Vandersteen 2WQ

I have a pair of sealed custom made 3 way speakers of approx 97dB efficiency.....and have blended in a pair of Vandy 2Wq subs (one behind each speaker) for the last 4 years.
I found the 'blending' to work well and seamlessly (to my ears)....and far better than the REL Stadium II subwoofer which I had for the previous 10 years.
Initially I used the fixed low-pass filters of 50K on my RCA speaker cables....but have since switched to balanced XLRs using the active MP-5 filters for even better results at 33K.
I can highly recommend the 2Wq Subs (especially in pairs to counter room modes) and would never go back to 'au naturel'.

Bob,
I appreciate your contribution......but am a little confused?
The Low-Pass filter built into the 2Wq subs own amplifier only operates below 80Hz I believe....or are you saying there is some output ABOVE 80 Hz for the actual sub?
I thought there was general agreement that below 80Hz......there was no audible directionality to the sound which would mean that the subs could be placed away from the main speakers without disclosing their locations?
Am I missing something here?

The issue with the 2Wq sub is the first order low pass filter. It effectively forces one to use them in pairs and place them close to the main speakers.

I think it's a High Pass Filter allowing everything above 80Hz to pass straight through to the amps.
They fit on the ends of the interconnects and plug into the amp/s.
The subs themselves can then be situated anywhere you wish.

Bondmanp,

A great upgrade is to the M5-HP crossovers, which, IME, are more transparent, and provided subtle, but easily heard, improvements in soundstage openness, imaging, and transient reproduction.

Agreed......I have them in balanced XLRs.
Incidentally...the instructions Vandersteen send with them, give you the correct dip switch arrangement for the 2Wq subs.