JBL Sound Power Series
Printed From: Speakerplans.com
Category: General
Forum Name: Show Off Your Sound System
Forum Description: Show of your gear. Post pictures of your Sound System here...
URL: https://forum.speakerplans.com/forum_posts.asp?TID=108206
Printed Date: 26 March 2026 at 8:27pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: JBL Sound Power Series
Posted By: ChrisWard
Subject: JBL Sound Power Series
Date Posted: 30 November 2023 at 8:13am
|
HI All, So back in the 90s I went to Plaza show in Earls court, and heard these in a JBL sound booth....sounded great, I ordered 2 x 4756 (3 way Mid / High) and 2 x 4785 (2x15in TCB)  |
Replies:
Posted By: ChrisWard
Date Posted: 30 November 2023 at 8:15am
and now nearly 30+ yrs later I still have them...I don't do gigs anymore, so thought why not install them in my house...bit OTT I know buy hey i had them doing nothing |
Posted By: ChrisWard
Date Posted: 30 November 2023 at 8:18am
Rack with my Amcrons of the same year, with 4 way active X overs
|
Posted By: shaun1264
Date Posted: 30 November 2023 at 8:19am
| Very nice. I still have quite a few Sound Power series speakers including the 15" TCB subs and two pairs of the 4726a 'baby bum' |
Posted By: ChrisWard
Date Posted: 30 November 2023 at 8:20am
| I have another pair of 4785's (later versions with the VCG drivers) and a pair of 4750 the tall version of the 4756 |
Posted By: ChrisWard
Date Posted: 30 November 2023 at 8:22am
These in the Savoy in London |
Posted By: ChrisWard
Date Posted: 30 November 2023 at 8:23am
Boulters Lock in Maidenhead |
Posted By: ChrisWard
Date Posted: 30 November 2023 at 8:25am
Goodwood House |
Posted By: ChrisWard
Date Posted: 30 November 2023 at 8:31am
Jesus College |
Posted By: luton_soundman
Date Posted: 30 November 2023 at 9:29am
Would you ever sell the 4750s? I always wanted some but never managed to get my hands on any 😫😫😫 ------------- Sound Hire/Sales new/used equipment. |
ChrisWard wrote:Posted By: Bams
Date Posted: 30 November 2023 at 10:27am
| There are some 4756’s for sale in the netherlands. At 1900 euro quite a steep pricing though. |
Posted By: bob4
Date Posted: 30 November 2023 at 12:22pm
Mate has 6 x 4756 cabs and most of the components that go in for sale in Germany if anyone is interested....... pricing would be a lot less than 1900, but also a fair amount of diy involved for the buyer 
|
Posted By: ChrisWard
Date Posted: 30 November 2023 at 12:55pm
 send a DM, no idea what they are worth now
|
Posted By: ChrisWard
Date Posted: 30 November 2023 at 12:59pm
Google might help me |
Posted By: luton_soundman
Date Posted: 30 November 2023 at 4:56pm
Yeah same, old and extremly HEAVY but great full range cabs. Are you based in the U.K? ------------- Sound Hire/Sales new/used equipment. |
Posted By: ChrisWard
Date Posted: 01 December 2023 at 7:50am
| I'm in France but I can bring them over if required....I come over 1 wk every month in the London area |
Posted By: mark4
Date Posted: 14 December 2023 at 4:31pm
|
Those JBL TCB cabs were a game changer to me in the early 90's and were my benchmark for many years . They had a 4 Stack of the 2x18's (4688's I think) installed in the Mean Fiddler below the Astoria. Standing in front during those sine wave drops from early Rave tracks made quite the impression! Despite having 18" fane XB scoops at the time, I couldn't believe how low the huge JBL's could go and still maintain a solid level.
