Network for JBL L45 Flairs eWaved with 2235 Woofers and QSC Waveguides?

[Zonker92]

Thanks to Bart, I now have a pair of empty L45 Flair cabinets (exemplar photo below)--maybe 5 cubic feet inside--and I'm planning to make them into eWaves for a buddy of mine. I think I might use 2235H woofers with QSC 152i waveguides with D220Ti drivers up top, crossed over around 1,000 Hz, but I'm pretty clueless about crossovers.

I was thinking perhaps I should used the eWave SR HF circuit (see http://techtalk.parts-express.com/s...-Your-PCD-Mettle/page25&p=1658207#post1658207), and the 4430's LF circuit (see http://www.jblproservice.com/pdf/studio monitor series/4430lr.pdf), which crosses over at 1,000 Hz.

Thoughts? Thanks!

HF circuit here:

LF circuit here:

HF curve here:

 

[Zonker92]

Bump to say I've filled my basket at Parts Express.

 

[stoN_Cold]

Full basket, nice.

 

[Zonker92]

Actually, when you "replied," I was working to post the parts list for the reference of anyone who cares.

OK, so here:

Selenium ADF25-25 Horn Adapter 264-322 2 $2.79 $5.58
Dayton Audio DMPC-18 18uF 250V Polypropylene Capacitor 027-434 2 $6.52 $13.04
Dayton Audio DMPC-12 12uF 250V Polypropylene Capacitor 027-430 2 $5.24 $10.48
Dayton Audio DNR-6.0 6 Ohm 10W Precision Audio Grade Resistor 004-6 2 $1.38 $2.76
Dayton Audio DNR-7.5 7.5 Ohm 10W Precision Audio Grade Resistor 004-7.5 2 $1.38 $2.76
Dayton Audio BPA-38SN HD Binding Post Pair Satin Nickel 091-1247 2 $8.48 $16.96
Precision Port 4" Flared Speaker Cabinet Port Tube Kit 268-352 2 $14.35 $28.70
Dayton Audio DNR-12.5 12.5 Ohm 10W Precision Audio Grade Resistor 004-12.5 2 $1.38 $2.76
Dayton Audio DMPC-2.0 2.0uF 250V Polypropylene Capacitor 027-414 2 $1.61 $3.22
Dayton Audio DMPC-4.0 4.0uF 250V Polypropylene Capacitor 027-421 2 $2.19 $4.38
QSC PL-000446GP Replacement Waveguide Horn for HPR152i 2-Bolt 245-625 2 $35.00 $70.00
Dayton Audio DNR-30 30 Ohm 10W Precision Audio Grade Resistor 004-30 2 $1.38 $2.76
Dayton Audio DMPC-10 10uF 250V Polypropylene Capacitor 027-428 2 $4.72 $9.44
Parts Express #6 x 3/4" Deep Thread Pan Head Screws Black 100 Pcs. 081-435 1 $2.90 $2.90
ERSE Super Q 2.7mH 16 AWG 500W Inductor Crossover Coil 266-910 2 $20.81 $41.62
Jantzen Audio 1.2mH 20 AWG Air Core Inductor Crossover Coil 255-050 2 $8.50 $17.00
Jantzen Audio 0.30mH 18 AWG Air Core Inductor Crossover Coil 255-218 2 $6.70 $13.40
Selenium D220Ti 1" Titanium Horn Driver 8 Ohm 1-3/8"-18 264-270 2 $49.99 $99.98
ERSE 1.5mH 18 AWG I Core Inductor Crossover Coil 266-552 2 $7.98 $15.96
Parts Express Speaker L-Pad Attenuator 50W Mono 1" Shaft 8 Ohm 260-255 2 $10.90 $21.80
Sonic Barrier 1/2" Acoustic Sound Damping Foam with PSA 18" x 24" 260-520 1 $9.97 $9.97
125uF 100V Electrolytic Non-Polarized Crossover Capacitor 027-362 2 $2.15 $4.30

 

[GordonW]

That might work. I'd be prepared to play around with the coil and cap value on the woofer, though. I don't really have a good idea on how well that would match up from a FR standpoint, or how well it would phase-align with the HF section. That could be dealt with by tweaking the low pass, naturally...

The other option would be the Z19 crossover.IIRC, it's about 1200 Hz. I'd bet THAT could be made to work...

Regards,
Gordon.

 

[Zonker92]

Thanks, Gordon. With I had a clue on such tweakage, but with luck it would be pretty close to start with.

I made some Z19s once, but as I recall they were not designed for a CD horn. Would that make a difference?

 

[stoN_Cold]

I'd knocked attenuators R201& R202.

 

[jblmar]

Thanks to Bart, I now have a pair of empty L45 Flair cabinets (exemplar photo below)--maybe 5 cubic feet inside--and I'm planning to make them into eWaves for a buddy of mine. I think I might use 2235H woofers with QSC 152i waveguides with D220Ti drivers up top, crossed over around 1,000 Hz, but I'm pretty clueless about crossovers.

I was thinking perhaps I should used the eWave SR HF circuit (see http://techtalk.parts-express.com/s...-Your-PCD-Mettle/page25&p=1658207#post1658207), and the 4430's LF circuit (see http://www.jblproservice.com/pdf/studio monitor series/4430lr.pdf), which crosses over at 1,000 Hz.

Thoughts? Thanks!

HF circuit here:

LF circuit here:

HF curve here:

 

[jblmar]

Bart,
Nice looking pair of JBL speakers.
The 2235H is recommended to be crossed over at their highest point of 1KHz. I cross mine @ 800 Hz to the 2425J/2370 horn. The 3110A is a great network.
Just my $.02.

 

[Bkphoto]

test the coils, i got some that were way out of spec from ERSE...

 

[Zonker92]

Will do; thanks.

Alright, screw it; I ordered up all those parts. I'll report back in when it's in the works or done.

 

[Ed Zeppeli]

I kind of agree with JBLMAR. How low will your horn/driver combo go? Would it be able to handle a lower crossover frequency?

Cool little project btw.

 

[Zonker92]

Thanks! Here are the crossovers thus far. Still waiting on a few parts. Cabinets are almost done, too.

 

[RS Steve]

Nice project Zonk, I had a pair of L45's a few years ago that were just the two ways, ended parting them out since nobody wanted them. Can't wait to see your end results.

 

[Zonker92]

Thanks, Steve! I'm really winging it here, with this crossover design. I wonder if I should keep the HF polarity reversed per the schematic? I guess I'll try it both ways.

 

[RS Steve]

That's part of the fun I guess, you can pretty much try what you like, and adjust from there.

 

[Speedbump71]

Zombie thread back from the dead. Did these ever get finished? Got any pics, and observations on results? I have a set of cabinets that I'm staring at with bad intent....

 

[Zonker92]

Yes! http://audiokarma.org/forums/index.php?threads/jbl-l45-flare-ewaves.702194/

 

[Speedbump71]

Very Nice! I'm leaning towards staying with a three way design, but that certainly gives me something to think about!