Official JTR speaker thread - Page 128

Originally Posted by mrcoop

how hard is it to move the coax to the top on the t8. Got them a month ago and had in mind of keeping the t8's as left and right and now thinkin, going with t12's for the front and moving t8's to the side surrounds but must have the coax on the top do it...can an inexperience person who has never seen the inards of a speaker be able to do it? Thanks

Originally Posted by mrcoop

how hard is it to move the coax to the top on the t8. Got them a month ago and had in mind of keeping the t8's as left and right and now thinkin, going with t12's for the front and moving t8's to the side surrounds but must have the coax on the top do it...can an inexperience person who has never seen the inards of a speaker be able to do it? Thanks

Originally Posted by Blackdevil77

Something came to mind I actually forgot about. you guys using the JTR set-up, what speakers are you using for surrounds? I'm guessing the slanted 8's are intended to be the surround speakers? If I were to do a 7.2 set up, should I get 2 slanted 8's for the sides, and 2 triple 8HT's for the rear? Or slanted 8's all around would be good?

Also, wouldn't the slanted 8's, not being as efficient, and being an 8 ohm speaker wouldn't receive the same amount of power as the other 4 ohm speakers, so wouldn't they get sort of drowned out, if you will?

Originally Posted by Gooddoc

I'm no crossover expert, but I do know that having two drivers stacked on top of each other like that covering the same frequency range is a very bad idea...

Originally Posted by N8DOGG

I run T8's and single 8's as surrounds. Unless you are in a HUGE room, I'd get the slant or single 8's, the T8's are beyond overkill. Yes they can keep up no problem. Your surrounds won't use the same power as your mains. I've never had a case of the surround falling behind ever and I will run over reference quite often.

Originally Posted by RMK!


What's up doc? ...

You might want to contact these guys (Revel)

along with B&W and well just about every manufacturer of three way speakers as they are all propagating that "very bad idea" with their vertical stacked bass drivers...

Originally Posted by Blackdevil77

How big is your room? I know my room isn't huge. It measures 14 X 25 X 7.5 feet, so 2,625 cubic feet.

Originally Posted by Gooddoc

Hey, I think I did preface that with I'm no expert. But those speakers are built with crossovers that are meant to deal with the driver arrangements. Its not like you could take the drivers out of that Revel speaker and rearrange them any which way you want so long as the wires are long enough and still have the speaker sound the same...

Originally Posted by N8DOGG

By big, I mean 20x30x10 or along those lines. Even then I don't think you'd need them. My room is 13 x 32 x 8 but the HT part is kept within 20 of the 32 feet, it's open to the rest of the basement. My T8's are so over kill it's really pointless to spend the extra money on them, they are crossed over at 80hz anyways, there really isn't much benefit to have the T8 over the single 8 or slant 8.

Originally Posted by Gooddoc

Hey, I think I did preface that with I'm no expert. But those speakers are built with crossovers that are meant to deal with the driver arrangements. Its not like you could take the drivers out of that Revel speaker and rearrange them any which way you want so long as the wires are long enough and still have the speaker sound the same...

Originally Posted by kwarny


It is a 3-way so the issues with the woofers covering the same frequency range down low does not run into the same issues as to say an MTM speaker with the midranges spaced too far apart (depends on distance between the midranges and how high in frequency the crossover is implemented). I also assume that Jeff uses high order crossovers since I have never heard anyone complaining of these stressing.

Jeff uses a coaxial driver so he can arrange the T12 in multiple ways. The compression driver and midrange waves arrive from the same location where the crossover frequency is much higher (shorter wavelengths). Now if we rearranged the Revel speaker from its WWMT to a WMWT then I would expect a messed up frequency response at all axis due to the Mid and Tweeter being spaced too far apart. This lobing occurs when the drivers are spaced further than 1/4 of the wavelength apart. Some of us probably can't even hear the effect with the drivers spaced 1/2 of a wavelength apart. This is why two tweeters are not common. A rear tweeter is sometimes used in certain designs for extra ambience though.

Originally Posted by kwarny

It is a 3-way so the issues with the woofers covering the same frequency range down low does not run into the same issues as to say an MTM speaker with the midranges spaced too far apart (depends on distance between the midranges and how high in frequency the crossover is implemented). I also assume that Jeff uses high order crossovers since I have never heard anyone complaining of these stressing.

