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REL subwoofer crossover question

Hope someone can help me out with this.....I am somewhat familiar with how the crossover settings work on REL subs (2 Brittania B2) but don't know if they differ from other manufacturers such as Velodyne. My question is should I be hearing bass frequencies in the 60-80 hz range when I have the crossover setting at the A 1 position (which according to the manual rolls of at 22 HZ? I'm not too familiar with how the crossover rolls off, but I'm surprised that I can't get any rolloff below 80HZ. Is this room nodes/issues or what? I have played a little with placement and all but haven't gone crazy with them. I am using a single RCA for the left one out of my preamp and vice versa. (I haven't tried the neutrik connections yet, have to purchase if the are truly better). Any thoughts? Thanks.
audioguy3107
mwheelerk
121 posts
 
It is a ground issue with some 'D' series amps. REL addresses this in the operators manual of their newer models.
ptmconsulting
1,000 posts
 
The Neutrik connectors from the amp assume a common ground plane, that's why there are only 3 wires (R+, L+, either -) and not 4. A balanced amp does not have a common ground plane. So you can only get one channel into the sub with the Neutrik, at best. You need to connect the sub to the preamp via RCA's if you have a balanced amp, or get 2 subs.
mekong56
137 posts
 
I think in the case of a balanced amp, you would need to connect the ground wire to a ground lug or screw on the the preamp, which should give you a common ground for each channel. This is not entirely clear in the manual for my B2, but it has worked fine for me (I have a BAT balanced amp and preamp). The manual shows this connection configuration for mono amps, and also mentions (albeit not very clearly) this configuration for a differentially balanced stereo amp also.
daveyf's avatar
daveyf
2,836 posts
 
Hooked up the system as suggested by the ARC tech and all seems to work fine.
The REL T5 is a great match to my speakers and room, highly recommended for the small room music only system.
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