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Old 24th March 2004, 02:28 AM   #1
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Default question for those using subs with 2 channel stereo

When you listen to music with a system that includes a subwoofer, do you run your main speakers full-range and cross over the sub to blend with the natural rolloff of your mains, or do you run the mains at a high pass frequency?

I just bought a NAD T742 receiver, and the bass management options suck. It's a non-selectable 100hz frequency, which runs the mains high-pass in surround, but keeps them full range in 2 channel. Obviously this makes bass integration very difficult. Before I return this for an HK receiver with far more flexible bass management, I've entertained the idea of running the sub at a lower frequency to just fill in where the mains leave off, but having the mains run high pass would reduce excursion which should (at least in theory) clean up the midrange.

So... how are you guys doing it?
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Old 24th March 2004, 03:23 AM   #2
michael is offline michael  Australia
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Ive got the same receiver, its good but yes the options are limited compared to my last receiver, just set the main speakers to large, mine run full range in this setting in both stereo and surround. Then i adjust my subs lowpass to meet them.
Maybe you have a defective model.
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Old 24th March 2004, 12:24 PM   #3
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If I set them to large it would play full range in every mode too. When set to "small" the speakers only play high-passed when in a surround mode.
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Old 24th March 2004, 01:02 PM   #4
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If the sub amp has a crossover use it and run the mains at full. I cross my sub at 50 Hz. IMO, the lower you can go before crossing to the sub the better.
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Old 24th March 2004, 10:52 PM   #5
michael is offline michael  Australia
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Quote:
If I set them to large it would play full range in every mode too. When set to "small" the speakers only play high-passed when in a surround mode.
Yes, it should play full range if set to large 100hz is fine as most subs will also have a lowpass built in, so you can still lower it.
I dont think you ahould have any problems, stay with the NAD, its good. and to get better power in the HK you have to spend a lot more, and only the HIGH model HKs have preouts (our NAD has em).
Also be wary because many HKs have coolong FANS on the backs of them, unlike the NAD T742
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Old 25th March 2004, 12:52 AM   #6
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The HK makes the same power as the NAD, has a full set of pre-outs, and can use the 2 "rear" channels from the 7.1 system to power a pair of aux speakers in a second room if you choose not to run 7.1. Bass management is fully selectable individually for fronts, center & surrounds.

All for the same price. I just hope it sounds as good. I just don't think I could live with the NAD for long. It is so rudamentary that I'd outgrow it too soon.

The Nad is back in the box.
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Old 25th March 2004, 12:59 AM   #7
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2-way speakers distort unacceptably when fed any sort of bass and need an electronic cross-over. The midrange performance on my Definitive BP8s and NHT1.3as got substantially better once they were relieved of the bass via an 80Hz 2nd order high pass filter.

Dipole and vented speakers need an electronic cross-over when used with high-volume low frequency source material because excursion gets too extreme at low frequencies.

If I was running a 3+ way speaker where the lowest driver was in a sealed enclosure and had nothing to do with the mid-bass/lower midrange I'd try the low-pass only.
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Old 25th March 2004, 09:10 AM   #8
michael is offline michael  Australia
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Quote:
The HK makes the same power as the NAD, has a full set of pre-outs, and can use the 2 "rear" channels from the 7.1 system to power a pair of aux speakers in a second room if you choose not to run 7.1. Bass management is fully selectable individually for fronts, center & surrounds.
Wow that sounds good, what model is it, as when i was getting my NAD the HK with same specs was almost twice the price, HK must be cheap in US, here in Aust the equivelent HK model is the 2550, which is lower powered and no preouts.
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Old 25th March 2004, 11:59 AM   #9
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I'm looking at the HK AVR-330 or last year's AVR-325. I can get the 330 for $479 to my door from an authorized dealer. The 325 is getting hard to find, and from authorized sources seems to cost almost as much as the 330.

I'm just afraid that it's not going to sound as good. :-/
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Old 25th March 2004, 09:38 PM   #10
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Quote:
Originally posted by Drew Eckhardt
2-way speakers distort unacceptably when fed any sort of bass and need an electronic cross-over.
Wow thats a gross generalisation, maybe at extreme SPL - but only then!
I run 2 ways with 2 subs & being a small box they do not reproduce much below 70hz.

I run a valve pre-amp with dual outputs, 1pr running to may main valve monoblocks the other to an external active xover running to a separate power amp then onto my TL subs.

I experimented using the high-pass filter on the xover, well the sound went from really good to complete loss of soundstage & imaging & took on a typical cheap solid state 'glare' - sure the speakers reproduced less bass & the mid was perhaps 'cleaner' but at what cost! It went from being musical & relaxing to I just want to switch it off!

So in effect the high-pass filter added distortion!

I know in an HT receiver it is a different thing (but for most of them I dont rate them as having good sound quality - sorry)
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