JBL Pro 3677 Have arrived!!! - Page 16 - AVS Forum
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post #451 of 479 Old 07-31-2014, 02:47 AM
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Originally Posted by Skylinestar View Post
@MKtheater , @cdy2179 , @pdxrealtor

Since you guys have the 3677, what's your thought on this:
Pro Cinema Speakers, the X-Curve, and other Target Curves at Home

If I wanna remove the X-Curve characteristic, is it as simple as this ?:
1 - remove 3677 internal crossover network
2 - wire up the Crown XLS amp directly to the LF element (woofer) and HF element (compression driver)
3 - set the Crown to bi-amp mode and set a HF crossover frequency. What is the ideal frequency to set?
4 - Listen and enjoy ? Any bad effects?
My Pioneer boosts the HF to its target eq curve which is higher highs than xcurve. Essentially overriding the 3677 xover.

My pioneer also has THX modes, which is basically x-curve with other affects.

If one just wishes to apply some x-curve the Pioneer has an x-curve adjustment (reduces the highs). It can't be used with THX modes as they both do similar things.

After auto EQ, without THX or x-curve applied, just using auto surround on a hd audio bluray the sound is too bright for me at higher listening levels. And thats where I like to listen - higher levels.

Same thing turning off eq, I no longer need the THX or x-curve because the 3677 xover is getting through.

Do some searching on THX mode and you'll see a mix of those who like and use it and those who don't. There is no shortage of guys who prefer the x-curve/THX mode or similar.

Im pretty sure the 3677 has been overhauled since the 70s.

The O. poster of that thread sounds like a Klipsch salesman. Haha.
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post #452 of 479 Old 07-31-2014, 05:51 AM
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Quote:
Originally Posted by pdxrealtor View Post
Im pretty sure the 3677 has been overhauled since the 70s.
Are you sure about this? The drivers could be the same, but how about the crossover network? Could you please ask the JBL tech team about this?

The 3677 PDF spec sheet at JBL is created on year 2000, modified on 2001, with a huge [PRELIMINARY] at the bottom right corner. Why is it [PRELIMINARY] ? I can't find any spec sheet with [PRELIMINARY] other than this 3677.
The Technical Manual PDF sheet is created and modified on 2012. The frequency response is not stated in the PDF though.
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post #453 of 479 Old 07-31-2014, 11:29 AM
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Quote:
Originally Posted by Skylinestar View Post
Are you sure about this? The drivers could be the same, but how about the crossover network? Could you please ask the JBL tech team about this?

The 3677 PDF spec sheet at JBL is created on year 2000, modified on 2001, with a huge [PRELIMINARY] at the bottom right corner. Why is it [PRELIMINARY] ? I can't find any spec sheet with [PRELIMINARY] other than this 3677.
The Technical Manual PDF sheet is created and modified on 2012. The frequency response is not stated in the PDF though.

lol - no. That's why I stated 'pretty' sure.

I'm also not sure if my statement about the AVR boosting the highs back up is correct. After thinking about it shouldn't matter how darn high the highs are boosted..... the xover should not allow them through, period.

I am sure my AVR gives most boost to the highs. I am sure that THX mode does cut out the highs.

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post #454 of 479 Old 08-02-2014, 12:48 AM
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Originally Posted by berstuck View Post
http://www.jblpro.com/www/support/contact

All the sales rep's numbers listed and the corporate office number listed. Good luck.
There's no email. Sigh.
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post #455 of 479 Old 08-19-2014, 12:47 PM - Thread Starter
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Your avr can boost the highs, the xcurve applies a curve that begins around 2k and slowly tappers down, UT of course you can boost to flatten the curve. Although as is It actually sounds great and it's not really noticeable. The 3677 had outstanding high end, very energetic and I never noticed anything missing. Music had the most energy and more powerful sound than anything I've heard.
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post #456 of 479 Old 08-20-2014, 07:11 AM
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Quote:
Originally Posted by cdy2179 View Post
Your avr can boost the highs, the xcurve applies a curve that begins around 2k and slowly tappers down, UT of course you can boost to flatten the curve. Although as is It actually sounds great and it's not really noticeable. The 3677 had outstanding high end, very energetic and I never noticed anything missing. Music had the most energy and more powerful sound than anything I've heard.
Will be shifting to my new house with a small 12'x11'x9' room. My screen is already 9 feet wide. I guess I'll ask my local installer on how to install these 3677 above my screen, tilted down.
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post #457 of 479 Old 08-20-2014, 08:18 AM - Thread Starter
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Is there anyway you can put an acoustic screen like Seymour xd in front of them? You could build one for $250 or so. You'd lose a foot of your room but its gonna be a pain trying to mount these above, these beast are big and heavy. And sitting that close the sound above the screen would be very localized.
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post #458 of 479 Old 08-21-2014, 09:13 AM
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Originally Posted by cdy2179 View Post
Is there anyway you can put an acoustic screen like Seymour xd in front of them? You could build one for $250 or so. You'd lose a foot of your room but its gonna be a pain trying to mount these above, these beast are big and heavy. And sitting that close the sound above the screen would be very localized.
I can't. I've already spent a lot on ambient-light rejection screen. Unlike many people who prefer better sound over video, I prefer a better video. The speaker will just sit on the floor below the screen, with lots of upward tilt.
Hopefully someone will make a killer ambient light rejection AT screen at low price in the next 15 year.

