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Sensitivity and Watt's Question
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<blockquote data-quote="keep_hope_alive" data-source="post: 8659082" data-attributes="member: 576029"><p>Hi, I know you said 22W but i should have clarified that you can expect the first 5W to be usable, listenable. Beyond 5W distortion becomes audible and at 10W it will sound poor and at 22W it will be un-listenable and likely not possible. This relates to how these amplifier IC's are rated. Note that the amplifier IC itself is contained on a single chip the size of a quarter and it does all of the amplification for all 4 channels. This amplification is the result of the outputs being bridged (so think of it as an 8 channel amp bridged to 4 channels). But the IC has power leads the size of a thin lead which could in no way handle 88W of output power (since input power is output power + efficiency losses (heat). Instead, a manufacturer can rate an amp 22Wx4 if only one channel can produce 22W for one second. It is misleading, I know, but that's how the industry has been for years (home receivers are notorious for this - note the UL Listed max power draw of a receiver - such as 100Wx7 with a max draw of only 325W). Typically, you can assume about 25% of an IC amplifier chip being usable. </p><p></p><p>Long story short, expect you'll only want to listen to 5W per channel of a head unit.</p><p></p><p>JBL, Polk, Hertz, JL Audio, Alpine - all have viable options in those sizes - even if they are entry-level models. My personal favorite for coaxial 6.5 and 6x9 combos is the Hertz High Energy (now the Mille Pro). But those come at a steep price. Keep in mind you'll want to consider wiring up front components so the tweeters are pointed at your face - that will greatly improve sensitivity since door speakers are pointed at your ankles.</p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 8659082, member: 576029"] Hi, I know you said 22W but i should have clarified that you can expect the first 5W to be usable, listenable. Beyond 5W distortion becomes audible and at 10W it will sound poor and at 22W it will be un-listenable and likely not possible. This relates to how these amplifier IC's are rated. Note that the amplifier IC itself is contained on a single chip the size of a quarter and it does all of the amplification for all 4 channels. This amplification is the result of the outputs being bridged (so think of it as an 8 channel amp bridged to 4 channels). But the IC has power leads the size of a thin lead which could in no way handle 88W of output power (since input power is output power + efficiency losses (heat). Instead, a manufacturer can rate an amp 22Wx4 if only one channel can produce 22W for one second. It is misleading, I know, but that's how the industry has been for years (home receivers are notorious for this - note the UL Listed max power draw of a receiver - such as 100Wx7 with a max draw of only 325W). Typically, you can assume about 25% of an IC amplifier chip being usable. Long story short, expect you'll only want to listen to 5W per channel of a head unit. JBL, Polk, Hertz, JL Audio, Alpine - all have viable options in those sizes - even if they are entry-level models. My personal favorite for coaxial 6.5 and 6x9 combos is the Hertz High Energy (now the Mille Pro). But those come at a steep price. Keep in mind you'll want to consider wiring up front components so the tweeters are pointed at your face - that will greatly improve sensitivity since door speakers are pointed at your ankles. [/QUOTE]
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