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<blockquote data-quote="keep_hope_alive" data-source="post: 7487797" data-attributes="member: 576029">i agree that a HU alone cannot switch between active or passive without a series of relays that rewire/reconfigure the system (bypass passive crossovers, reconfigure amplifier outputs, etc.)&nbsp; and the HU setting won&#039;t be able to control the relays, HU&#039;s don&#039;t have outputs like that.i had a relay board that would change between bridged amplifier outputs into the passive crossover inputs, or non-bridged but bi-amp crossover inputs.&nbsp; still have the board wired up actually (and a schematic if anyone is interested).&nbsp; in bi-amp i could use T/A for each driver and play with a few other settings, and in bridged mode I had to make front/rear equal.&nbsp;&nbsp; so i could load a preset on the processor (was a ERA-G320 at the time) and then flip a switch to change modes.&nbsp; one was louder and the other had a better sound stage.&nbsp; neither resulted in any possible damage since the passives were always used (comps were SPX-177R).i could design and build a relay board that would let you switch between passive or active, but in passive mode you would have two unused amp channels.&nbsp; you&#039;d need some tweeter protection and you&#039;d still have to change settings on the HU.most likely, the &quot;friend&quot; didn&#039;t explain what he was doing well enough for the OP to understand, and he has terminology mixed up.</blockquote>

[QUOTE="keep_hope_alive, post: 7487797, member: 576029"] i agree that a HU alone cannot switch between active or passive without a series of relays that rewire/reconfigure the system (bypass passive crossovers, reconfigure amplifier outputs, etc.) and the HU setting won't be able to control the relays, HU's don't have outputs like that. i had a relay board that would change between bridged amplifier outputs into the passive crossover inputs, or non-bridged but bi-amp crossover inputs. still have the board wired up actually (and a schematic if anyone is interested). in bi-amp i could use T/A for each driver and play with a few other settings, and in bridged mode I had to make front/rear equal. so i could load a preset on the processor (was a ERA-G320 at the time) and then flip a switch to change modes. one was louder and the other had a better sound stage. neither resulted in any possible damage since the passives were always used (comps were SPX-177R). i could design and build a relay board that would let you switch between passive or active, but in passive mode you would have two unused amp channels. you'd need some tweeter protection and you'd still have to change settings on the HU. most likely, the "friend" didn't explain what he was doing well enough for the OP to understand, and he has terminology mixed up. [/QUOTE]

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