Last edited by Skylinestar; 08-21-2014 at 09:18 AM.
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post #459 of 479 Old 09-05-2014, 09:08 AM
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I've received my 3677 + 8340A + 2516 from my local distributor. The 3677 looks small to me...but still quite tall when placed below my non-AT screen...blocks part of my 16:9 screen.

The 2516 bracket doesn't come with any screws to attach it to the speaker. Is that normal? What kind of screw should I look for?
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post #460 of 479 Old 09-05-2014, 12:34 PM
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When will you have the fronts set up? I'm trying to decide on 3677s below the screen tilted like you or paying more and putting together an AT screen. Would be good to hear your impressions on if the sound is obviously coming from below (and if a 2nd row is blocked by the 1st row's heads)
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post #461 of 479 Old 09-06-2014, 10:57 AM
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Originally Posted by jparker36 View Post
When will you have the fronts set up? I'm trying to decide on 3677s below the screen tilted like you or paying more and putting together an AT screen. Would be good to hear your impressions on if the sound is obviously coming from below (and if a 2nd row is blocked by the 1st row's heads)
I have the left and right stacked above my pair of subs, flanking left & right of the screen. The center is below the screen though (and blocked part of my 16:9 screen). As MKtheater has said, these speakers will take some time to break in to sound sweet and slamming.

If you have more than one row of seating, try to stay away from floor placement as the speakers will be blocked.

Anyway, the screws for the 2516 brackets are the screws that are already installed on the 8340A. Neat.
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post #462 of 479 Old 09-12-2014, 06:56 AM - Thread Starter
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Quote:
Originally Posted by Skylinestar View Post
As MKtheater has said, these speakers will take some time to break in to sound sweet and slamming.

.

yea if you look back in my thread at the dates you'll see how long mine took. I ran them cranked while we were at work etc and ran bass test tones to break them in. They got smoother and smoother as time went on and ended up very smooth. The woofer broke in before the tweeter.

FWIW I have been testing out some QSC 2150s with basically the bass cabinet of the 3622/4622 (I installed some JBL m115-8a drivers). The 3677s woofer is superior with more slam, but the 2035hpl driver is a much better driver so it should sound better.
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post #463 of 479 Old 09-12-2014, 08:02 AM
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Quote:
Originally Posted by Skylinestar View Post
I have the left and right stacked above my pair of subs, flanking left & right of the screen. The center is below the screen though (and blocked part of my 16:9 screen). As MKtheater has said, these speakers will take some time to break in to sound sweet and slamming.

If you have more than one row of seating, try to stay away from floor placement as the speakers will be blocked.

Anyway, the screws for the 2516 brackets are the screws that are already installed on the 8340A. Neat.
Thanks for the info. I guess I'll just go AT and sit the 3677s on top of the two terraforms
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post #464 of 479 Old 09-12-2014, 08:17 AM
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Originally Posted by cdy2179 View Post
yea if you look back in my thread at the dates you'll see how long mine took. I ran them cranked while we were at work etc and ran bass test tones to break them in. They got smoother and smoother as time went on and ended up very smooth. The woofer broke in before the tweeter.

FWIW I have been testing out some QSC 2150s with basically the bass cabinet of the 3622/4622 (I installed some JBL m115-8a drivers). The 3677s woofer is superior with more slam, but the 2035hpl driver is a much better driver so it should sound better.
To break-in the 3677, do you switch off bass management in your AVR? Running the 3677 as large (or no crossover)? Or do you set the crossover to 40Hz to protect your receiver/amp?
@MKtheater , how do you break-in the JBLs when running WOTW? Full range with no crossovers too?
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post #465 of 479 Old 09-12-2014, 08:56 AM
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I broke them in with them set as I was going to use them, 80hz THX crossover. I played reference 4 times and done. They were very HF biased until those dual 15's kicked in. I thought I made a huge mistake but then they came alive.
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post #466 of 479 Old 09-12-2014, 09:42 AM - Thread Starter
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yeah I ran them full range to break in when I wasn't in the room or home. I also ran test tone sweeps down to 40hz and if you read this thread you know they shook the house like powerful subs. Because that had so much authority I ran them at 60hz crossover for a while.

