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View Full Version : These JBL 3678 theater speakers are interesting



Tom Brennan
02-15-2007, 09:28 AM
http://www.performanceaudio.com/cgi/product_view.cgi?products_id=1255


These just have to sound good and might be the best $2000 one could could spend on new turnkey speakers today. If I were in the market for speakers I'd be thinking real hard about these, Hell, I am anyway.

I could put these in the HT and move the Nineteens down to the frontroom......

Zilch
02-15-2007, 11:11 AM
Tom - you could build those yourself in a better-looking integrated package for less, as several other members have similarly. I'm thinkin' John W, Hamilton, others.

I sure like the concept of biradial "ambience" for home theater; 2226H wouldn't be my woofer of choice, tho. Those guys built with LE14s:

http://audioheritage.org/vbulletin/showthread.php?t=9695

http://audioheritage.org/vbulletin/showthread.php?p=82907#post82907

I think it was Subwoof built the originals out of L220s [poetic justice, Tom, ;) ] though I'm not finding that link right now.

If $2000 is your budget, you could step up to Be-diaphragm 2435s on PT wavegudes, too....

grumpy
02-15-2007, 01:11 PM
orig post did say "new" and "turnkey", but unless one needs that shallow profile (might indeed) there are other JBL options that may entail different tradeoffs, still within that price
range 4622N is about the same price (B&H Photo), for example. DIY w/new or used
parts is another story...
:)
-grumpy

Zilch
02-15-2007, 01:46 PM
$2000 is "Mighty Good" two-way DIY territory.

[I obviously don't know what "turnkey" means anymore.... :thmbsup: ]

*****

Anybody know what the "o" means on the inductors? Is that the outside of the winding?

http://www.jblproservice.com/pdf/Theatre%20Series/3678LF.pdf

grumpy
02-15-2007, 02:41 PM
Anybody know what the "o" means on the inductors? Is that the outside of the winding?


normally a "dot" would indicate relative polarity for coupled inductors or a transformer
winding... since these appear to be independent inductors, it may simply be for
assembly purposes, as I believe you are suggesting. -grumpy

spkrman57
02-22-2007, 02:22 PM
I sure like the concept of biradial "ambience" for home theater; 2226H wouldn't be my woofer of choice, tho.

Actually I'm looking at building a system using the following items I have inhouse: 2226J/2426J/2344/3677 cabinet

I think it was Subwoof built the originals out of L220s [poetic justice, Tom, ;) ] though I'm not finding that link right now.

That was another option I have since I have 2235H/L200 cabs



When I had my 4430's, they were not tube friendly with my SE amps running less than 10 wpc. So I thought someday I would use the 2226 as it is just effecient enough for my tube amps to run.;)

Will be in the future as I am busy with other things right now that can't wait.

Regards, Ron

Robh3606
02-22-2007, 03:47 PM
Anybody know what the "o" means on the inductors? Is that the outside of the winding?

They are cored inductors. They are wound on a ferrite or iron core.

Rob:)

Thom
02-22-2007, 04:42 PM
They are cored inductors. They are wound on a ferrite or iron core.

Rob:)

From my experience the core is indicated by the lines next to the turns. I have never seen the "O" before.

Zilch
02-22-2007, 04:44 PM
Solid core versus laminated core, maybe....

demon
02-07-2009, 03:35 AM
hey!

i just stumbled over the 3678 speakers on a german website, and they sell for 1364€.
i tend to think that thats not bad at all, comparing to hifi-products in the same price range. now, what would i do with this speakers?
i would turn the box upside-down, put in a 1o" jbl midfrequ.driver (like 2123) and conrol it, of course, digitally active. close the bassreflex, and compensate it with solid power.
could work!

heres the picture of the original, just imagine the 15" swapped to the bottom and a 1o" above it (maybe imagine blue paint on the baffle, too...).
http://www2.jblpro.com/BackOffice/ProductPictures/de2d7ba2-6a09-4973-9d00-03403ee427ec.jpg

cheers,
mikey

Mr. Widget
02-07-2009, 09:32 AM
i just stumbled over the 3678 speakers on a...I really don't see the appeal. It is a 4430 with a bit higher sensitivity but it gives up bass extension and linearity. Maybe for a theater where loud is key and you will be using subs anyway, but...


Widget

Hamilton
02-07-2009, 02:40 PM
...but it gives up bass extension and linearity.

Which is exactly why I didn't go that route.

Tom Brennan
02-07-2009, 03:29 PM
I really don't see the appeal. It is a 4430 with a bit higher sensitivity but it gives up bass extension and linearity. Maybe for a theater where loud is key and you will be using subs anyway, but...


Widget


I'll betcha they'd pass the Ben-Hur test with flying colors.

I'm listening to CS-3115s with 2226 woofers now, the box isn't that large and the bass is very satisfying to me. If you want to buy something, rather than make something, it seems a simple, cheap and reasonable way to go.

On the other hand I'm just a'guessin' ya understand, having never heard them.

robertbartsch
02-07-2009, 03:55 PM
I have a pair of speakers in one HT system that has 2226, 2426, and slots that is very nice.

