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Wide dispersion rear surrounds

just1n

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Hey everyone,

Any recommendations on bookshelf speakers with wide dispersion for rear duty?

Thanks
 

sarumbear

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I’m using JBL CBT70J-1 and very happy. They have a smooth 140 degrees dispersion.
 

Dj7675

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As already mentioned the JBL CBT models are really great for this kind of thing.
 
OP
J

just1n

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I’m using JBL CBT70J-1 and very happy. They have a smooth 140 degrees dispersion.
Good idea. I would have to cut back to the cost and go with the JBL CBT50LA-1. The 70 are just too rich for me blood.

May I ask what your other speakers are and how they work together tonally?
 

jhaider

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Another satisfied JBL CBT user here (50 and 100), with 708i front (all three) and TAD/Pioneer heights.

NHT C3 or the older Classic Three works very well as a surround, too. Very wide and even coverage, and beautifully built cabinets. If we had the space for them I likely would have bought C3 to use as sides and kept the Classic Threes we used as rears in the old house in that role.
 

GXAlan

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tifune

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Hello friend! I'm sure it's not the answer you're hoping for, but your M106's would probably be great with adequate power.

Re: JBL's CBT's, they're also great for this use case not only out of box but the 70's can be upgraded later with the bass extension. I use a "single" 70J+E for my backyard and that thing can overpower 50 people at 15m using only a $150 Beringer amp. Don't let the price scare you. I don't think they're a big seller so you can find them on steep discount if you watch JBL's site. I think I got my J+E for $800 shipped (MSRP $2k IIRC)

That said, I've recently become one of those obnoxious no-point-in-buying-anything-less-than-8" zealots so I use 708p's which can also be had on steep discount if you're patient. It took some convincing on the WAF side of thing but once she got into Stranger Things and nearly got blown off the couch during some monster fight, she was sold
 

Chromatischism

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I doubt you really need dispersion like the JBL CBT's.

The Infinity RS152 was designed so that you could sit closer to it, if that's your concern. Ready to mount on-wall.
 

tifune

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Another satisfied JBL CBT user here (50 and 100), with 708i front (all three) and TAD/Pioneer heights.

Sorry to hijack; are you using the recommended Crown amp for that? I regularly see Crowns 8x600W for 70-80% off on used markets but, even though I should know better as a Genelec/Neumann owner, the 0.35% distortion spec make me pause. But I'm also not willing to own any more 100lb Monoliths in my lifetime... This would be for Revel Be series, but I doubt that matters much.
 
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sarumbear

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Good idea. I would have to cut back to the cost and go with the JBL CBT50LA-1. The 70 are just too rich for me blood.

May I ask what your other speakers are and how they work together tonally?
Check my about page.
 

jhaider

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Sorry to hijack; are you using the recommended Crown amp for that? I regularly see Crowns 8x600W for 70-80% off on used markets but, even though I should know better as a Genelec/Neumann owner, the 0.35% distortion spec make me pause. But I'm also not willing to own any more 100lb Monoliths in my lifetime... This would be for Revel Be series, but I doubt that matters much.

Yes, 8|600n for LCR and heights, and 4|600n for the CBT sides and rears (and 4|1250n for subs). Fan noise is their biggest disqualifier for most home use. The outputs are quiet enough - I can hear some faint hiss from the 708s if I stick my ear into the horn, but basically nothing from the CBTs when they’re not playing. You do, as with any pro amp, need to be careful with gain staging. The flip side of that is, unlike most home amps, they have controls to do so.

Agree - you don’t want a 100lb Monolith for Revel PerformaBe. You really want a 100+ lb ATI AT4007! :)
 

sarumbear

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Thomas_A

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There should be some dedicated surround speakers available with very wide dispersion, e.g. from SVS, Monitor Audio, and others?
 

sarumbear

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The Infinity RS152 was designed so that you could sit closer to it, if that's your concern. Ready to mount on-wall.
Is this the speaker you are suggesting?

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Conclusions
I have none to offer other than cringing at the sight of two tweeters in opposing fashion trying to produce sound. And a woofer in the back which is also supposed to do midrange duty. Is this ever going to work? I don't know. You analyze it and tell me!
 

Chromatischism

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On what criteria you base your doubt, if I may ask?
Normally the reason is you will be sitting close to them or you will have a lot of people seated.

Most of us build these things for our own enjoyment :)

Now, the OP could have those criteria, maybe he's building a theater, but he hasn't given us info about it. So, I guess my doubt was based on the notion that only a small % of setups could really use that kind of speaker to its fullest.
 

Andysu

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the classic JBL 8330 mkI mkII (THX) if heard in real THX cinemas ? they are so choice and affordable . good parts and for made in mid/late 1980's they be even ideal for today as when back then in some most substandard Dolby cinemas to THX cinemas . i use x11 8330 mkII of them sidewall to back wall . x9 8330A overheads . but if you not actually noticed them in cinema , should have since 85% of cinemas used them .

my late cat Sooty walks on it , so the 8330 have even passed T C A T H X tests .

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my cat Magic walks on it

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my cat Bear lays it

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more of them for testing before installation

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i been thinking of changing the back wall with cluster of x6 tightly placed together
another x6 on higher of sidewall and maybe possible another x12 on sidewall lower down on the walls
even thinking it is possible to expand the overhead surround basic stereo from present x3 overhead per height 1 2 3 channel to at least x5 per height channel with extra expanding decoding but kinder thought since atmos mixes are mostly waste of time due to how they are mixed to much running time they get ?
although i can blend the regular surround channel into the overhead that bypass the common upmixer which is totally useless . i can do it far, far better .

most of the 8330 mkII came from twickenham film studios dubbing stage . so many famous movie mixes have passed though these surround speaker monitors .

so no need to spending hundreds to few grand for line array line source . mine , sounds like no , is like a cinema . single screen to multiplexes come in all shapes and sizes .

average get 8330 for less than £60 some just under £100 and they are THX approved . home THX dipole just don't sound like what i heard with JBL THX at THX cinema and dipole often for pair used still someone asking hundreds .
 
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tifune

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Yes, 8|600n for LCR and heights, and 4|600n for the CBT sides and rears (and 4|1250n for subs). Fan noise is their biggest disqualifier for most home use.

I'm really glad you pointed that out. Crowns fan noise spec is 45dB @ 1m so I didn't give it a second thought. MLP is 2m; do you think it would be noticeable?
 

jhaider

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I'm really glad you pointed that out. Crowns fan noise spec is 45dB @ 1m so I didn't give it a second thought. MLP is 2m; do you think it would be noticeable?
The word I’d use is excruciating, not just noticeable.
 
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