Honeybadger

This splitting hairs over and insignificant loss is silly. Any system with an Lpad has the same or greater losses than a swamped auto former. I don't see anyone here barking over the capacitive reactance of the 13uF cap in the AA vs: the 48uF in the super AA. (because it's silly) I have enough power to deal with insurmountable loss of a swamping resistor, I feel its benefits outweigh its deficits. If your system doesn't have the power to drive an 8 ohm speaker with an sensitivity of 104 db, you need a better amp. To me this is typical Klipsch clergy VS: vendors! HB

I have used the 15c several times, never had one contact motor board HB

I emailed ALK yesterday to verify exactly that. I was assured that Cornscalla wall crossover is available in different configurations. for instance the 400hz version uses a 47uf cap and the 600hz version uses a 33uf etc. I don't save and or repost emails to use against people, nor do I repost emails without express permission from the author. HB

You may be able to get away with that on a first order crossover, but it makes no sense. HB

I have used several crossover calculators, and I haven't found one yet that says one inductor fits all crossover points. You lost me on this one. HB

I don't know about that, I have had a lot of amps, some have 4 and 8 ohm taps, occasionally 6 or 2 ohm options, but haven't see one yet with a 6-70 ohm tap to deal with the heresy impedance. Although not absolutely necessary, a stable impedance network seems like a good idea to me. HB

Lets hope not. HB

Not a bad idea.

Dean, I think you are missing the point. I was referring to the Super AA exchange. My point is you can't change the additional parts to move the crossover frequency and stay at a price point of $99 Its like taking my bicycle in for a service, then ask them to change my gearing and not incur any additional costs. Sorry for the confusion. HB

Dylan's poetry is rough on the ears. Maybe with the exception of Hurricane. HB

It certainly won't hurt.

Those are amazing.+ HB

I thought the idea of the Super AA was to simply upgrade an already existing crossover. Moving the crossover points would require changing additional parts like the re-used inductor which would add additional expense. For the $$ the super AA is a bargain, I forgot this was an option until now. I still have a set of AA's from my Lascala's I was going to rebuild myself, but I don't think I can do as cheap. Thanks for the heads up Doug. Your network turned out better then mine! Don't use hot glue like I did... Messy HB

My mistake, its 400/600 an 4000/5000/or6000 I new there was a 5 in there somewhere. Found it on ALK page A true 3-way network including a full crossover from squawker to tweeter at 4000, 5000 or 6000 Hz (bandpass) allowing the use of any quality squawker driver or the Klipsch K55. The low frequency crossover is 1st order at roughly 400 or 600 Hz. The actual crossover frequency is acoustic and determined by the woofer and squawker driver and horn making it truly "Universal". It is compatible with the stock Cornwall, Heresy or virtually any Cornscala configuration.

When I ordered mine from Al, I was given different options for the Cornscala-wall crossover. I remember 400/600 might have been on option for 500 on the lf, and 4000/6000 on the top end. I have the 600/6000 in my Cornscala's

I missed that, I assumed the OP had Cornwalls. I didn't see mention of KHorns.

My guess is this is a 600/6000 network 33uf seems about right for an 8 ohm impedance at 600hz. If that is the question.

Here is the delta 12LFA, looks to be 95db to 200, then drops a few db.

Seems to me this bass horn should be very efficient. The Eminence 15c, which is very similar the k33 is roughly 96db to 400hz. When used in the Lascala the folded horn needs to gain 8db to achieved the reported 104db spl. The paralleled Delta 12LFA start at 98db, the mini punch horn only need to gain 6.0db to achieved similar performance. Below is the plot of the 15c Does anyone know if the folded horns generate higher gain than a straight horn?

This is from leonard audio http://education.lenardaudio.com/en/07_horns.html With no horn the cone movement increases 4 times for each octave decrease. With a horn the speaker cone movement is reduced to 2. Efficiency increase is approx 4 times (+6dB). In theory, power to the speaker can also be doubled (+3dB). Total advantage is approx +10dB with increased directivity. Designing for bass horns is always a compromise. The length of the horn is the most difficult to achieve if the bass horn has to be portable and fit within a given space. The compromise is to keep to the correct flare rate, and mouth size. Bass horns should be grouped to obtain the correct mouth size. JWC, What is the compression ratio. since you are using a 12 inch woofer, what is the horn opening. 6x6? I found the cutout on page 1, its 7X7 inches, the surface area of the driver is approximately 11 inches, the compression is nearly 2-1.

Exactly!

Will be here soon. I will do a slow build. Great project for my son and I. The woofers are approximately 94.6db, wired in parallel add +3d add horn gain = 99 -101db@ 1 watt. But how do they sound? HB

I am not sure if you agree the Tractrix sounds better than the exponential or not. If not- I have to agree to disagree. No amount of calculations is going to make me think the increased clarity I get from tractrix doesn't sound better than exponential horns. I assume this is exactly how you feel about CD horns. HB

To me the K-600 and Fastrack Cornwall horns sound very different. It doesn't sound like it is restricted to the lower frequencies only. HB

I am more concerned with the sound than all of this polar control jargon. All I am saying is the Tractrix sound better to me than the exponential. The horn above doesn't look at all like my old fastrack cornwall.