Author Topic: Cross over frequencies  (Read 447 times)

Offline Genesis777

Cross over frequencies
« on: August 08, 2020, 08:45:44 AM »
In setting up the cross over frequencies on an avr, why is it recommenced that all speakers are set to cross over at 80hz even if you are running large full range front speakers?

Further why is it recommend that the fronts and center channel be set to small rather than large in the speaker setup option?
Denon RX-A3600H, Parasound 2250 v2, Optoma UHD51, B&W 683 S2, B&W HTM61 S2, B&W 685 S2, Yamaha YST-SW800, Cambridge Audio 640C, Sony Blu-Ray BDP-S7200

Offline chrisc

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Re: Cross over frequencies
« Reply #1 on: August 08, 2020, 09:37:51 AM »
There is no hard and fast rule

Does the AVR assume you are running a sub-woofer?
If you are not, do not cross over at 80Hz
The size selection of the front speakers depends on what you are using
It would make sense to choose "small" if you were in fact using small speakers with a sub, but seeing you are using full-range units, select "Large"
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Offline TimbaLand

Re: Cross over frequencies
« Reply #2 on: August 08, 2020, 09:47:45 AM »
I go with what @chrisc os saying but not on the part about full range speakers. Very few speakers out there have the ability to go very low so rather set them to small and cut of the fronts above 10-20hz above their spec. You will get the benefit of more bedroom on your AVR and also of the sub doing better LF tha your fronts
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Offline chrisc

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Re: Cross over frequencies
« Reply #3 on: August 08, 2020, 11:11:24 AM »
You never know, they might be giant ported boxes that go down to 17Hz, like the big Giya's do

AVRs are ideal for bedrooms..  :D
Music is the shorthand of emotion

Offline jvr

Re: Cross over frequencies
« Reply #4 on: August 08, 2020, 11:11:59 AM »
Speakers set to large receive full range signals, while the sub receives the LFE. Most center and rear speakers can't reproduce the full range signals, and the rest of the signal below speaker capacity will be lost. If you select them as small, the AVR diverts the balance of the signal to either the front speakers (if set to large), or the sub (if fronts are set to small). Ideally you want to limit the load on the fronts, so by setting them as small the signal load gets diverted to the sub.

80Hz is a standard that THX has set and generally reproduces the best balance for multichannel reproduction (the mixing engineers use the same standard). But feel free to experiment with the fronts by setting them to small and a cross over matching its spec's (allow for 10 to 20Hz headroom).
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Offline TimbaLand

Re: Cross over frequencies
« Reply #5 on: August 08, 2020, 12:06:45 PM »
You never know, they might be giant ported boxes that go down to 17Hz, like the big Giya's do

AVRs are ideal for bedrooms..  :D

🤣🤣🤣🤣 typos 🙈
Marantz AV7705|Rotel RC1570, RMB1585 and RMB1565| B&W 804 Diamond, HTM2 Diamond, B&W ASW850 and Velodyne DD15 Subwoofers, 685 and DS3, CCM In ceilings| Optoma UHD40|Audioquest CV4 speaker cables and Mogami XLR| HP Microserver| Nvidia Shield

Offline TimbaLand

Re: Cross over frequencies
« Reply #6 on: August 08, 2020, 12:10:02 PM »
Typo correction

I go with what @chrisc is saying but not on the part about full range speakers. Very few speakers out there have the ability to go very low so rather set them to small and cut off the fronts 10-20hz above their frequency response spec. You will get the benefit of more headroom on your AVR and also of the sub doing better LF than your fronts will
Marantz AV7705|Rotel RC1570, RMB1585 and RMB1565| B&W 804 Diamond, HTM2 Diamond, B&W ASW850 and Velodyne DD15 Subwoofers, 685 and DS3, CCM In ceilings| Optoma UHD40|Audioquest CV4 speaker cables and Mogami XLR| HP Microserver| Nvidia Shield

Offline KenMasters

Re: Cross over frequencies
« Reply #7 on: August 08, 2020, 12:21:40 PM »
You never know...

But we do know, he has B&W 683 S2s - they should be set to small. This goes for the vast majority of speakers, unless your sub is under-specced.
« Last Edit: August 08, 2020, 12:29:27 PM by KenMasters »

Offline Vince MacMahon

Re: Cross over frequencies
« Reply #8 on: August 08, 2020, 12:42:38 PM »
Most AVR allows for two XO settings:
1. HT
2. Stereo

You could adjust to small for HT and set the crossover 10-20Hz above where you know your speakers start to roll off LF,
Set the speakers to Full Range for 2 channel playback (for when you listen to music)


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Offline Genesis777

Re: Cross over frequencies
« Reply #9 on: August 08, 2020, 12:46:55 PM »
In setting up the cross over frequencies on an avr, why is it recommenced that all speakers are set to cross over at 80hz even if you are running large full range front speakers?

Further why is it recommend that the fronts and center channel be set to small rather than large in the speaker setup option?
I go with what @chrisc os saying but not on the part about full range speakers. Very few speakers out there have the ability to go very low so rather set them to small and cut of the fronts above 10-20hz above their spec. You will get the benefit of more bedroom on your AVR and also of the sub doing better LF tha your fronts

So if Iím running a sub and the front speakers go down to 40Hz I can set the fronts at say 60Hz and leave the rest of the speakers at 80Hz, while setting all speakers as small. Will give this a go and see if I hear any difference. Thanks gents
Denon RX-A3600H, Parasound 2250 v2, Optoma UHD51, B&W 683 S2, B&W HTM61 S2, B&W 685 S2, Yamaha YST-SW800, Cambridge Audio 640C, Sony Blu-Ray BDP-S7200

Offline Vince MacMahon

Re: Cross over frequencies
« Reply #10 on: August 08, 2020, 12:48:38 PM »
Try that,

For rest of speakers, also check what their capabilities are ito frequency response.
Some rears, especially satellites battle at 80Hz and opens up at 120Hz and above.

What are using for the Centre and Rears?


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Offline chrisc

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Re: Cross over frequencies
« Reply #11 on: August 08, 2020, 01:49:55 PM »
I set my stereo pair at 120Hz, even though they are 10" units.  Works well
Music is the shorthand of emotion

Offline Genesis777

Re: Cross over frequencies
« Reply #12 on: August 08, 2020, 05:44:21 PM »
Try that,

For rest of speakers, also check what their capabilities are ito frequency response.
Some rears, especially satellites battle at 80Hz and opens up at 120Hz and above.

What are using for the Centre and Rears?


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Center B&W HTM61 S2 and Rears 685 S2
Denon RX-A3600H, Parasound 2250 v2, Optoma UHD51, B&W 683 S2, B&W HTM61 S2, B&W 685 S2, Yamaha YST-SW800, Cambridge Audio 640C, Sony Blu-Ray BDP-S7200

Offline Vince MacMahon

Re: Cross over frequencies
« Reply #13 on: August 08, 2020, 05:50:25 PM »
60Hz Centre
80Hz Rears


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Offline Genesis777

Re: Cross over frequencies
« Reply #14 on: August 08, 2020, 05:56:30 PM »
Great, will do. Thanks Vince!
Denon RX-A3600H, Parasound 2250 v2, Optoma UHD51, B&W 683 S2, B&W HTM61 S2, B&W 685 S2, Yamaha YST-SW800, Cambridge Audio 640C, Sony Blu-Ray BDP-S7200