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Multi-Way Conventional loudspeakers with crossovers

How much low frequency for the satellites of a 5.1 HT?
How much low frequency for the satellites of a 5.1 HT?
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Old 4th January 2019, 09:26 PM   #1
morgot9999 is offline morgot9999  Romania
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Default How much low frequency for the satellites of a 5.1 HT?

Dear all,

I hope I'm intruding here with my home theater question, it's about how low I have to go in frequency with the satellite channels of a home theater?
I intend to use an Onkio 5.1 or similar receiver, about 100W per channel and I intend to build the in-wall speakers and sub by myself.
The system will be used exclusively for movies and regular TV watching, the stereo system is separate.

The front and center channels will be identical, I try to stay with two way, maybe MTM, as I am novice in XO design.

How much bass do I need to the front-center-left channels, so I can have a clue about drivers selection?

Thank you!
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Old 4th January 2019, 09:42 PM   #2
bentoronto is offline bentoronto  Canada
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How much low frequency for the satellites of a 5.1 HT?
It all depends on where the sub is located. If near the screen and between the satellites, you can cross over quite high. Which lets you build quite compact satellites.

The sub can be anywhere in the room and crossing over can be done as high as maybe 140 Hz provided the speakers don't reveal themselves through distortion and noises and the crossover slope is steep.

If the satellites are good, hardly any reason to have a middle speaker. Which saves figuring out how to make a quality speaker in the little space for it and low down.

(Some folks like to boast that their acute sense of stereo is destroyed if the crossover is anywhere over 5 Hz.)

B.
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Old 5th January 2019, 12:13 AM   #3
rabbitz is offline rabbitz  Australia
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80Hz gives a good balance between LRC and sub. In years past that used to be a default in a lot of receiver and sub settings.
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Old 5th January 2019, 03:22 PM   #4
eriksquires is offline eriksquires  United States
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80 Hz, sealed is the THX standard. It makes it easier to match with a 4th order low pass in a subwoofer.



If the speakers are dedicated with room correction, don't bother with baffle step compensation. Let the processor do it, and you'll gain significant headroom.



Best,


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Old 5th January 2019, 07:02 PM   #5
cspieker is offline cspieker
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My opinion on this has changed drastically lately. See link.
DIY surround speakers
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Old 5th January 2019, 08:32 PM   #6
morgot9999 is offline morgot9999  Romania
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Reading the above posts makes me put more effort also into the surrounds.
I though I would go away with a cheap full range. hmm

OK, I will target L-C-R to 80 Hz, although I had in mind 2x FaitalPro 3FE25 in parallel. This full range drops about -9dB at 80Hz:
snap.png
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Old 5th January 2019, 08:44 PM   #7
bentoronto is offline bentoronto  Canada
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How much low frequency for the satellites of a 5.1 HT?
Quote:
Originally Posted by morgot9999 View Post
I though I would go away with a cheap full range. hmm
Waste of money. Your L and R will have to play clean and full to 40 Hz, which not a lot of good speakers can manage (if the truth be measured). Obviously your otherwise good FR won't work for 80 Hz but just fine for 140.

There is no "standard" for your room. Depends on speaker layout, etc.*

Possibly in a lab setting, people can just barely exceed random guessing at 80 Hz. But in real life with L and R and a screen in the middle, not a chance you need less than 140 Hz (with clean speakers and steep slopes).

Excepting people who claim they are clairvoyant or have special powers of hearing, many have posted here about being fully satisfied with highish freq crossover.

Why does this discussion recur over and over?

B.
* for decades I had corner horn in a corner far from L and R or sometimes even near my ear. No spatial distortion.
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Last edited by bentoronto; 5th January 2019 at 08:51 PM.
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Old 5th January 2019, 08:49 PM   #8
morgot9999 is offline morgot9999  Romania
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3FE25 with an EPB of 137.5 is also suitable for a horn.
I've seen online some of these mini-horn projects.
Still, it's Fs is at 110 Hz.
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Old 6th January 2019, 09:18 AM   #9
celef is offline celef
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I have read that it is important to create a large diffused sound field for the surrounds, that means using multiple surround speakers evenly spread out in the back of the room, from your sides an backwards and all mounted above ear height, pretty much like sound systems in movie theaters. With multiple surround speakers then small drivers can be used.
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Old 6th January 2019, 09:24 AM   #10
celef is offline celef
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Quote:
Originally Posted by morgot9999 View Post
Reading the above posts makes me put more effort also into the surrounds.
I though I would go away with a cheap full range. hmm

OK, I will target L-C-R to 80 Hz, although I had in mind 2x FaitalPro 3FE25 in parallel. This full range drops about -9dB at 80Hz:
Attachment 726860
If you use the 16 ohm version then you can connect 3 in parallell, and using total of 6 surrounds, 3 for left surround and 3 for right surround
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