Jeff uses a coaxial driver so he can arrange the T12 in multiple ways. The compression driver and midrange waves arrive from the same location where the crossover frequency is much higher (shorter wavelengths). Now if we rearranged the Revel speaker from its WWMT to a WMWT then I would expect a messed up frequency response at all axis due to the Mid and Tweeter being spaced too far apart. This lobing occurs when the drivers are spaced further than 1/4 of the wavelength apart. Some of us probably can't even hear the effect with the drivers spaced 1/2 of a wavelength apart. This is why two tweeters are not common. A rear tweeter is sometimes used in certain designs for extra ambience though.

Originally Posted by kma100

Thanks for the explanation. I moved the CD from center to top and then was convinced it didn't sound "as good" because I assumed the crossover was designed with the CD in the middle. I know other people have done the same, and even Jeff says it is ok...but I kept thinking it sounded "not as good".

Amazing how *perception* clouds science.

Originally Posted by Blackdevil77

I see, your right. And when I just thought about it, in an actual movie theater, the whole theater is surrounded my speakers that resemble the slanted 8, nothing huge like they have behind the screen.

These are the speakers all my local movie theaters have in them to be exact. Yes, I actually look at the speakers when I go to the movies or club or anywhere I go lmao.

http://www.jblpro.com/catalog/Genera...?PId=278&MId=1

Many have the older version of this

Originally Posted by N8DOGG

O ya, everywhere I go I'm writing down model numbers taking pics with my phone. My wife just rolls here eyes lol. If I did it again, I would not buy the T8's as surrounds. I'd save the money and buy something else with the money I saved buying the S8. BTW, I was the first person to get the new s8's

Originally Posted by N8DOGG


I would think the difference you may be hearing is the fact the CD is higher to your ear and thats the difference you are hearing. As far as I know the crossover isn't designed to have the driver one way or the other. I actually changed out my 2010 crossover to the 2011 with the new CD. Those cabs and that crossover were crazy well built. The crossover was the size of a book and weighted probably a pound or 2.

Originally Posted by kma100

Good point. I have the Triple 8, but the same principles should apply. Just need to upgrade the sub. An 8" sub doesn't quite match up with Jeff's products! :-)

Originally Posted by Blackdevil77

WOW! I think if I had that in my room, everybody in the room would probably liquify from the sound lol.

4 Submersive HP's!!!! That would be awesome, but would Audyssey have a problem calibrating 4 subs?

Originally Posted by giomania

I have a Denon AVR-4311CI with Audyssey MultEQ XT32, which is designed for calibrating two subwoofers. In my setup, both "pairs" of Subs are in "matchbook" locations in the room. Then, each of the "pairs" is connected to one of the subwoofer outputs with a "Y" cord.

So, Subwoofer 1 output drives two subs (pair #1), and Subwoofer output 2 also drives two subs (pair #2).

I hope this helps.

Originally Posted by Blackdevil77

I was thinking about doing that, just wasn't sure if it would throw Adyssey for a loop. So basically, couple the pairs, and act like they are two single cab, dual driver subwoofers, rather then 4 separate single driver subwoofer cabinets.

Originally Posted by Blackdevil77

WOW! I think if I had that in my room, everybody in the room would probably liquify from the sound lol.

4 Submersive HP's!!!! That would be awesome, but would Audyssey have a problem calibrating 4 subs?

Originally Posted by mjaudio

People are under the impression that Audyssey applies different EQ to each sub in a 2 sub system, that is not true. Audyssey XT32 with SubEQ only sets the distance (phase) and levels of 2 subs separately but applies EQ to all the subs as 1. If you go for 4 subs just try and keep the pair of subs that are connected to sub out 1 the same distance from the LP and the same goes for the pair of subs connected to the 2nd sub out. You could actually try stacking each pair of subs on top of each other which will increase output as well.

A lot of people run more than 4 subs, just ask N8 Some extra user set-up is required but Audyssey can do the job whether you have 1 or 10 subs.

Originally Posted by AV Science Sales 5

I do the exact same thing. Symmetrical front and back placement of four DIY sealed subs. I used to use PEQ on individual subs and measure using REW, but really like the results from the Denon 4311. Using T8's for the front stage and JBL Pro 8340 (not A version) for the surrounds.

Originally Posted by Andy Lammer

I'm thinking of getting 3 Triple-8 or Triple-12 for LCR.

Anyone running 3 of them horizontally across the front, say 18" off the floor with a slight tilt up ? Any issues with such a setup ? Reason I ask is that the next screen will be 138" wide ( non AT ) and one runs out of ceiling height !

- Andy