I have a pair of Vandersteen 2W subs, and recently purchased an RMB-1085. The 2W is a little unusual because it connects in parallel with the speakers via the speaker terminals on the amp. There is a high pass filter added to the line inputs to the amp that rolls off the low frequencies. The gain in the sub power amp then boosts the signal accordingly. The sub amps also have a very high input impedance so that they don't draw very much power from the amp. The theory is that this helps to blend the subs in with the main speakers. From what I have heard in the past, it works really well.
I connected the 2Ws to the RMB-1085 and got a great deal of hum, and very little output. I then found out that many Class D amps have a DC offset on the outputs, and learned from Vandersteen's website that the 2W amp does not like DC offset. The RMB-1085 has around 24V DC offset (No problem for the speakers, but the sub amp doesn't like it).
Has anyone had any experience with this? Is there a way to reduce the DC offset on the 1085? I really like the amp, but if I can't figure this out I will need to trade it for a 1075.
Thanks,
Robert
I connected the 2Ws to the RMB-1085 and got a great deal of hum, and very little output. I then found out that many Class D amps have a DC offset on the outputs, and learned from Vandersteen's website that the 2W amp does not like DC offset. The RMB-1085 has around 24V DC offset (No problem for the speakers, but the sub amp doesn't like it).
Has anyone had any experience with this? Is there a way to reduce the DC offset on the 1085? I really like the amp, but if I can't figure this out I will need to trade it for a 1075.
Thanks,
Robert
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