L220 Frequence range

[Laketown]

Hi,

I have just bought a pair of L220 and I'm trying to find some information about these lovely speakers. Can you help me with some kind of diagram with the frequence range +-db?
Is it difficult to change them to Biamping??

Thank You
Mikael (Denmark)

[Zilch]

L220 Oracle is comprised of LE14A woofer with PR15C passive radiator, LE5-9 midrange with rare and fancy L94 lens, and prized 076 Elliptical tweeter.

Crossovers at 800 Hz and 5000 Hz.

N220 crossover topology looks easily separable on the shematic.

Alas, most of us have been locked out of the JBL Consumer tech database.

[There's still hope, tho....]

Brochure is in the Library here.

[Steve Gonzales]

Hi Laketown, I own three pairs of these speakers and have posted info on a great modification :http://www.audioheritage.org/vbullet...ead.php?t=3458
It is completely reversable and makes a DRAMATIC difference in the midrange quality. I have got so many truely great technical suggestions from fellow members that if you decide to do this mod, I/they have already laid the groundwork for it. JBL has always been careful and vague about specs at least for consumer models so not much info in the way of stated frequency response. You have something special there (IMHO) that will give you many moments of pleasure. I hope to see some pictures and posts about your bi-amp project. Good luck and Good Sound to you, Steve G.

[Mr. Widget]

Can you help me with some kind of diagram with the frequence range +-db?

I believe the official specs say: DC to Light... I am not sure what the tolerance is. Heck I am not even sure what units the tolerance would be in.

Sorry I couldn't help myself. I really doubt that there is a published specification for that speaker. Here are the typically vague but mostly true specs that are given.

http://www.lansingheritage.org/html/.../1979-l220.htm

Widget

[Don C]

And here's the tech sheet, in case you need it.

[Zilch]

And here's the tech sheet, in case you need it.

Steve will note the footnote under the schematic there.

OOPS! A different thread....

[Laketown]

Hi Steve. I have seen your pics and I would love to do the same to my speakers, but I think I'll wait some months so I can "learn" the sound from the original version before I can tell if a modification has improved the speakers.
Actualy I think they sound great now compared to my B&W 801 series 80 (modified)

Don thanks a lot for the tech sheet. I hope I'm wrong but it looks like the tweeter only goes up to 3000hz

My plan is to use a bridged "digital" power amp from LCAudio (+1000watt 8ohm) http://www.lcaudio.com/index.php?page=35 to control the 14" and a normal bridged Millennium XP power amp (+400watt 8ohm) also from LC for the mid and top. http://www.lcaudio.com/index.php?page=31
I' have an active X-over (http://www.lcaudio.com/index.php?page=13) that I currently use for my B&W's.

I'm not sure that the modifications done on my B&W's has changed the soundstage to the better. That's why I'm a little afraid to do modifications on the 220L's

Please give me you opinions/input/ideas !!!

Great forum
Thank you

[Don C]

Don thanks a lot for the tech sheet. I hope I'm wrong but it looks like the tweeter only goes up to 3000hz

I am certain that the frequency response of the tweeter is much better than that. I think that they have provided those numbers because they want you to sweep over those frequencies while tightening the screws when you replace the diaphram.

[4313B]

Hi,

I have just bought a pair of L220 and I'm trying to find some information about these lovely speakers. Can you help me with some kind of diagram with the frequence range +-db?
Is it difficult to change them to Biamping??

Thank You
Mikael (Denmark)

It had a frequency range of ~ 32 Hz to ~ 20 kHz ( -6 dB downpoints )

Usually the 3-way systems with the LE5 midrange transducers aren't worth the trouble of bi-amping.

My plan is to use a bridged "digital" power amp from LCAudio (+1000watt 8ohm) http://www.lcaudio.com/index.php?page=35 to control the 14" and a normal bridged Millennium XP power amp (+400watt 8ohm) also from LC for the mid and top. http://www.lcaudio.com/index.php?page=31
I' have an active X-over (http://www.lcaudio.com/index.php?page=13) that I currently use for my B&W's.

Perhaps if you built new enclosures and replaced the LE5 with an HL93/375 or 376...

Can you imagine an L300 with a LE5-9 mid???

I don't have to imagine too hard. LE5/2105's with 136/2231's and 077/2405's. Basically 15" versions of the L65 or S21. Did LE14 versions too. They actually worked surprisingly well but the LE5/2105 only had roughly 1 dB of headroom left over keeping up with the 136/2231. The HL93/2308/2311/375/2440/376/2441 was "killer" for dynamic range, impact and better "time alignment". Did them too with twelves, fourteens, and fifteens. The 076/2403 was quite nice, it could go down to meet the LE5/2105 or the big four inch compression drivers at a more sensible frequency than the 077/2405 could.

[Steve Gonzales]

That is some VERY interesting information Giskard, What do you presently use for speakers?

[Mr. Widget]

If I remember correctly he said it was a speaker from Bose.

Widget

[4313B]

Yeah, Bose.

I deleted the post because I didn't want to have to get into some big huge explanation about why Bose spanks hell out of JBL.