Speakerplans.com Homepage
Forum Home Forum Home > General > General Forum
  New Posts New Posts RSS Feed - Info/ help needed with jbl mpro mp415 comps
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Info/ help needed with jbl mpro mp415 comps

 Post Reply Post Reply Page  12>
Author
Message
charlysays View Drop Down
Registered User
Registered User
Avatar

Joined: 16 June 2015
Location: Wales
Status: Offline
Points: 413
Post Options Post Options   Thanks (0) Thanks(0)   Quote charlysays Quote  Post ReplyReply Direct Link To This Post Topic: Info/ help needed with jbl mpro mp415 comps
    Posted: 13 August 2017 at 9:25pm
I've been after some alright sounding compact tops for a while so I got a pair of mp415s today for 240 quid.

In investigation of a cab rattle (turned out to be a loose comp, I got money off due to it too) I have discovered that the comps are certainly not original unfortunately.

The magnet structures have nothing to identify them by expect a sticker. One says A4W-JBF and the other says 94X-JBF.

I assume these are jbl magnets but are they the correct ones? They look identical apart from having different numbers on the stickers.

The diaphragms have no name on them so I assume they're aftermarket replacements.

How much worse are they going to sound?

How much would it cost to put them back with original jbl as they should be?

How do I tell which pole is which... No plus or minus that I can find.

Lastly I accidentally got the two magnet assemblies stuck together, have I damaged them? I didn't expect them to attract for some reason!

I'm unfamiliar with anything regards comps as I've never blown one and only built subwoofers so far so this is new territory for me.

The woofers are atleast original and seem fine

Any advice much appreciated
Back to Top
MarjanM View Drop Down
Old Croc
Old Croc
Avatar

Joined: 10 February 2005
Location: Macedonia
Status: Offline
Points: 7810
Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 14 August 2017 at 12:52am
Pictures please

Marjan Milosevic
MM-Acoustics
www.mm-acoustics.com
https://www.facebook.com/pages/MM-Acoustics/608901282527713
Back to Top
djeddie View Drop Down
Old Croc
Old Croc
Avatar

Joined: 26 April 2004
Location: Bristol
Status: Offline
Points: 4125
Post Options Post Options   Thanks (0) Thanks(0)   Quote djeddie Quote  Post ReplyReply Direct Link To This Post Posted: 14 August 2017 at 10:15pm
The comp should be a JBL 2406H. Just Google that and look at the pics, if they're the same then that's whatcha got... if not, they've been changed.
Chas n Dave : it's like Drum and Bass but with beards.             E=mc² ±3dB
Back to Top
_djk_ View Drop Down
Old Croc
Old Croc


Joined: 23 November 2004
Location: United States
Status: Offline
Points: 6002
Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 15 August 2017 at 12:08am
"A4W-JBF and the other says 94X-JBF."

Production codes for a JBL compression driver.

http://www.jblproservice.com/pdf/MPro%20Series/MP415.pdf




Will accept a genuine BMS 4538 diaphragm (about $65 in the USA, $140 with the JBL sticker).


Edited by _djk_ - 15 August 2017 at 12:11am
djk
Back to Top
charlysays View Drop Down
Registered User
Registered User
Avatar

Joined: 16 June 2015
Location: Wales
Status: Offline
Points: 413
Post Options Post Options   Thanks (0) Thanks(0)   Quote charlysays Quote  Post ReplyReply Direct Link To This Post Posted: 15 August 2017 at 10:44am
Originally posted by MarjanM MarjanM wrote:

Pictures please







Both magnets are identical apart from the differing stickers.

The screws are part out because whoever messed with these had rounded some of them so I got new machine screws and replaced them all before refitting.
Back to Top
charlysays View Drop Down
Registered User
Registered User
Avatar

Joined: 16 June 2015
Location: Wales
Status: Offline
Points: 413
Post Options Post Options   Thanks (0) Thanks(0)   Quote charlysays Quote  Post ReplyReply Direct Link To This Post Posted: 15 August 2017 at 10:46am
Originally posted by djeddie djeddie wrote:

The comp should be a JBL 2406H. Just Google that and look at the pics, if they're the same then that's whatcha got... if not, they've been changed.


