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<blockquote data-quote="keep_hope_alive" data-source="post: 8299093" data-attributes="member: 576029">some modern head units still clip the output, especially if tone controls are used.&nbsp; my Alpine decks have not but I&#039;ve measured clipping on other brands.&nbsp; it can be affected by the system voltage also.the problem is worse when people use high level inputs or line output converters.&nbsp; the speaker outputs of head units will clip, and usually just above 75%.75% volume is a safe level to use and makes sense because recording level varies.&nbsp; some albums (especially before 1990) are recorded quieter and you want some headroom.the safe way to set gains is to set the input sensitivity to the voltage level of the pre-outs.&nbsp; that&#039;s why the units are there.&nbsp; if your amp is cheap and doesn&#039;t offer much for labels, then look at the input sensitivity range and assume it&#039;s linear.clipping causes harmonics.&nbsp; if you turn up the high pass filter on the amp and play a low frequency tone, you can measure AC voltage and watch for a jump in level - that will be the point of clipping.</blockquote>

[QUOTE="keep_hope_alive, post: 8299093, member: 576029"] some modern head units still clip the output, especially if tone controls are used. my Alpine decks have not but I've measured clipping on other brands. it can be affected by the system voltage also. the problem is worse when people use high level inputs or line output converters. the speaker outputs of head units will clip, and usually just above 75%. 75% volume is a safe level to use and makes sense because recording level varies. some albums (especially before 1990) are recorded quieter and you want some headroom. the safe way to set gains is to set the input sensitivity to the voltage level of the pre-outs. that's why the units are there. if your amp is cheap and doesn't offer much for labels, then look at the input sensitivity range and assume it's linear. clipping causes harmonics. if you turn up the high pass filter on the amp and play a low frequency tone, you can measure AC voltage and watch for a jump in level - that will be the point of clipping. [/QUOTE]

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