Great memories. Respect due. |
Posted By: Andylaser
Date Posted: 14 December 2023 at 5:02pm
|
I recall reading an article about the Ministry Of Sound Tour that was sponsored by JBL and used the Sound Power series speakers. Apparently during a sound check, they blew the windows out in a university hall. ------------- "music so loud, that if we move in next door to you; your lawn will die" - Lemmy |
Posted By: shaun1264
Date Posted: 14 December 2023 at 6:40pm
|
Those TCB subs produce the best bass I've heard. I still vividly remember them installed in a few locations in the south of the UK. Very low distortion output from the opposing drivers that actually cancel out the harmonic distortion. This resulted in a problem though as many of these TCB subs were driven harder and harder as you simply couldn't hear the distortion effects . Blown drivers were common in these. Very low frequencies were easily produced at very high levels.
|
Posted By: colint
Date Posted: 16 December 2023 at 10:29pm
|
I had four of the 4726ap's with four of the 4745 2 x 15 reflex boxes under them all driven with bridged HH S500d's (one on each box) via a BSS FDS310 crossover ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: Lucasdude
Date Posted: 17 December 2023 at 4:20pm
|
Super rig, but I'm wondering how all those top HFs and MFs sound in that orientation? Love the amps, but swapping those Behringer units for some period appropriate quality items would really let the system shine imho. |
Posted By: mark4
Date Posted: 20 December 2023 at 10:11pm
If anyone has any interor / back-off pics of these cabs, I'd be very interested to see them  |
Posted By: FOO
Date Posted: 20 December 2023 at 10:26pm
|
https://forum.speakerplans.com/uploads/16834/JBL_4685_05.jpg
Not much to them. Just two huge chambers with one or two ports in each chamber depending on model. And a smaller center chamber with two ports. Four of these hooked up as surround subs in a "home cinema" setup is pure fun. Star wars pod racing gets a whole new level of entertainment Woop Woop Woop Woop!
|
Posted By: mark4
Date Posted: 21 December 2023 at 9:13am
|
Ah nice. I saw this photo on here before but didnt realise what I was looking at  .You say not much too them, but being interested in the driver mounting, I was expecting a different configuration. It's helpful to see how they actually are installed. So the smaller isobarik chamber arangement is opposed woofers in a common enclosure (4th order BP?), with the larger chambers being independently ported bandpass? Is there any signal filter circuitry or is it presumably all handled externally? I struggle to get my head around phase allignment in this system. How do the timings work between the out of-phase ports and drivers? I know its not magic, but it's certainly magical! And no port flaring? I've always been facinated by the isobarik arrangement (since the JBLs in fact) and why this configuration is not more popular. Many years ago I mounted a couple of 18's face-to-face and wired them into an old sealed test box I had and was impressed by the increasd depth and lower distortion from the same cabinet. Is it because of the material cost of needing the additional drive unit? Or is the critical complexity of getting the ports and chamber volumes designed correctly? In any case the JBL sub would seem to offer more extension, output and lower distortion than an equivalent volume dual reflex bin? |
Posted By: HilltopClub
Date Posted: 21 March 2024 at 11:18am
|
Ahh, the 4750!!! I used to have those in my old rig, bloody lovely speakers, weighed a ton haha but sounded great. Are there any about for sale these days? |
Posted By: boots-hifi
Date Posted: 23 March 2024 at 3:05pm
| I'm after a pair of 4732a if anyone knows of any please pm me. |
Posted By: MPO
Date Posted: 25 October 2024 at 6:58pm
| C'était un système fabuleux qui sonnait superbement bien. Du trés beau made in USA. |
Posted By: boots-hifi
Date Posted: 14 November 2025 at 1:16am
| I managed to find a pair of 4752As, which I'm currently in the middle of completely refurbishing. If you look at my previous post, it took 14 years to find a pair! The plan is to run them 3-way via 2 x Crest 4001s and 1 x 7001 on the 2206 via an OmniDrive. Also in my possession are 4 x 4782A unloaded, if anyone is interested. These were purchased prior to the 4751As and therefore need a loving home. As I've said, I can post some images if anyone's interested. One of the cabs reads serial number 0003, which excites the geek within me. |