I auditioned a RELQ400E yesterday. The sub was too slow moving.
Okay - when the source demands low frequencies - the REL was fantastic. A very powerful sound with seemingly little effort from the REL - but the higher bass frequencies were so much quieter. - it made the sound very disjointed...
I am very close to either purchasing a REL Q400E - or the 16-46PCi - (I can't hear the SVS before I buy as I'm in the UK)
I would be very interested in your comments if you are able to compare these two subs - or the Q400E and any SVS sub ?