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JBL Sound Power Series |
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ChrisWard 
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Joined: 24 September 2008 Location: France Status: Offline Points: 46 |
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 Posted: 30 November 2023 at 12:55pm |
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 send a DM, no idea what they are worth now
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ChrisWard
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Joined: 24 September 2008 Location: France Status: Offline Points: 46 |
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Posted: 30 November 2023 at 12:59pm |
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Google might help me |
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luton_soundman
Old Croc 
Joined: 03 August 2010 Location: Bedfordshire Status: Offline Points: 4550 |
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Posted: 30 November 2023 at 4:56pm |
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Yeah same, old and extremly HEAVY but great full range cabs. Are you based in the U.K?
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Sound Hire/Sales new/used equipment.
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ChrisWard
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Joined: 24 September 2008 Location: France Status: Offline Points: 46 |
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Posted: 01 December 2023 at 7:50am |
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I'm in France but I can bring them over if required....I come over 1 wk every month in the London area
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mark4
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Joined: 27 November 2023 Status: Offline Points: 24 |
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Posted: 14 December 2023 at 4:31pm |
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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. Edited by mark4 - 14 December 2023 at 5:03pm |
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Andylaser
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Joined: 16 April 2010 Location: Southampton Status: Offline Points: 392 |
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Posted: 14 December 2023 at 5:02pm |
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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.
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"music so loud, that if we move in next door to you; your lawn will die" - Lemmy
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shaun1264
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Joined: 06 September 2013 Location: Surrey Status: Offline Points: 325 |
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Posted: 14 December 2023 at 6:40pm |
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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.
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colint
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Joined: 06 October 2007 Location: United Kingdom Status: Offline Points: 5260 |
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Posted: 16 December 2023 at 10:29pm |
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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
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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!
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Lucasdude
Young Croc 
Joined: 16 March 2013 Location: London Status: Offline Points: 986 |
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Posted: 17 December 2023 at 4:20pm |
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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.
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mark4
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Joined: 27 November 2023 Status: Offline Points: 24 |
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Posted: 20 December 2023 at 10:11pm |
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If anyone has any interor / back-off pics of these cabs, I'd be very interested to see them
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FOO
Young Croc
Joined: 23 December 2018 Location: Denmark Status: Offline Points: 949 |
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Posted: 20 December 2023 at 10:26pm |
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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!
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mark4
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Joined: 27 November 2023 Status: Offline Points: 24 |
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Posted: 21 December 2023 at 9:13am |
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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? |
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luton_soundman wrote: