Gaining access to REGA ELA Crossover.

[JimC]

Hi,

does anyone know how to get access to the Crossover Network in the REGA ELA Loudspeaker?
Mine are MK II versions but I suspect they're all the same basically.

I removed the Bass Drivers a long time ago when investigating my Amp going into Protection Mode and suspected an int't short turn on a Woofer, turned out it wasn't. However I seem to remember there was no sign of the Crossover behind the Driver.
The Binding Post Panel looks too small to have any circuitry mounted on it internally.

I am thinking about possibly upgrading the component/s (I know it's supposed to be a minimalist network!).

Any help appreciated.

Jim.

[system7]

I think it's likely to be on the back of the speaker plug connection socket, Jim. Common enough.

http://www.roydaudio.org/models/rega-ela/

Nice old Scanspeak D2008 tweeter, bit like a Hiquphon OW1. But they are hard to get into to replace ferrofluid, IIRC. Hacksaw job!

http://www.wilmslow-audio.co.uk/scan...8512-231-p.asp

I found a picture of what looks like a simple bass coil, and second order tweeter CL filter.

Is it a 6" paper bass? Must be a bit like an efficient old SEAS Greencone: http://www.troelsgravesen.dk/greencones.htm

6" paper bass is not an easy speaker to do, and simple crossovers don't work all that well, because 6" bass has some breakup problems at 5kHz. Simplest thing you can do is something like a 1.8mH coil and a 6.8uF shunt capacitor, crossover about 2.5kHz to second order tweeter.

[Scooby]

It's on the back of the plastic terminal housing. The board is a bit bigger than the cutout though. I can't remember whether a bit of jiggling and turning it diagonally can get it out the back. Unscrew the terminal housing and try.

[JimC]

Thanks Chaps, I'll have a look behind the Terminal Panel and report back.

Jim.

[system7]

You never know what you are going to find in a commercial design, which most times uses a simplistic crossover who's only real virtue is that it's small enough to fit on the speaker-plug connector.

But I wouldn't be surprised if it's like this Marshall Leach project, which uses the classic old well-behaved Vifa P17WJ-00-08 polycone. In fact people have done much more sophisticated things with that polycone.

https://leachlegacy.ece.gatech.edu/labsp2/

6" Paper cones usually need more work to get well-behaved, having some breakup issues at 5kHz or so.

http://www.troelsgravesen.dk/SEAS_CA18RLY-COMPACT.htm

http://www.ampslab.com/starling.htm

Nothing stopping you doing a bit of cutout measuring, and adapting one of those projects. Box-size is usually what you call a moveable feast.