Phono Stage upgrade to complement Dohmann Helix One Mk 2

Lew, the high pass is made it at the input of my amps ( cap/resistor ) the low pass is made it by the Velodyne electronics. Maybe you can do the  same or look for a second hand Bryston croosver.

In the link I just posted you can read about 12"/15" drivers characteristics inside the same catalog models.

R.

As I mentioned, I've never used subwoofers before.  Based on limited reading, it seems that there are multiple approaches to connecting the subwoofers to a system.  (e.g.   All subwoofers have at least an RCA input for line level connection from your preamp or variable output on your amplifier. Do not use the record or tape output! These are fixed and you will have maximum bass at all times no matter what your main volume is set at! Some subwoofers have left and right inputs. If your preamp has left and right outputs, use two RCA cables for these. The subwoofer combines the channels inside. If your preamp has left and right outputs but there’s only one on the sub, use a Y combiner adapter. These can be had for $5 or so. Lastly, if you don’t have a subwoofer or preamp output on your amp or preamp, subwoofers such as the RELs we sell have a specific high level input which runs off your amplifier’s speaker binding posts. This cable simply piggybacks on your main speakers and does not draw any power from your amp. In this way, no matter what your system is, there’s a sub for you. )

Is there a "best" approach for monoblock amplifiers with two sets of binding posts?

Lew, the high pass is made it at the input of my amps ( cap/resistor ) the low pass is made it by the Velodyne electronics. Maybe you can do the  same or look for a second hand Bryston croosver.

In the link I just posted you can read about 12"/15" drivers characteristics inside the same catalog models.

After last week’s talk about a system I find ^this^ humerous.

 Lastly, if you don’t have a subwoofer or preamp output on your amp or preamp, subwoofers such as the RELs we sell have a specific high level input which runs off your amplifier’s speaker binding posts.

There is a certain simplicity and elegance in running the sub input off of the speaker’s binding posts. Not sure if it is just REL and Vandersteen, or if there are others as well.

Is there a "best" approach for monoblock amplifiers with two sets of binding posts?

I’m not sure I understandI?

I am guessing that the speakers have bi-wire posts?
So it sort of depends on whether you 4 sets of wire pairs, or a bundled bi-wire and whether it is a single end at the amp, or if there are two set of ends… and whether they can splay wide enough to hit both sets of outputs.

Thanks for the info, Raul.  You remind me that long ago I did consider just adding a capacitor in series with the input of my main amplifier, to create a Butterworth type hi-pass filter.  That still seems the least harmful way to do it. I calculated a .02uF capacitor (or two per channel for my balanced amplifiers) would do the trick for my amps, with an 80Hz flex point.

Holmz, I am no fan of the REL approach, for the reason that if you drive the subwoofer off the main amplifier output, then neither the main amplifier nor the main speaker derives any benefit in terms of reducing the workload inherent to reproducing the lowest bass frequencies. Moreover, any distortion in the output of the main amplifier is presented to the REL subwoofer amplifier at its input. Unfortunately, I long ago concluded that you cannot obtain all the major benefits of subwoofing unless you're willing to add a high pass filter on the main amplifier.

Holmz, was that "humerus" or "humorous"?  And why did you find it humorous?

@lewm

I suppose this means that your preferred approach would be to use both the XLR and RCA outputs from the pre-amplifier: one set for the monoblock amplifiers, and one set for the subwoofer.

If that’s the case, then it seems like my pre-amplifier would need a low pass and high pass cut off for the speakers to receive their proper signal and the subwoofers to receive their proper signal. Of course, another option would be to run the pre-amplifier signal through the subwoofer, which would be designed with low pass and high pass filters, and that signal would then pass to the amplifier to the ESL speakers. But I would think that this latter approach could degrade the signal going into the amplifier and ESL’s. It might be a no-win situation. . .