Summertime JBL refurbishment the whole sound system!

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Dolby CP-200

Banned
"Raiders of the Lost Breezeblocks" a JBL 4645 LFE.1 experiment.


Had this rather interesting conversation with mate (down under) that says this technique has been down once before back in 1990 and much to my surprise I think it’s a wonder solution to tighten up the sub bass and give it a fast attack.

So here’s the deal I’ll grab a few more breezeblocks in a jiffy for an LFE.1 experiment in the morning as its too late here right now! I’ll need x3 for the task one for each end and one for the middle.

I won’t just go right into it I’d first test it out without the (breezeblocks) make notes of it, the way it feels! SPL db notes would be a little pointless as the unit will only be off the floor be as much as 4” but still I’ll take SPL db readings to use as guide reference.

Also I’ll plug the lead into the SPL db metres output and take RTA readings before and after.

While it may have improved the sub bass extension with tighter low end response and faster attack as that is what I noticed and I’ve had the darn thing in that position time and time again with the same thing having to turn it down slightly due to the sound waves vibrating the floorboards directly beneath the sub bass driver. That’s it beneath “What Lies Beneath” I haven’t tried that one out that’s got awesome low end that is supported over the range of channels mostly the threes-screen like when Norman puts his wife in the bathtub and the water level is rising above the overflow pipe with deep low end!

One other minor change I’d have to make is to the height of the JBL Control 5 right channel it’s going to up by 4” and I’d have to figurer a way of getting it within a few millimetres.

Okay time to garb a few breezeblocks before someone else garbs.:D

I kinder feel like Indiana Jones “Raiders of the Lost Breezeblocks.”

Oh yeah I’ll try that scene out with the bolder rolling down the cave.:p
 
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D

Dolby CP-200

Banned
Well that didn’t take long and yes I encountered spiders but no snakes:D, slugs yes and one centipede and I hate bugs.:eek::D

Well before bring those breezeblocks in I cleaned them down with broomstick and its just struck me, I’m going to need some type of carpet or other to place over or around the breezeblocks before I start moving the JBL 4645 on top them as I don’t what to damage the surface!
 

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D

Dolby CP-200

Banned
Well I now have some cardboard and I can go ahead with the project sometime today, it was easy after spotting the (ISS) passing overheard only 10 minutes ago heading (southeast) out towards Europe and after showing a girl at the (Co-Op) I then asked for some cardboard and look what I got yes this is more than enough.:)

 
D

Dolby CP-200

Banned
Okay here’s the order of what I’m going to do today.

First make a sandwich and do secondary brainstorming before I tackle the project. I’ll need to check out at least a few films on DVD and laserdisc as it is presently, then start moving the JBL control 5, right channel out of the way and then move the JBL 4645 to the middle of the room where I’d then start cutting the cardboard to size for installation on the floor making sure to undo the cable.

Next place the breezeblocks into position and then cover the tops with cardboard to prevent the JBL 4645 getting scratched.

Next is to move the JBL 4645 into position and tilt it back slightly so that I can get the back end on the breezeblock supports. Slide it up into position connect the cable to the JBL 4645 and then place the JBL control 5 back into place, only I’d have a new problem and that is the height? I’d have to make some adjustments to get it within the same height as before and that will take an extra bit of time and thinking, besides I’ve been in this situation before, no worries.

Once its all done and ready to go its all trail and error to see if the breezeblocks make any or differences to the JBL 4645 not that I’ve had any difficulties with it in that location and unlike the other sub where the driver is facing downwards towards the floor within 2” the JBL 18” sub bass driver is mere 4” away from the floor or it may sound better being clear by 4” or it may sound the same worse but I hardly doubt worse. So that’s the plan I have drawn out I’ll get a little kip at the moment and then processed with the experiment in a few hours time.
 
emorphien

emorphien

Audioholic General
So how many empty boxes do you have sitting on top of that sub rattling around?
 
D

Dolby CP-200

Banned
So how many empty boxes do you have sitting on top of that sub rattling around?
More then enough more than enough.:D

Oh well I’m back and I’m tired after humping that huge monolith of 2001 odyssey JBL 4645 sub onto those breezeblocks, well it was easy the cardboard made it slide onto them and its kinder added a slight impact with X-Men II The Last Stand when Jean uses her powers to suspend objects until it all came down to thundering SLAM!








I believe the frequency response is down to 25Hz on X-Men II when that house slams into the ground as well as most part of film. It hit at 112dbc in the middle and that was more than enough comfortable without being overwhelming.



At the moment I’ve got summer hit from 1999 The Mummy playing chapter 5 when “Rick” busts in to save “Evelyn” his voice his heard from the left sidewall surround array and partly the front its then accompanied by some crazy LFE.1 pounding on my body.
 
emorphien

emorphien

Audioholic General
I'm still confused about why you have empty speaker boxes all over the place, particularly on your sub.
 
D

Dolby CP-200

Banned
I'm still confused about why you have empty speaker boxes all over the place, particularly on your sub.
Well think about what do you see you see three matching JBL Control 5 placed at the same height and since I haven’t built the platform for them to set on along with the vertical assembly wall or lets just call it the THX baffle wall, no I haven’t had the time to getting round to do that as of now but it might be up soon without notice.:p

The other two enclosures placed to the left-hand side will be used for some propose soon maybe I’ll use them for, for well I have no idea they would be well suited with some 6 ½ bass mid JBL I’ll use the original HF drivers that they came with and maybe I’ll just use them as and well when I’m in a happy mood.:)
 
D

Dolby CP-200

Banned
You should really get a new tv.
LOL, Yeah you don’t say:D well maybe I should get brand new video projector:p as TV monitors really mess up home cinema by taking up nearly 4 or 6 feet of space for proper matching loudspeaker placement. I know what I’m doing and thou I’m not stinking rich like some I’m very patient at waiting. All good things come to those who wait.:)

Well at least I have my sub bass priorities right.:p:p
 
Gimpy Ric

Gimpy Ric

Moderator
I think James B. Lansing should hire some thugs and torch the entire flat.
 
Wafflesomd

Wafflesomd

Senior Audioholic
Hey dolby.

You should just get some stands for your speakers. Work on some room placement and clean things up.

IDK why you get so much crap for this. If you like the sound, you like the sound. Can't argue with that.
 
croseiv

croseiv

Audioholic Samurai
Yep, that's one impressive array of speakers for sure!
 
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