downstream gains. Doesn't matter if I can "match" the gains to the incoming signal. Your preAMP stage AMPLIFIES the incoming signal, and any noise that came along for the ride. Small amount? Maybe. But, all vehicles are different. What might be nothing for one vehicle, might be intolerable on another. If nothing else, I'll just take the 4V output for the lack of clipped signal at full volume. [/QUOTE]

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