Long awaited 1501Fe - Edgarhorn project

[spkrman57]

Pre-amp – Counterpoint Solid 8A
Amp – Soundcraftman PM-860 Mosfet 200 wpc @ 8 ohms

Tuner Denon TU-450
CD player – AudioNote AN-CD2.1x tube buffered output

Crossover – passive 2nd order LF @ 1100Hz(Bessel) – 3rd order HF @ 1800Hz w/att-EQ passive

LF driver – JBL 1501Fe 15” 93 db/watt installed in 3 cu ft cabinet port tuned to approx 35Hz

HF driver – JBL 2445J/Be on 350Hz round tractix horn

Future design will be bi-amped to facillitate tube amp on the horns!

Currently I have to say the crossover is not best for this 2-way, but sounds very promising with some tweaking, especially attenuating the horns (113db/w) to the woofer (93db/w).

The bass goes deep and very articulate! I could only imagine when I can afford custom cabs at the proper size and tuning

Ron sends...

[spkrman57]

Playing pipe organ music and impressed with the minimal excursion of the 1501 while filling the room with plenty of LF energy!

The 2226 was my favorite driver until now!

I can't wait for the 1501's to reach full break-in!

Pics of 2226 - 1501 for comparison

Ron sends...

[Mostlydiy]

Looks promising. Wouldnt ~800Hz be a better cutoff for that kind of system?

/Mostly

[NickH]

I see you have quick access to your beer stock pile while listening.

Very cool setup.

[JuniorJBL]

Those are some mighty big woofers you got there!!



Congrats 57!!

[spkrman57]

Looks promising. Wouldnt ~800Hz be a better cutoff for that kind of system?

/Mostly

I'm waiting for my dbx driverack to come back home from on loan to a friend.

I just wanted to start the breadboard up for trying different ways of incorporating the 1501 and HF horn system.

The crossover was used for a different system and it allows me to listen to the 1501 and determine how I want it run in the future. Yes, I know it's not optimum but I can listen to it until I get what I need in the future.

When my financial means improve I will have cabs built for the 1501's.

Regards, Ron

[spkrman57]

Those are some mighty big woofers you got there!!



Congrats 57!!

I always liked the 2226's for their excellent midbass qualities.

The 1501 goes lower and still has some of the qualities of the 2226 that I like.

I still might use the 1501's for subs and run either E-145/2206/2226 for mid/midbass. This will be a work in progress for me.

This driver should have been available back in the day, it would have killed the competition big-time!

Thanks to all the folks who made my 1501Fe's possible!!! It's a shame this driver will quietly dissappear, but hard to argue Nd is not the way to go.

Regards, Ron

[spkrman57]

I see you have quick access to your beer stock pile while listening.

Very cool setup.

I do part time Bar-back work and the empty beer cases are good for storing a lot of things. And when they get old or fall apart I just recycle them.

Thanks for your kind thanks.

I can't wait until I can go digital x-over and use tubes on the HF.

Ron

[Mostlydiy]

I'm waiting for my dbx driverack to come back home from on loan to a friend.

I just wanted to start the breadboard up for trying different ways of incorporating the 1501 and HF horn system.

The crossover was used for a different system and it allows me to listen to the 1501 and determine how I want it run in the future. Yes, I know it's not optimum but I can listen to it until I get what I need in the future.

When my financial means improve I will have cabs built for the 1501's.

Regards, Ron

I get it, sounds reasonable.

Btw, I like your horns, the upper horns in my avatar is 320Hz tractrix also. They do a decent job down to about 500Hz with the right driver. Currently I use B&C DE75 because one of my 2441 needs a new diaphram The DE75 does a great job as substitutes I have to say.

/Mostly

[spkrman57]

Btw, I like your horns, the upper horns in my avatar is 320Hz tractrix also. They do a decent job down to about 500Hz with the right driver. Currently I use B&C DE75 because one of my 2441 needs a new diaphram The DE75 does a great job as substitutes I have to say.

/Mostly

You should try some Be phrams and hear how smooth they are.

I'm still struggling with the sheet BrushWellman included with my Be phrams that state recommended x-over of 1Khz @ 12db/oct. I'm thinking I want 750Hz and wondering if they are just covering their arse with the higher than usual recommendation.

Regards, Ron

[grumpy]

You can trade off lowering crossover freq with using steeper slope crossovers and/or lower power limits.
Keep in mind that 1/2 the freq is double the excursion, and there's not a lot of play in the dia to phase plug distance, which limits how far you can make such a trade off. Ask the Be folks if 750Hz @18 or 24dB/oct would still be ok... I'd guess, yes... especially for home use.

[cooky1257]

I have the 4008 Be phrams they recommend 500hz @24dB/oct minimum.

[pos]

Keep in mind that 1/2 the freq is double the excursion

Actually its 4 times the excursion for a given SPL, but the backcap will act as an acoustical HP filter with a 12dB/oct slope, keeping excursion constant.

I don't think there would be any problem with a 24dB/oct acoustic filter at 750Hz for home use. This will probably require something like a 12dB/oct electrical filter around that frequency (and some EQ).

The S9800 electric filter for example is a simple cap (6dB/oct), and results when added toghether with the natural rolloff of the horn and compression driver to something like a 24dB/oct LR filter. This is probably too low an electrical slope (and this was corrected in the S9900 I think) but at least it seems that no compression driver was hurt during the life of that speaker...

[grumpy]

Actually its 4 times the excursion for a given SPL....

thanks... That's what I thought I remembered, then re-read (or mis-read) a JBL tech note and figured I'd remembered wrong (doh).

http://www.jblpro.com/BackOffice/Pro...s/tn_v1n08.pdf

[spkrman57]

I will be using either a 8 or 9 wpc single ended tube for the horn, so I think 750Hz @ either 18db/oct or 24 db/oct should work well.

I also have a small room so I don't see much cranking levels anyways.

The 4365 spkr system uses a passive crossover @ 750Hz 3rd order LF and what looks to me like a 2 nd order HF. But that is Mg phrams and wonder if they are run close to their limits in that application?

Regards, Ron