JBL 4645
02-07-2009, 04:13 PM
Just used Google Product Search and found this site.
http://www.mt247.co.uk/acatalog/JBL.html (http://www.mt247.co.uk/acatalog/JBL.html)

demon
02-07-2009, 09:28 PM
I really don't see the appeal. It is a 4430 with a bit higher sensitivity but it gives up bass extension and linearity. Maybe for a theater where loud is key and you will be using subs anyway, but...


Widget

true of course, but it might be just right for someone who cant wait for 443o to turn up or hasnt got the nerve to mess with used or maybe worn-out monitors.
what got me thinking was the space left on the baffle wich seems just right to put in a decent mid-frequency driver. the 1o" jbls are no longer available (new) as i see it, so one could use a nice nice PHL mid, could be even smaller, 8" or something.

what got me thinking about this was that i didnt know that the horns+drivers where still available (new), and i think this speakers are the only way to get them?
and i really like the looks of the 3678. looks frankensteinian.

cheers,
mikey

mikebake
02-08-2009, 06:11 AM
I'm listening to CS-3115s with 2226 woofers now, the box isn't that large and the bass is very satisfying to me.
Hi Tom;
Vocals are nice on the 3115's, eh? Funny thing is, after all the run-ins with Romy over the years, he actually said on his website that they were the first sound reinforcement speaker he'd heard that were passably hi-fi, when he heard them in a club.
The speakers he used to slam, he inadvertently liked later. He heard them in SRX4735 guise.
I sold my 4 off this past summer, but my buddy Dave still has a pair NIB in his garage in Colorado.
Are you using the stock crossover? I ended up ordering the SRX crossover for them so I could go all-passive.

mikebake
02-08-2009, 06:27 AM
That's funny, I googled it and see you had replied to him back when it was posted..............
http://www.goodsoundclub.com/GetPost.aspx?PostID=1399&Phrase=JBL

Tom Brennan
02-08-2009, 06:52 AM
Mike---I'm holding the speakers for a pal (you remember Kurt) who'd downsized when I'd upsized. Now my house is for sale (auction next weekend, best way to move a house in this market) and we're moving to a high-rise in downtown Chicago in March.

So I already sold my 19s, 605s and Boleros and soon will sell my AS-21s. It looks like I'll be going with Martin-Logan electrostats---small footprint and excellent clarity. IMO the only thing that can match horn clarity is an ES.

I've been getting used to the sound of my little KRKs again in preparation. ;) I wonder if JBL makes a first rate small speaker?

http://i254.photobucket.com/albums/hh92/Irishtom29/place029.jpg

JBL 4645
02-08-2009, 07:21 AM
Mike---I'm holding the speakers for a pal (you remember Kurt) who'd downsized when I'd upsized. Now my house is for sale (auction next weekend, best way to move a house in this market) and we're moving to a high-rise in downtown Chicago in March.

So I already sold my 19s, 605s and Boleros and soon will sell my AS-21s. It looks like I'll be going with Martin-Logan electrostats---small footprint and excellent clarity. IMO the only thing that can match horn clarity is an ES.

I've been getting used to the sound of my little KRKs again in preparation. ;) I wonder if JBL makes a first rate small speaker?

http://i254.photobucket.com/albums/hh92/Irishtom29/place029.jpg

You know JBL makes small compact beasts that will make any West Side Story sing or even Ben-Hur chariot race rumble in Cinerama glory.:bouncy:

I have both films and they sound pucker on my JBL set-up.

So what is that a HF horn with marzipan stuck to it?

mikebake
02-08-2009, 09:43 AM
;) I wonder if JBL makes a first rate small speaker?


Dunno, I'd imagine there is something. I never minded any decent smaller speakers if paired with good powered subs. In fact, somehow that combination often seemed more flexible and more easily integrated into a room than full-rangers did, being able to place each where it worked best, etc.

speakerdave
02-08-2009, 10:05 AM
. . . . Anybody know what the "o" means on the inductors? Is that the outside of the winding? . . . .

I hope so, since it's important information; the placement in the schematic follows the recommendation that the inside lead be downstream in series and toward the negative pole in parallel. The parallel lines indicate iron core. I don't find a symbol for laminate core. It's likely there are variations in these symbols.

Now, if we could just get DCR.

Mr. Widget
02-08-2009, 11:14 PM
I wonder if JBL makes a first rate small speaker?Their sister company Revel does... the M22. It is outstanding.

http://www.revelspeakers.com/products/product.asp?product=16


I never minded any decent smaller speakers if paired with good powered subs. In fact, somehow that combination often seemed more flexible and more easily integrated into a room than full-rangers did, being able to place each where it worked best, etc.:yes:

Perhaps the M22s with the Array 1500 sub... that would not be an inexpensive system, but it would be really magnificent... and moderate sized room friendly.



Widget

mikebake
02-09-2009, 04:38 AM
I'm just waiting for Tom to drag out the word chinless somewhere along the line...........:D

4313B
02-09-2009, 05:44 AM
Their sister company Revel does... the M22. It is outstanding.No doubt! Those little 6.5-inchers are the same size as my Tannoy DC's but probably quite a bit better.