Official JTR speaker thread - Page 235

Originally Posted by SeaNile 

Not too add to the confusion but I just hooked up the inuke6000 amp. Looks like it requires an XLR splitter to drive both A&B channels?

Anyway, if I am to get the subs to read 75db I'll give it a shot. I've only got about a week of this before the other subs show up and then it will get real confusing for me and Audyssey.

Originally Posted by carp 

Cool review of the pro Noesis.

http://forums.prosoundweb.com/index.php/topic,141934.0.html

Originally Posted by beastaudio 

Sorry you are all confused. Audyssey has to work with what it's got, so my suggestion, now that I know you have gain knobs on you amps, what you need to do BEFORE Audyssey is a little different from what I originally suggested. The attenuators will work still, but you could also just level match the amp gains with all the speaker trims set at "0" on the AVR, and adjust the amp gains until each channel reads 75dB, then run Audyssey.

Originally Posted by Jedirun 

If I remember right, he is using an Emotivalounge amp without gain settings for his LCR so he does need attenuators.

Originally Posted by beastaudio 

Those are JRT, This is JTR A little different Take a look at the actual JTR website www.jtrspeakers.com, those are the real deal The ones you have linked to from ebay are not.

Originally Posted by cshuff 

Greetings from Omaha,

Need input on amp(s) choice. Finishing new house...basement in planning stages. HT will be open to bar/pool table area, not dedicated. Space is very large. The only "sure thing" about the setup are the speakers, 3 Triple 12HT for LCR, 4 Slanted 8HT for surrounds, and 2 Caps (2400). I am 75/25 music/HT, but LCR will still be put behind AT screen. Pre/pro to be determined.

Trying to figure out best amp(s) to power these incredible speakers. I've done so much research my head is spinning. I seem to recall a post where Jeff recommended Crest, QSC, and Lab Gruppen. I know there are some who love their consumer amps as well (RMK and his Sunfire). Seems I would need an entire rack of pro amps to power 7 speakers....and that's ok too. Fan noise and no 12V trigger concern me though. So many options....Emotiva, Crest, Lab, QSC, Crown, Sunfire, Parasound, Marathon, D Sonic, Wyred, ect...

For those of you with the wonderful JTR setups (RMK, Frohlich, ect), if you could start over with the above speaker setup...what would be your choice for amps?

Thanks for your input,
Chad

Originally Posted by SeaNile 

12db attenuators have been ordered.
Onkyo PRSC 886
Emotiva XPA-5
JTR triple 12LF for LCR
2 CHT SS-18.2 subs
inuke6000dsp amp
Crest CC4000 amp (for additional subs on their way)
4 SS-18.1 CHT soon to be added

Originally Posted by cshuff 

Greetings from Omaha,

Need input on amp(s) choice. Finishing new house...basement in planning stages. HT will be open to bar/pool table area, not dedicated. Space is very large. The only "sure thing" about the setup are the speakers, 3 Triple 12HT for LCR, 4 Slanted 8HT for surrounds, and 2 Caps (2400). I am 75/25 music/HT, but LCR will still be put behind AT screen. Pre/pro to be determined.

Trying to figure out best amp(s) to power these incredible speakers. I've done so much research my head is spinning. I seem to recall a post where Jeff recommended Crest, QSC, and Lab Gruppen. I know there are some who love their consumer amps as well (RMK and his Sunfire). Seems I would need an entire rack of pro amps to power 7 speakers....and that's ok too. Fan noise and no 12V trigger concern me though. So many options....Emotiva, Crest, Lab, QSC, Crown, Sunfire, Parasound, Marathon, D Sonic, Wyred, ect...

For those of you with the wonderful JTR setups (RMK, Frohlich, ect), if you could start over with the above speaker setup...what would be your choice for amps?

Thanks for your input,
Chad

Originally Posted by COACH2369 

I am getting close to becoming a JTR owner and I will be using a Sunfire TGA-7401 to power my speakers.

A fellow forum member on here was using an Emotiva XPA-3 when I heard a demo…..seemed to sound pretty good to me.

Everybody has a different “need” and “want” when it comes to picking an external amp…. Like Frohlich said earlier, these speakers really don’t need an amp to shine..

Originally Posted by Archaea 

I've never done any direct A/B comparisons for mains with the INuke (class D) vs. a traditional A/B or class H amp like the Crown, Emotiva, or EP4000. However there is some suggestion that the Class D amps cannot produce higher frequencies very well because the switching powersupply cannot switch fast enough to keep up with the top audible frequencies. I have a laymen's understanding of the tech so I'm not the right guy to go with for extra questions, but suffice to say most 'audiophiles' would say don't do class D for full spectrum audio listening. Class D is fine for subwoofers -- very efficient and clean, but there are some would would say stick to the more traditional "iron amps" for true discerning listening sessions. With that in mind - I ran a pair of Noesis to reference music levels on a T amp which puts out 20 watts per channel, and it sounded great. I agree that's it's hard to swallow spending $3 - $6K on speakers and then running them on an AVR with no amps. It's almost like I NEED to be thinking about running an expensive amp to compliment these expensive speakers --- whether you do actually need to or not would be an interesting subject for a blind listening test with a dozen AVSforum members.

I'll likely try to do that someday.

Put up an AVR's internal amp against a Crown XLS against an Emotiva -- maybe throw in my Inuke for good measure, and listen to a half dozen songs and move clips and see if anybody knows what's what? I've read that having lots of extra headroom can amount to better midbass and such --- it'd be fun to find out.

