just finishing off drawings for a custom build analog summing box.
its all pretty straightforward, 6 stereo channels, flexible routing with rotary switches etc etc however ive a couple of points im scratching my head on.
i am contemplating adding some form of voltage attenuation on the main output.
my initial thought was to just add a double tracked potentiometer across the hot feed to the L and R XLR outputs, especially given that this system is passive and has no power. has anyone got any better ideas regarding how to accomodate this. it may be that i just leave off completely however i feel it may be a nice addition if i can get a solution that wont degrade the audio signal. there will be no requirement to gain signal, just attenuate.
any thoughts regarding pot size? it will be running line levels at +4dbu.
second point is that i thought about adding a mono/stereo output switch as an option.
my initial though had been to add a 6 pole 2 way rotary to the output feed, in one position the feed would basically just pass through to the main outputs, in the second they would be joined to one (summed) and then passed to L and R outputs.
again any thoughts about this, im finding inexpensive 6 pole rotary switches hard to locate here in the UK. i guess i could use 4 pole and just use the + and - wires for each output, ground being effectively the same anways however again, any thoughts on this would be much appreciated.
using a 6 pole would be more correct but would it make any practical difference, especially since it will only be just for auditioning then switched back.
i guess i could incorporate some form of M/S option that would allow narrowing of stereo image right down to mono however i feel a straight switch may be best.
its all pretty straightforward, 6 stereo channels, flexible routing with rotary switches etc etc however ive a couple of points im scratching my head on.
i am contemplating adding some form of voltage attenuation on the main output.
my initial thought was to just add a double tracked potentiometer across the hot feed to the L and R XLR outputs, especially given that this system is passive and has no power. has anyone got any better ideas regarding how to accomodate this. it may be that i just leave off completely however i feel it may be a nice addition if i can get a solution that wont degrade the audio signal. there will be no requirement to gain signal, just attenuate.
any thoughts regarding pot size? it will be running line levels at +4dbu.
second point is that i thought about adding a mono/stereo output switch as an option.
my initial though had been to add a 6 pole 2 way rotary to the output feed, in one position the feed would basically just pass through to the main outputs, in the second they would be joined to one (summed) and then passed to L and R outputs.
again any thoughts about this, im finding inexpensive 6 pole rotary switches hard to locate here in the UK. i guess i could use 4 pole and just use the + and - wires for each output, ground being effectively the same anways however again, any thoughts on this would be much appreciated.
using a 6 pole would be more correct but would it make any practical difference, especially since it will only be just for auditioning then switched back.
i guess i could incorporate some form of M/S option that would allow narrowing of stereo image right down to mono however i feel a straight switch may be best.