What made them so insane was their ability to shake the room at even 100hz where every other speaker I've heard had little energy here. The rolloff to the sub was perfect. If you run 100hz-120hz through your sub you'll notice how powerful it is...the 3677 had that same powerful sound...that was something I had never heard.... that's truly keeping up with the subs and IMO that's what gives JBL their famous midbass.

Like I said above though the Cd took longer to break in. If you read the first 4 pages of the thread you'll see their progression. From September 30 to October 18th they were changing.

I also upgraded the insulation which soften their sound as well slilghtly..remember the 1.2k crossover means the woofer is handling half the vocals. The insulation JBL uses is crazy thin, I lined it with r13 like the 4pi and many other DIY speakers use.
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post #467 of 479 Old 11-14-2014, 07:48 PM
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So, how good are the 3677s? If I can afford them, are there better speakers for the price for a front stage? Planning on using an 12ft wide AT screen in a 24ft by 14ft room that has 8ft high ceilings.
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post #468 of 479 Old 11-14-2014, 10:33 PM - Thread Starter
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Better is really dependant on the person. The 15 it has hits harder than the dual 15s in the 4622.. It should as the 2035 is a much better driver than the M115H and in our rooms neither speaker is pushed anywhere near its limits. . Once it breaks in the horn is buttery smooth and images like crazy it's energy is crazy like the pro reviewer Andrew Robinson said "it charges the air" ... Yet of course it doesn't extend over 12k (which I never missed and I feel is no big deal). All in all for home theater it'll be hard to find anything really "better" it's a super fun easy to listen to bad ### speaker that can be found new for $600...

Currently I have 3 qsc 2150s (dual 15s) waiting for my new theater.. They image similar and mid bass is close to the 3677.... Until I have them in the new theater and in a baffle wall I can't really judge them.. But from the listening I've done... It's a toss up and the qsc 2150 is a much more expensive speaker on par with the jbl 4722. If I hadn't found the deal I did on the qsc 2150s I would definitely gone with the 3677....what it delivers in movies and the fun factor is insane and so far beyond consumer speakers it's crazy as is many of these designs.

In other words IMO you can't go wrong with them.
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post #469 of 479 Old 11-15-2014, 06:23 PM
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I wish I could find them for $600 each
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post #470 of 479 Old 11-15-2014, 07:25 PM - Thread Starter
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Quote:
Originally Posted by blee0120 View Post
I wish I could find them for $600 each
You can... Just call full compass and ask for someone who can give you a better price. I always ask them to look up my account and give me the guy who I bought my 3677 from (the ones I reviewed here), can't remember his name. They have always quoted to me from 590 to 599 never more....ive called probably 3 times over the last two years for them and various others most recently in August.

If you want something similar more on par with 4722.. I'm selling 2 of my 5 qsc 2150s really cheap still new, they're in the classified section. I've decided not to go imax style with 5 2150s and use qsc surrounds instead so I only need 3. I'm personally not a fan of jbl surrounds, tried 8340a and 8330a.

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post #471 of 479 Old 11-15-2014, 11:50 PM
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Like cdy said you'll have to make some phone calls. Notnyt posted the vendor he bought his jbl pro cinema speakers from in one of his threads as well. I picked up my 3252n from spectrum audio for $620 a speaker, and they are advertised at $800 right now. That was earlier this year so not long ago. Well worth it on a big purchase to call around.
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post #472 of 479 Old 11-16-2014, 10:36 AM
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Thanks guys. I will do
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post #473 of 479 Old 11-16-2014, 11:30 AM
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Originally Posted by berstuck View Post
Like cdy said you'll have to make some phone calls. Notnyt posted the vendor he bought his jbl pro cinema speakers from in one of his threads as well. I picked up my 3252n from spectrum audio for $620 a speaker, and they are advertised at $800 right now. That was earlier this year so not long ago. Well worth it on a big purchase to call around.
I saw your thread on the 3252s, thanks for providing information on then!

Can anyone provide feedback on how they compare to the 3677s?
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post #474 of 479 Old 11-16-2014, 03:02 PM
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I saw your thread on the 3252s, thanks for providing information on then!