I'm neutral here --- no real expectation --- except that these JTR speakers can be driven with EXCEPTIONALLY little power in a typical home theater environment, and if an amp introduces noise or hiss - you are probably better of just letting your AVR's amp handle the goods at typical listening levels.

Heck, BlueSprings1 was playing at 15+ dB over Reference volume at his house on his JTR Triple Eights last time I was over there and they sounded great on just a Denon 4311 --- no external amp. How often you need to go to 15dB over reference I'll leave up to you. Sounded great OUTSIDE the house. Cause inside it was ear piercing LOUD.

That said --- i'd probably at LEAST want to try a high powered amp on the JTR equipment myself.

Originally Posted by N8DOGG 

The thinking that class D is bad is a laugh at best. It's a old wives tale from the time when class D was first introduced (when it did suck) It just isn't the case anymore and hasn't been for a long time now. The guys who poo poo it are likely older guys who are just dead stuck in A/B and A being the only options (my def of an audiofool). Same goes for DAC's, Analog, interconnects, speaker wire, cords and all the other garbage all the advertising try's to shove down all out throats. I'd put up my D-sonic ICE amp up against anything. I've had everything from pure class A, A/B, T and H. I use class D because of how light they are and the efficiency.

Originally Posted by logicators 

Guys,

I am going through the same dilemma. I recently picked up quintuple LCRs and currently driving them with my Marantz SR6005. The speakers are rated at 4 ohms and the AVR is rated at 8 ohms. I called Marantz before buying the speakers and they advised that the receiver is not rated at 4 ohms but it should be able to handle them as long as I don't go too loud and have good ventilation around the AVR.

I am thinking of picking up a Emotiva XPA-3 but not sure if I need to? Please share your thoughts.

Also audyssey currently sets my speakers at -9 so I will probably need to get attenuators if I go this route.

Another issue which someone else also pointed out: after running audyssey if I use a RadioShack SPL meter to measure the speaker level at my MLP, most of the speakers are close to 75 db but my S2 is set to about 65 db. I am not sure if it's some inaccuracy with the SPL meter (at low frequencies) or an audyssey bug. Should I really be bumping up the sub level by 10 dbs? Will I be running the sub 10 db hot if I do that?

Thoughts?

Originally Posted by cshuff 

Greetings from Omaha,

Need input on amp(s) choice. Finishing new house...basement in planning stages. HT will be open to bar/pool table area, not dedicated. Space is very large. The only "sure thing" about the setup are the speakers, 3 Triple 12HT for LCR, 4 Slanted 8HT for surrounds, and 2 Caps (2400). I am 75/25 music/HT, but LCR will still be put behind AT screen. Pre/pro to be determined.

Trying to figure out best amp(s) to power these incredible speakers. I've done so much research my head is spinning. I seem to recall a post where Jeff recommended Crest, QSC, and Lab Gruppen. I know there are some who love their consumer amps as well (RMK and his Sunfire). Seems I would need an entire rack of pro amps to power 7 speakers....and that's ok too. Fan noise and no 12V trigger concern me though. So many options....Emotiva, Crest, Lab, QSC, Crown, Sunfire, Parasound, Marathon, D Sonic, Wyred, ect...

For those of you with the wonderful JTR setups (RMK, Frohlich, ect), if you could start over with the above speaker setup...what would be your choice for amps?

Thanks for your input,
Chad

Originally Posted by cshuff 



As a generalization, seems like everyone is pretty happy with their choices of amplifiers....whether it be class A/B, D or H. Sifting through all the AVS threads on the topic, most people in general seem to have good things to say about the amps they have chosen for their repsective systems....which makes me think it really doesn't matter. I should have asked what amps/brand to avoid =).
Chad

Originally Posted by logicators 

Guys,

I am going through the same dilemma. I recently picked up quintuple LCRs and currently driving them with my Marantz SR6005. The speakers are rated at 4 ohms and the AVR is rated at 8 ohms. I called Marantz before buying the speakers and they advised that the receiver is not rated at 4 ohms but it should be able to handle them as long as I don't go too loud and have good ventilation around the AVR.

I am thinking of picking up a Emotiva XPA-3 but not sure if I need to? Please share your thoughts.

Also audyssey currently sets my speakers at -9 so I will probably need to get attenuators if I go this route.

Another issue which someone else also pointed out: after running audyssey if I use a RadioShack SPL meter to measure the speaker level at my MLP, most of the speakers are close to 75 db but my S2 is set to about 65 db. I am not sure if it's some inaccuracy with the SPL meter (at low frequencies) or an audyssey bug. Should I really be bumping up the sub level by 10 dbs? Will I be running the sub 10 db hot if I do that?

Thoughts?

Originally Posted by purbeast 

Just wondering if anyone knows exactly what size roundover router bit is used for the edges on the JTR speakers, specifically the T12 speakers?

I'm trying to make my stands match as close as I can to the look of the speakers. I measured and it LOOKS like it is 1/4" but just was wondering if anyone knew 100% what it was.

Originally Posted by Jedirun 

Once I set my subwoofer level to 75 db before running Audyssey, it sets it to plus or minus 1 db and it is still at 75 db on my analog RadioShack meter when c weighted and slow. When the pre-Audyssey level was about 10 db above reference, it would set my level really low, and my sub was 7-10 db below my LCR on the same meter.