Long awaited 1501Fe - Edgarhorn project

[doucanoe]

Looking good over there, Ron! New toy's are always fun and it looks like you have some nice ones to play with. Good to see you getting back in the game again.

RC

[grumpy]

The 4365 spkr system uses a passive crossover @ 750Hz 3rd order LF and what looks to me like a 2 nd order HF.

As pos was pointing out, JBL has been combining the acoustic, low-end rolloff characteristics with the passive component electrical filter
to reach their crossover goals (such that a 2nd order HPF combined with some EQ and the horn/driver response may provide
a much steeper than 12dB/oct type overall response ... e.g., 24dB/oct). It would be fun to hear that system!

[cooky1257]

FWIW( unless they've change since I got mine.)

[grumpy]

For those that can't read the section of topic (I just barely could)... it's "...minimum recommended crossover at 500Hz with a 24dB per octave slope..."

[spkrman57]

My literature came with a 2012 Copyright date.

"Minium recommended crossover frequency is 1 Khz with a highpass slope of 12 db per octave or greater" is what I rechecked and read in my brochure.

Maybe they don't want to take chances...?

I may send them a e-mail and get their opinion.

Ron

added: I see your brochure looks like a 2009 copyright (bottom of last page!)

[spkrman57]

I think BW is just being cautious.

I'm running tubes when I get to bi-amp.

Ron

[grumpy]

Using Butterworth 12 and 18db/oct, L-R for 24dB/oct

(rough numbers)

1KHz/12 750Hz/18 500Hz/24

1000Hz -3dB -1dB 0dB

750Hz -6dB -3dB -1dB
500Hz -12dB -11dB -6dB
250Hz -24dB -28dB -24dB

so the later spec does give them a bit more protection
in the ~400-600Hz range

In the plot below (Rane), you'd need to slide the
responses up and down the frequency axis to make the
same comparison.

[cooky1257]

My literature came with a 2012 Copyright date.

"Minium recommended crossover frequency is 1 Khz with a highpass slope of 12 db per octave or greater" is what I rechecked and read in my brochure.

Maybe they don't want to take chances...?

I may send them a e-mail and get their opinion.

Ron

added: I see your brochure looks like a 2009 copyright (bottom of last page!)

Yeah 2009, I wonder if they've been getting failures and have amended as a precaution?

[spkrman57]

It looks like 18 db/oct @ 750 Hz looks good to me as far as being safe.

Ron sends...

[spkrman57]

I'm getting my dbx driverack pa + back Monday morning.

I'm thinking 1501 up to where midbass/midrange driver takes over.

Options for mid: E-145/2206/2226/Ev Sp-12 (I'm thinking 2206 best here) powered by single ended tube amp. either KT-88 or EL34.

HF is already good: JBL 2445/Be/350Hz Edgarhorn powered by 300B SET amp (my favorite amp!)

With either the JBL 2206 or EV SP-12 1Khz on the HF is no prob, in fact I would be comfortable @ 1200 Hz with those drivers.

I welcome comments here on this.

This will be a work in progress and I don't mind trying different drivers for the mid until I get the sound stage I'm looking for.

Regards, Ron

[Mostlydiy]

That means you are going three way I presume? Dont neglect 2202 and 2123 into your considerations...

/Mostly

[spkrman57]

That means you are going three way I presume? Dont neglect 2202 and 2123 into your considerations...

/Mostly

Except the ones I mentioned, I actually already have and I'm too poor to be buying anything else for the moment.

Regards, Ron

[spkrman57]

I think they are great drivers with that 4" voice coil and same magnet as 2226 should be a great mid driver.

Opinions wanted!

Also if anyone knows what to use as distance behind the 1501Fe the voice coil is. There is 2 windings and not sure what to use.

Regards, Ron

[badman]

I think they are great drivers with that 4" voice coil and same magnet as 2226 should be a great mid driver.

Opinions wanted!

Also if anyone knows what to use as distance behind the 1501Fe the voice coil is. There is 2 windings and not sure what to use.

Regards, Ron

I designed a system around 2206h and am very pleased- it can be run unfiltered, at home levels, without the breakup being too problematic.

[4313B]

Why would you want to put anything between the 1501FE and the horn? I must be missing something. ( Don't throw that horseshit about not using a fifteen up to a thousand cycles in my face )

I decided to use my 2206H's with some brand spanking new 2105H's and 052Ti's JBL hooked me up with a couple months ago. That's only because I can't afford another pair of 476Mg's.