Cheers. I did gather that from the jbl tech sheet however there are no stickers on my comps... However they do look like 2406s so I guess they probably are the original motor units just with no name diaphragms fitted.
Back to Top
charlysays View Drop Down
Registered User
Registered User
Avatar

Joined: 16 June 2015
Location: Wales
Status: Offline
Points: 413
Post Options Post Options   Thanks (0) Thanks(0)   Quote charlysays Quote  Post ReplyReply Direct Link To This Post Posted: 15 August 2017 at 10:48am
Originally posted by _djk_ _djk_ wrote:

"A4W-JBF and the other says 94X-JBF."

Production codes for a JBL compression driver.

http://www.jblproservice.com/pdf/MPro%20Series/MP415.pdf




Will accept a genuine BMS 4538 diaphragm (about $65 in the USA, $140 with the JBL sticker).




Thanks. Do the differing codes mean I have two different motor units despite them being externally identical bar the code on the sticker?

So best cheap bet for optimal sound quality is a bms diaphragm?

Thanks for this.

I looked these BMS drivers up... what is the difference between the diaphragms for the BMS4540 and the 4538?... They look the same and seem to both be suited to the JBL2406....
4538 is quite a lot cheaper. Is it just a ferrite version of the 4540?


Edited by charlysays - 15 August 2017 at 12:14pm
Back to Top
_djk_ View Drop Down
Old Croc
Old Croc


Joined: 23 November 2004
Location: United States
Status: Offline
Points: 6002
Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 15 August 2017 at 11:37pm
" Do the differing codes mean I have two different motor units despite them being externally identical bar the code on the sticker? "

They are like date codes, or serial numbers, same part, different time off the line.

"So best cheap bet for optimal sound quality is a bms diaphragm? "

Yes.



"I looked these BMS drivers up... what is the difference between the diaphragms for the BMS4540 and the 4538?... They look the same and seem to both be suited to the JBL2406....
4538 is quite a lot cheaper. "

The 4538 is less expensive due to higher production volume.

"Is it just a ferrite version of the 4540?"

Pretty much.
djk
Back to Top
charlysays View Drop Down
Registered User
Registered User
Avatar

Joined: 16 June 2015
Location: Wales
Status: Offline
Points: 413
Post Options Post Options   Thanks (0) Thanks(0)   Quote charlysays Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2017 at 12:12am
Thank you djk very much appreciated. I'll get some tomorrow ☺
Not only do these no name diaphragms have no name but also no plus or minus so simply getting that right will be nice!

On that note, do I connect the yellow and black to the positive or the yellow? I take it a bms diaphragm won't have that confusing reverse polarity like other jbl drivers?
Back to Top
_djk_ View Drop Down
Old Croc
Old Croc


Joined: 23 November 2004
Location: United States
Status: Offline
Points: 6002
Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2017 at 1:16am
Yellow goes to positive.
djk
Back to Top
charlysays View Drop Down
Registered User
Registered User
Avatar

Joined: 16 June 2015
Location: Wales
Status: Offline
Points: 413
Post Options Post Options   Thanks (0) Thanks(0)   Quote charlysays Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2017 at 9:39am
Originally posted by _djk_ _djk_ wrote:

Yellow goes to positive.


Thanks again.. And they're 8ohm drivers?
Can't find multimeter to test the old ones atm!
Back to Top
_djk_ View Drop Down
Old Croc
Old Croc


Joined: 23 November 2004
Location: United States
Status: Offline
Points: 6002
Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 17 August 2017 at 10:02pm
The 'H' indicates an 8Ω driver.
djk
Back to Top
 Post Reply Post Reply Page  12>

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.06
Copyright ©2001-2023 Web Wiz Ltd.

This page was generated in 0.141 seconds.