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DIY For Audio
Rotel RB985 less is more? or am I an idot for even thinking about this?
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<blockquote data-quote="fdlsys" data-source="post: 771748" data-attributes="member: 2310"><p>If you join the channel inputs, your pre/processor will feel 1/2 of the power amp's input impedance. </p><p>I don't expect that to be a problem since most modern amps are in 100k input impedance and pre/processor should happily drive the 50k impedance.</p><p></p><p>One theoretically possible problem is joining the "cold" (ground) of the pwr amp inputs. </p><p>No idea how the grounds are resolved internally - you might end up with ground loop = hum. </p><p>Again, I don't expect a problem there since multi channel pre/pwr would have the grounds joined on at least one end already.</p><p></p><p>But, I also don't see a necessity for any mods in the amp. Safe and simple - rather get a "Y" RCA splitter. Female in, two male RCA out.</p><p>Plug the male RCAs into the Pwr amp inputs and you'll need only one cable from the pre to the "Y" female RCA. </p><p>This is also the cheapest way of testing the viability of signal splitting / joining.</p></blockquote><p></p>
[QUOTE="fdlsys, post: 771748, member: 2310"] If you join the channel inputs, your pre/processor will feel 1/2 of the power amp's input impedance. I don't expect that to be a problem since most modern amps are in 100k input impedance and pre/processor should happily drive the 50k impedance. One theoretically possible problem is joining the "cold" (ground) of the pwr amp inputs. No idea how the grounds are resolved internally - you might end up with ground loop = hum. Again, I don't expect a problem there since multi channel pre/pwr would have the grounds joined on at least one end already. But, I also don't see a necessity for any mods in the amp. Safe and simple - rather get a "Y" RCA splitter. Female in, two male RCA out. Plug the male RCAs into the Pwr amp inputs and you'll need only one cable from the pre to the "Y" female RCA. This is also the cheapest way of testing the viability of signal splitting / joining. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Rotel RB985 less is more? or am I an idot for even thinking about this?
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