Front loaded horn for my e145-8

[more10]

I always end up here searching for information on JBL equipment, so I though I might as well join. This is my first post.

I have a pair of e145-8 mounted in cabinets made from JBL 4530 plans. I got the cabinets cheap with the drivers.

Since 4530 have issues with intereference, I am planning to build straight front loaded horns instead. Since this is my first attempt at designing and building a horn I would appreciate any help I can get.

I have seen a lot of people complaining on the internet about cone breakup on 15" drivers. Is this an issue with the e145? At what frequencies will this happen?

The e145 has a light cone. How much compression will it be able to handle?

I will be using this horn in a hifi setup in my summer house (where I can play really loud), and at parties in the old granary.

I am using old Labgruppen PA amplifiers (LAB1000 for this driver), and electronic Linkwitz-Riley 24 dB crossovers. I will certainly push my drivers to their limits.

[Robh3606]

An E-145 would be the suggested replacement in a Hartsfield if you could not get a 150-4 up and running. In short it is capable of driving a corner loaded horn. I would not worry about it.

http://manuals.harman.com/JBL/HOM/Technical%20Sheet/D30085%20Hartsfield%20ts.pdf

http://www.audioheritage.org/html/profiles/jbl/hartsfield.htm

http://www.lansingheritage.org/images/jbl/reference/notes/tech1-3a/page07.jpg


Rob:)

[mikebake]

Something like a 4560?

[more10]

Something like a 4560?

Like 4560, but longer for lower cutoff. Horn part of these start dropping at 200 Hz, http://www.jblpro.com/pub/obsolete/low_frequency_enclosures2.pdf. Check out this thread: http://forum.speakerplans.com/jbl-4560-plans_topic12373.html, pictures of burning 4560s! From what I understand from other threads there is a phase problem with JBL designs because they are not front loaded, the 4560 and 4550 horns have ports. I want to build something with a closed rear chamber.

I will build a pair of Hartsfields when I retire :-).

[jcrobso]

They are large, which is why they get folded most of the time.
I have built C40 horns(smaller version of the 4530), I have build a set "K" corner horns and I own a set of 4560s, which I use for PA with a sub woofer.
Yes, I have seen that picture before.:shocking::(

[Hoerninger]

I want to build something with a closed rear chamber.

May be this thread gives some inspiration.
http://www.audioheritage.org/vbulletin/showthread.php?11909-Paragon-XXL&highlight=paragon+xxl
____________
Peter

[more10]

Maybe an Edgar 80 Hz horn? http://ftp.audioheritage.org/vbulletin/showthread.php?7402-Driver-choice-for-use-in-Edgar-mid-bass-horn!

Will it work? Work well?

[Robh3606]

Looks like it should but I would contact Bruce. With the extra thick frame and larger x-max you may need a spacer or 2 depending on clearance issues with the throat. Maybe not but it can't hurt to ask.

Rob:)

[more10]

Looks like it should but I would contact Bruce. With the extra thick frame and larger x-max you may need a spacer or 2 depending on clearance issues with the throat. Maybe not but it can't hurt to ask.

Rob:)

http://www.edgarhorn.com/

The site is not working. The new site is to be fully functional in january 2007! Does anyone know if Dr Edgar is still running his business?

[Robh3606]

Ask here. He is a regular and he will respond as well as other knowledgeable people. Just scroll down the page and you will see him on the forum.

http://www.audioasylum.com/forums/hug/bbs.html

Rob:)

[Earl K]

Hi,

RE; front loading your e145-8 .

- Consider following "volvotreters" lead in these matters .
- Just substitute your speaker for the EVM15L that he's currently using in his front loaded lo-mid horn .

- Click the pic ( to go to his web-site ) .

http://www.volvotreter.de/pics/Current_System2.jpg (http://www.volvotreter.de/new_system.htm)

<> cheers

[more10]

Ask here. He is a regular and he will respond as well as other knowledgeable people. Just scroll down the page and you will see him on the forum.

http://www.audioasylum.com/forums/hug/bbs.html

Rob:)

Thanks Rob!

http://www.audioasylum.com/cgi/vt.mpl?f=hug&m=151096

[more10]

I did a simulation in hornresp yesterday. Flat 110 dB/1W response from 60 Hz to 300 Hz, and then a 12 dB/octave drop above. This seems doable, but the upper end is a bit too low since I was planning to cross at 300. How close to upper knee can I cross the horn?

The difference between tractrix and conical in Hornresp was minimal. Will they sound equally good (or bad)? Building a conical horn will be much simpler though.