Home Speaker Asylum

General speaker questions for audio and home theater.

It really depends on how the Logans sound now in the deep, mid and upper bass if driven hard, on their own.

'Stats can struggle in the deep bass, and this can have an impact further up.

That is, it is possible that they would sound a lot better when fed a high-pass filtered signal, say from 40Hz up or higher.

In other words you might not know how to maximise the return on the crossover until you try it out.

Is there a low-pass passive filter built into each VMPS sub? If yes what is its -3db frequency?

What is the frequency range of the Bryston crossover?

If it gets down to say 30Hz or even 40 hz it might be possible to run just the low-pass side of the crossover and not use the high-pass side to feed a filtered signal to the existing amp's and your 'stats.

At least one sub maker - REL - used to recommend this approach.

The benefit there is that the feed to the Logan's does not pass through an extra line-level circuit. So that part of you system would remain as transparent as it is now. But the issue of over-excursion of the 'stats is still there.

Given it's a Bryston it is likely that it has 4th order Linkwitz Riley slopes. That increases the likelihood that it has just one pair of matching HP and LP slopes, OR a set of discrete frequencies with matching HP and LP slopes.

You might need to be pretty certain of at what frequency the Logan's roll-off in-room on their own and how quickly they die below that.

It might be possible to have the R and C of the filters changed to meet your needs.

If it's an old item it might be worth looking at upgrading the PSU at least.

I've linked this thread over to the planar asylum. Some folks there possibly have a pr of the same era Logans and can advise precisely about these issues.


Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger



Edits: 07/29/15

This post is made possible by the generous support of people like you and our sponsors:
  The Cable Cooker  


Follow Ups Full Thread
Follow Ups
  • It really depends on how the Logans sound now in the deep, mid and upper bass if driven hard, on their own. - Timbo in Oz 19:02:39 07/29/15 (0)

FAQ

Post a Message!

Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Subject:
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.