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<blockquote data-quote="DS-21" data-source="post: 6590911" data-attributes="member: 577690">I have a BB175.4.&nbsp; It&#039;s a fine sounding amp, though some have reported artifacts up top that I&#039;ve never heard from mine.&nbsp; What people don&#039;t seem to realize is that amps are commodity parts.&nbsp; Unless they&#039;re really incompetently designed, or broken, they all sound the same.&nbsp; I&#039;ve done comparisons between &quot;mid-fi&quot; (Adcom) and &quot;High End&quot; (Classe) and &quot;Class D&quot; (Panasonic XR-55 receiver using the TI PurePath chips) at different times, and never heard a difference.&nbsp; Ditto with several car amps, including an Adcom vs. a PPI A404.2, a PPI A404.2 vs. a Jello 300/4, and even a PPI A404.2 vs. a Sony Xplod 2-channel, with the PPI bridged.&nbsp; (Ditto with a Samsung DVD player vs. a $3500 Meridian CD player.&nbsp; Audio electronics are commodity parts generally; speakers, placement, and signal processing matter, and electronics just don&#039;t.)Is it noisy?&nbsp; I drive a small roadster with a mild cat-back upgrade, and only use my car audio system while driving so amp noise is not a care of mine unless it&#039;s a high-pitched whine.That said, there are some reasons why the BB175.4 is so cheap.&nbsp; Some of the parts used are just crappy.&nbsp; For example, the terminal threads on one of my BB175.4&#039;s speaker terminals just gave out under only moderate compression (I only torque stuff down enough to hold the wire, in this case a 12AWG stranded) because the metal they use is weak.&nbsp; That is why I replaced it.It also didn&#039;t sound any more powerful than the Jello 300/4 that it replaced, and that replaced it.&nbsp; I don&#039;t know if that&#039;s because the Jello is underrated (I doubt it, because JL is full of competent people who know how to rate product) or the Planet Audio amp is overrated.&nbsp; Keep in mind that my system runs all 8Ω drivers, so both of them loaf and run pretty cool in my system.</blockquote>

[QUOTE="DS-21, post: 6590911, member: 577690"] I have a BB175.4. It's a fine sounding amp, though some have reported artifacts up top that I've never heard from mine. What people don't seem to realize is that amps are commodity parts. Unless they're really incompetently designed, or broken, they all sound the same. I've done comparisons between "mid-fi" (Adcom) and "High End" (Classe) and "Class D" (Panasonic XR-55 receiver using the TI PurePath chips) at different times, and never heard a difference. Ditto with several car amps, including an Adcom vs. a PPI A404.2, a PPI A404.2 vs. a Jello 300/4, and even a PPI A404.2 vs. a [I]Sony Xplod[/I] 2-channel, with the PPI bridged. (Ditto with a Samsung DVD player vs. a $3500 Meridian CD player. Audio electronics are commodity parts generally; speakers, placement, and signal processing matter, and electronics just don't.) Is it noisy? I drive a small roadster with a mild cat-back upgrade, and only use my car audio system while driving so amp noise is not a care of mine unless it's a high-pitched whine. That said, there are some reasons why the BB175.4 is so cheap. Some of the parts used are just crappy. For example, the terminal threads on one of my BB175.4's speaker terminals just gave out under only moderate compression (I only torque stuff down enough to hold the wire, in this case a 12AWG stranded) because the metal they use is weak. That is why I replaced it. It also didn't sound any more powerful than the Jello 300/4 that it replaced, and that replaced it. I don't know if that's because the Jello is underrated (I doubt it, because JL is full of competent people who know how to rate product) or the Planet Audio amp is overrated. Keep in mind that my system runs all 8Ω drivers, so both of them loaf and run pretty cool in my system. [/QUOTE]

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