Phono Stage upgrade to complement Dohmann Helix One Mk 2

@rauliruegas 

Yes, you would be correct that I have no experience with subwoofers.  Does the Velodyne insert into the system between the pre amplifier and amplifier, with both a LPF for it's own amplifier and an internal HPF that then is sent to the monoblock amplifiers?

Yes, and that has been written here above over the past several days.  If you buy a modern Velodyne sub, you would need nothing else.  It comes with a built in two way crossover and an amplifier dedicated to driving its subwoofer.  It also comes with a microphone and the necessary circuitry to set up the subwoofer for best flattest response.  I was wondering why you seemed to feel that introducing a subwoofer also meant you would have to give up your present preamplifier (to go digital for some reason) and even your main speakers.  Not so.

I don't agree with Holmz in some cases, but for me to debate Holmz here would only confuse you further.

Or maybe it would not?

Suffice to say, as I said before, a properly integrated subwoofer will not give you the sensation that the cello is jumping from main speaker to subwoofer and back again.  On that score, Holmz and I agree.

And we both are advocating use of a high pass filter between the preamp and the amp. I just buy mine, and others use a capacitor.

On the other hand, I am not a fan of digital filtering or digital shaping of the response.

People with DACS and streamer, and CD players are alreadily heaving inverted in digital tech…

It is easier to tolerate a DSP on the sub chain side.
And the HPF solutions we are both talking about are on the main L/R channel side,.

I am still trying to figure out the difference other than manufacturers sticker.
It looks like you fancy the Velodyn and I like the Vansdersteen.

Unfortunately, the more I read about HPF, the less inclined I am to use them: everything that I’ve read so far indicates that their use does impact SQ.

Well is there a link to that?
And is it a digital or analogue HPF?

Additionally, here’s a paragraph about higher order HPF influencing signal moreso than lower order HPF (but it is just the internet, which could be wrong):

There is slower transcient response, but if you have a speaker with a crossover, then I am not sure one can be a purist.

Although there is no limit to the order of a filter that can be formed, as the order of the filter increases so to does its size. Also, its accuracy declines, that is the difference between the actual stop band response and the theoretical stop band response also increases.

I think you might be talking about speaker level XOs that have the inductors.

The ones with capacitors are not large, as they are RCA level. The big ones are the size of a couple packs-o-smokes.

@rauliruegas @lewm

Which Velodyne subwoofers would you recommend for best match and highest quality? What about Martin Logan subwoofers, or other brands?  (Velodyne has no photos of the back of their subwoofers and no diagram of connections on their website or downloads; the only Velodyne video on YouTube is 20 years old.  It seems like they're trying to hide something!)

Thanks.

@holmz 

I was just reading multiple reviews about various HPF and they all say that there is a noticeable affect on SQ.  But I suppose it's worth a trial.  The current problem is finding the best ones to initiate this trial with:. Vandersteen, Martin Logan, or Velodyne?  (I suppose Magico would be an option if it weren't a trial, but a definite move.)