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Vandersteen 2Wq subwoofers with M5-HP crossovers - help needed

I have been happily using a pair of Vandy 2Wq subs with single-ended M5-HP crossovers for a few years now. My system was dialed in the way I like it (bass a bit on the full side, but still tight and defined). I just had my amplifier repaired and upgraded, and the new input impedance is 22k ohms vs. the 10k ohms before the upgrade. I followed the Vandersteen recommendation for the jumper settings in the M5-HP (6 and 7 only, "on" or not open), and the bass is just about MIA altogether. As per the Vandy web site, I disregarded the chart on the case of the M5-HP and followed the chart on the web site.  Because I am an idiot, I didn’t bother to mark down the settings of the jumpers prior to changing them. Anybody have any suggestions for me that will restore the bass? I am pretty sure the issue is the jumper settings. Thanks in advance!
bondmanp
mr_m
1,087 posts
 
Yes. Richard's personality is very colorful!
bondmanp OP
1,465 posts
 
@audioconnection I am starting to lose it. Tried 80Hz settings recommended, 1 up and 1 down, and I get no sound out of 2Wqs. Upped efficiency control to 85 dB, no difference. Burned a CD of Vandertones, but my amp did NOT like being touched by multimeter pins.... triggered protection circuit repeatedly.

I set the M5-HPs back to the 20k settings and will try letting them and the amp burn in for a while.

FYI, I took the M5=HPs and 2Wqs out of the chain altogether and got much better low end from my speakers run full range. I really miss what the 2Wqs used to do. :-/
hifiman5's avatar
hifiman5
1,611 posts
 
Did you try the 10k setting?

mr_m
1,087 posts
 
Bondmanp,
You mentioned dialing back one the efficiency knob back to 85db. Shouldn't you be going up to 86, 89, or 90db to produce more output from the 2Wq? That's what I did to mine to increase bass output. If I'm wrong, I have then set my sub incorrectly.
audioconnection
1,015 posts
 
Bond,
  the instructions below
 the part you missed that engaged the protection
 If you go to Vandersteen website under resources download the Vandertones make a CD or file
((((((((((((((((((((((((( turn preamp volume down.)))))))))))))))))))))
 track 27 is 1000 hz track 31 is 80 HZ get a Voltmeter set to AC Volts looks like a sideways s snake and connect probes clipped to amps speaker posts Red is Plus Black is Minus
Play track 27 and slowly raise preamps Volume up till Volt meter says 1 V AC then play track 31 if your dips are set right it should now read.707
 once you get it set a few days of run in should sound great again.
  JohnnyR
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