Vandersteen Sub woofers v Rythmik Subs

@lewinskih01 Thanks.  I had no idea.  So, the Rythmic subs also have a fixed crossover of ?Hz?  Remember, the Vandy doesn't pass the amplified signal through it's own crossover, but requires both main speakers and Vandy sub speaker wires be connected to the speaker taps simultaneously.  If that is also the case with the Rythmic subs, I stand corrected.  All I can say is that I plopped my 2Wq subs in the front corners of my room, made a few adjustments to the Q and level controls, and got seamlessly integrated, deep, powerful and tuneful bass.  And that's with both my old Vandy 1Cs and my current Ohm Walsh 2000s.

I haven't used the Rythmiks in this fashion for several years, and I'm away from home for a couple weeks to check, but my recollection is they have the option to connect to the amp taps and have a knob to adjust the xo frequency so your loudspeakers run the full bandwidth and Rythmiks run from the bottom up to the set xo frequency. Another phase knob and PEQ adjustments.

Alternatively there is the option for the internal xo fixed at 80Hz. And lastly the option for line input, which is what I use in my active system but xo and phase correction are done upstream and not really what OP was asking about.

@bondmanp 

Not really. Rythmiks also have the connection to feed off the amp taps, have phase and Q adjustments. But having more variables, hence options, also introduces more uncertainties, which is why sub integration is such a difficult task especially if done without measurement equipment

Ahh ^That^ is interesting.
The Vandy line is designed to be in phase all the way down… So I was concerned that some other sub could be way out of the “driver’s acoustic” phase.

@500homeruns  aka  Steve : I slogged thru the M12 manual and didn’t see a high pass filter, settings for it and IMO a phase accurate filter ( after all you did buy a time and phase accurate speaker in the Treo - congrats btw, you should consider joing tge vandersteen owners forum on the Vandy site. Not everyone there owns Vandy subs. There are more than a few Treo owners w other subs…well integrated… )

First the Treo in most rooms are flat to 40 hz. You can implement the low pass filter in the M12 if desired. Having the sub play higher than 40 hz will create some swarm effect and smooth in room response. Obviously the sub three has 11 bands of EQ below 120 hz and is not powered by a garden variety plate amp. I wouldn’t discount 3 x 8” and a power factor corrected feed forward optimized amp…but hey the do cost $ for a made in USA sub/amp. You may want to borrow a M5 high pass filter and see what that sounds like at a range of settings. Mid bass slam and midrange clarity are typical improvement as load comes off the main amp. You can then either buy a set of filters OR implement them inside your Rogue power amps.

Have fun, let me know if i can help.

Jim

Thanks for the replies!

@tomic601 Jim, The NAD has the crossovers listed as “Main Frequency” and “Sub Frequency” on page 12 (Speaker Setup) of the manual: