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Old 1st May 2010, 01:54 PM   #1
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Default JBL 4530 Replica

I've build some new JBL 4530 replicas with Precision Devices PD154. Deep loud bass coming out. Have only left to sand and color it down.

Here some pics.
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Old 1st May 2010, 06:34 PM   #2
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Nice...really nice.. Your system is kinda like what I'm looking for.Ultra High Db levels...as I am making a tube amp with only 2.2 Watts worth of output power.
Do you have some specifics we can all mull over???? Have you done some Qtc calculations?? SPLs' ???
I believe I recognize that HF driver from the Partsexpress listings....The 106 Db 'tweeter' in the "pro-sound" sections.

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Old 2nd May 2010, 07:12 AM   #3
djk is offline djk
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"Deep loud bass"

Show me the measurements.

No deep bass out of a 4530, it's too short.
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Old 2nd May 2010, 09:08 AM   #4
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It's not 20 hz.. They are usable from 35Hz placed at wall @ 36 Hz is whole house shaking. PD's154 has a nice Xmax (7.7mm).

Here's predicted response.
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Old 2nd May 2010, 09:18 AM   #5
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Sure it's not 20Hz.. indeed I have no music with such low notes.
Usable from 35Hz placed at wall @ 36Hz whole house rattles.

Here's predicted response.
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Old 2nd May 2010, 09:24 AM   #6
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Under the horn path lenght, horn works like a bassreflex/transmission line.
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Old 2nd May 2010, 01:13 PM   #7
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by djk View Post
..No deep bass out of a 4530, it's too short..
Agree, See the quick ‘clone’ simulation= Picture (1) and the picture (2) where the PD.154 driver is used too for bass but IMO a sub bas should have at least similar performance to the in picture shown Eminence-Definimax-18LF driver.

b
Attached Images
File Type: jpg JBL-4530_clone_using-PD.154.JPG (195.9 KB, 69 views)
File Type: jpg PD.154-bass.JPG (628.2 KB, 72 views)
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Old 2nd May 2010, 01:47 PM   #8
bjorno is offline bjorno  Sweden
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Hi all,

Sorry, I posted pictures with bad PD.154 T/S data,Ill be back soon with new pictures.

b
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Old 2nd May 2010, 02:21 PM   #9
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@bjorno; not only PD154 data, your other calculations are way off too.. (VTC, ATC, S1, horn lenght..!?)
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Old 2nd May 2010, 06:25 PM   #10
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by JRjunior View Post
@bjorno; not only PD154 data, your other calculations are way off too.. (VTC, ATC, S1, horn lenght..!?)
Hi,

Here are the revised pictures (correcting the T/S data):..

My ‘bad’ PD.154 data was consistent with the larger than in reality Mms that only scaled down the SPL not the performance more than marginally.

I don’t think my simulations are way off at all. You’ve simulated a ND but this particular speaker is practically IMO, an OD Horn.

I choose the OD template because the picture I submitted of the original depicts an offset driver and not uniquely a separate compliance chamber.

The first smallest CSA radius at the very first bend is about 10 cm i.e. the CSA would be 10 x 56.5 = 565 cm but starts shrinking conically from the CSA=16.8 x 56.5= 898 cm^3: (21.6-3.8-1.9 = 16.8) cm).

The more sections and CSA’s the (OD) horn uses, is IMO more closer to the original than a perfect exp expansion but you may have followed your own simulation very closely but that’s completely another issue.

b
Attached Images
File Type: jpg JBL-4530_clone_using-PD.154-rev.JPG (526.8 KB, 67 views)
File Type: jpg PD.154-bass-rev.JPG (793.8 KB, 60 views)
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