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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
gdnrbob
4,458 posts
 
Glad to hear that the problem has been isolated.
I would be interested in hearing what Mr. V. finds in those M5-HP's. I didn't think there was anything that could go wrong with them.
Bob
hifiman5's avatar
hifiman5
1,832 posts
 
I've had my M5-HP for years.  With as much as Richard upgrades his wares I wonder if the crossover has undergone any substantive upgrades.  Anyone know??
bondmanp OP
1,821 posts
 
After speaking with Ray at Vandersteen and John Rutan, my impression is that there have been only minor running changes to the M5-HP over the years.  Mostly things like wire connections and dressing, and I think there may have been a revision of the recommended dip-switch settings when using the M5-HPs with the 2W series subwoofers.  Other than that, I can't say.
drew_k's avatar
drew_k
34 posts
 
I had a question related to setting the M5-HP boxes for use with high efficiency main speakers (97db).  The knob on the 2wq only goes to 94db.  (So when you turn up the volume, the main speakers get louder earlier than the subs.)  If you want more bass than the 94 dB setting allows, would you set them to the next lower impedance rating (for example, 50k to 30k) so that the multimeter reads 0.8xx instead of 0.7xx?
gdnrbob
4,458 posts
 
@drew_k ,
I think Johnny would be the best person to ask. You can PM him if you want.
Bob
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