Can anyone provide feedback on how they compare to the 3677s?
There's a lot less info on them since they are a newer speaker. I chose them because I listen to a lot of music and they roll off much higher up, about 6k if I remember correctly. I don't think for movies you can really go wrong with any of the jbl pro cinema line. They have a phenomenal reputation around here.
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post #475 of 479 Old 11-16-2014, 06:17 PM
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Originally Posted by berstuck View Post
There's a lot less info on them since they are a newer speaker. I chose them because I listen to a lot of music and they roll off much higher up, about 6k if I remember correctly. I don't think for movies you can really go wrong with any of the jbl pro cinema line. They have a phenomenal reputation around here.
I agree, they both look like great speakers. What kind of eq/room correction are you using?

Btw do the 3252s play lower having dual 15" woofers?
I've read the 3677s have great midbass slam and can provide a decent amount of bass even without a sub.
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post #476 of 479 Old 11-16-2014, 09:07 PM
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Both speakers will require a sub. I use Audyssey xt32 for eq. The midbass slam is amazing, it's honestly addicting. The 2 15's in the 3252n are for efficiency. The 3677 is slightly less efficient because of the single woofer, but it's a higher quality woofer.
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post #477 of 479 Old 11-18-2014, 08:46 AM
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Since my theater will only be used for movies, I'm sold on the JBL 3677 or 3252n. Whichever one I can get the cheapest for my lcr. Does not look like I can go wrong either way. I wasnt sure at first but I am now.
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post #478 of 479 Old 11-26-2014, 02:53 PM - Thread Starter
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Quote:
Originally Posted by Interspy24 View Post
I saw your thread on the 3252s, thanks for providing information on then!

Can anyone provide feedback on how they compare to the 3677s?
I can't quote on the CD but I can on the Woofers and I currently have 2 QSC bass cabinets (basically the exact same internal volume and tuning frequency as the 3252 cabinet) with dual JBL M115 drivers. This is The cheaper driver of the bunch and also used in JBLs cheaper PA speakers.

They both hit hard mid bass wise but the JBL 2035 in the 3677 sounds better and has a tad more slam, the second woofer in the 3252 only helps get the sensitivity up and isn't really needed at all in our rooms. You're also using these speakers well into the vocal range with the high crossover points in both speakers so a quality driver is a huge plus.

Google around about the 2035 and you'll see it's used in JBLs very high end cinema line as is the 2226 and is regarded by those who've used them to be a very nice speaker and used in many high end DIY builds like the 4pi. Is it as good as the 2226? for our use..I'd say it's pretty darn close. You won't find the M115 in anything but the budget speakers (JRX for ex) and in the DIY world it's kinda frowned upon.

If you search the 4pi and my name, you'll see Wayne also used to use the CD driver too. He later went with the B&C because it was cheaper, just as smooth and higher response doesn't hurt.

I'm not meaning to dog on any speaker... I'm using the m115 drivers (crossed at 500hz though not 1300hz). They both have great midbass but I would put the 3677 a good bit above in this comparison, as for frequency response I feel it's a non factor. The fact they can both be had for about the same $$ and the 3677 has one less driver should tell you something about its components.

IMO if you want to upgrade above the 3677 (bass driver wise) you're looking at the 4722N/3722N with the dual 2226 drivers. But I would bet the 3677 (in our rooms) would be able to give even those a run for their money as in that scenario it would be 1 high end driver against 2 high end drivers and neither speaker would be straining at all. Of course overall I'd expect the 4722n to come out on top due to the much larger waveguide and lower crossover point.

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post #479 of 479 Old 11-26-2014, 02:59 PM - Thread Starter
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Quote:
Originally Posted by Interspy24 View Post
I agree, they both look like great speakers. What kind of eq/room correction are you using?

Btw do the 3252s play lower having dual 15" woofers?
I've read the 3677s have great midbass slam and can provide a decent amount of bass even without a sub.
I ran sweeps on both setups (3677 and dual m115 cabinet) to break them in (as you may have read way back in this thread). The 3677 is crazy down low and a single one shakes the room down to 50hz or so like a sub. The dual m115 drivers sound good but much less authoritative and not quite as . I had the 3677 in the theater, aimed outside for a birthday party, wherever they were.. it didn't matter they slammed and I got compliments, it wasn't some lucky spot in the room result.

Either speaker though ...you will definitely need a sub. However with the 3677 I was able to cross at 60hz and not lose anything at all. With the 3252...I'd probably stay at 80hz...actually other than playing around I'd leave either at 80hz.
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