I'd probably put the DC block capacitors before the relays and then have
resistors to ground. Having the resistors across the relay contacts will
give you crosstalk or poor off channel attenuation. On the relays, I'd use
either reed relays are bifurcated gold crosspoint relays. While mechanical
relays give you the best attenuation, least loss, and best distortion,
solid state switches are getting pretty good. We're currently using DG452
for line level analog audio switching.

Harold


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