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Need opinion on good 3000+ amp
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<blockquote data-quote="mat3833" data-source="post: 8800533" data-attributes="member: 587645"><p>I've read the whole zed manual, I've also spoken at length to Stephen about how and why he does what he does when designing amps. My takeaway is pretty simple:</p><p></p><p>Most "signal" specifications provided on amps are irrelevant in the real world. Obviously this isn't counting RMS power, output current rating, crossover options/selection and to an extent signal-noise ratio. </p><p></p><p>Slew rate, damping factor, bandwidth, frequency response, all of these things can be measured in different ways, and nobody measures them in real world conditions with a real world install. </p><p></p><p>Amps and speakers work in conjunction with each other. The specific example I want to use here is damping factor (amp) vs inductance (subwoofer). An amp with a crazy high damping factor paired with a subwoofer with a very low Inductance would theoretically be the best possible match for reproducing the EXACT sine wave(s) of bass. Damping factor does jack **** in reality from my experience. Inductance however does have some effect. </p><p></p><p>For those unaware, inductance is the way we measure a coils resistance to voltage/current change. The higher the inductance the more resistant the coil is to "accepting" the change in voltage/current. Since speakers work off of AC power the coil is constantly being forced to accept a posative or negative charge. The lower inductance value helps the coil accept the change in its electromagnetic field faster, which leads to a quicker change in coil movement, which leads to more accurate reproduction of sound waves.</p><p></p><p>The same argument could be made for full bridge vs half bridge class D amps and their output filtering. Keeping it simple so I don't speak above my knowledge here, please overlook any over-simplification that's slightly off and focus on the main point. Half bridge class D amps use PWM switching to create their waveform so you must have good filters on the output section to avoid higher order noise generated from the PWM signal on the output that ends up as hiss or other noise when played through a tweeter. I can't recall the term but I beleive it's "ground referenced"? Full bridge amps need much less output filtering even tho they are also PWM driven. Since the amp produces both the positive and negative of the sine wave simultaneously the speaker doesn't "see" the noise because it acts like "balanced RCA's" and rejects anything not shared between posative rail and negative rail. </p><p></p><p>Does this make full bridge better than half bridge? Idk, depends on alot of factors. Theory doesn't directly translate to reality. </p><p></p><p>Matt</p></blockquote><p></p>
[QUOTE="mat3833, post: 8800533, member: 587645"] I've read the whole zed manual, I've also spoken at length to Stephen about how and why he does what he does when designing amps. My takeaway is pretty simple: Most "signal" specifications provided on amps are irrelevant in the real world. Obviously this isn't counting RMS power, output current rating, crossover options/selection and to an extent signal-noise ratio. Slew rate, damping factor, bandwidth, frequency response, all of these things can be measured in different ways, and nobody measures them in real world conditions with a real world install. Amps and speakers work in conjunction with each other. The specific example I want to use here is damping factor (amp) vs inductance (subwoofer). An amp with a crazy high damping factor paired with a subwoofer with a very low Inductance would theoretically be the best possible match for reproducing the EXACT sine wave(s) of bass. Damping factor does jack **** in reality from my experience. Inductance however does have some effect. For those unaware, inductance is the way we measure a coils resistance to voltage/current change. The higher the inductance the more resistant the coil is to "accepting" the change in voltage/current. Since speakers work off of AC power the coil is constantly being forced to accept a posative or negative charge. The lower inductance value helps the coil accept the change in its electromagnetic field faster, which leads to a quicker change in coil movement, which leads to more accurate reproduction of sound waves. The same argument could be made for full bridge vs half bridge class D amps and their output filtering. Keeping it simple so I don't speak above my knowledge here, please overlook any over-simplification that's slightly off and focus on the main point. Half bridge class D amps use PWM switching to create their waveform so you must have good filters on the output section to avoid higher order noise generated from the PWM signal on the output that ends up as hiss or other noise when played through a tweeter. I can't recall the term but I beleive it's "ground referenced"? Full bridge amps need much less output filtering even tho they are also PWM driven. Since the amp produces both the positive and negative of the sine wave simultaneously the speaker doesn't "see" the noise because it acts like "balanced RCA's" and rejects anything not shared between posative rail and negative rail. Does this make full bridge better than half bridge? Idk, depends on alot of factors. Theory doesn't directly translate to reality. Matt [/QUOTE]
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