[curious about DHA2 crossovers]

thanks for the help tigerwoodKhorns and JohnA.

my first setup is same DHA2 bi amp.

when i change to one amplifier, i here the brightness, so i thought its the bass power.

according to the mic measurement, the mid k55v is fall at ~5k, so change to 2uf is not good.

i try the L-pad

[curious about DHA2 crossovers]

thanks Marvel

today i try only SET amp, feel to me little bright, maybe its because i dont have autotransformer?

how much 'db' down do you recommend?

in bi-amp, i just balance with MIC.

 

[curious about DHA2 crossovers]

you're right.

k33 is 4 ohm and k55 is 16.

 

have SET amplifier.

need to decide between bi-amp with crown amp to the BASS 🤔

now i with mini DSP, and move to DHA2 crossover.

thanks

[curious about DHA2 crossovers]

build prototype of the DHA2. like @Marvel version.

I'm wondering if this is dangerous for the k55v mid?

the cutoff frequency is ~450hz and 6db/dec  😱

In any case, the sound is deep and with big soundstage 

[JBL2226 VS black widow1504 folded horn FH-1]

thanks

i continue with the JBL

[JBL2226 VS black widow1504 folded horn FH-1]

measure with white noise, put the horn in the same corner, 1m distance. 500hz cut.
i think the jbl is more high level and more flat.

[JBL2226 VS black widow1504 folded horn FH-1]

i don't know about the results, but the  black widow is more boomy and punchy.

here is the jbl vs BW in the same chart.

the jbl is more high in the low mid (~200hz)

the BW in more punchy (<100hz)

measure at 1.2 meter normal level

 

[JBL2226 VS black widow1504 folded horn FH-1]

ok' the wall is moving 😀

 

 

 

[JBL2226 VS black widow1504 folded horn FH-1]

OK

calibrate the mic and measure with high level (i have crown amplifier for the bass)

with no music its 35 dB(z)

 

 

 

 

 

[JBL2226 VS black widow1504 folded horn FH-1]

again, thanks. in high level, the jbl become more flat from 55-300hz, and the black widow the opposite.

Attached distortion measurements 

[JBL2226 VS black widow1504 folded horn FH-1]

thanks Chris

take the measurements  from 40cm and low level.

 

Attached measurements at a distance of 1 meter high level. It can certainly be seen that the black widow has changed.

 

 

 

ZOOM

 

[JBL2226 VS black widow1504 folded horn FH-1]

i think i know how to here distortion in high frequency, but how to do it in low frequency?

add the distortion measurements.

 

[JBL2226 VS black widow1504 folded horn FH-1]

hi
I have been looking for a folded horn for a long time, I almost built one, many thanks for @garyeanderson.and then I found the peavey fh-1. buy it for 400$. with new black widow 1504.
I understood from reading in the forum that the jbl2226 speaker is very high quality for folded horn, so i buy one, in addition to other forums they preferred it over the peavey black widow 1504.

What do you think about the results?

the black widow 1504 is little more punchy

[Measurements k55v,JBL2447,K400,H1230,LOMO KINAP]

Recently I am interested in building SACLA speaker, I purchased and built some horn and speakers, below are the results:

K55v+YAMAHA H1230 horn

K55v+K400 DIY horn

K55v+LOMO KINAP horn

JBL 2447 +YAMAHA H1230 horn

 

with the JBL you almost don't need tweeter, but the titanium are noticeable.

the k55v little more flat to 3khz, the JBL more round curve

don't know what to decide. k55v or JBL2447. try the k55v with k77.

change the level for visualize.

 

[Scala bass bin with curved sides]

Hi,

I'm trying to build the FH-1, does anything have a drawing?

thanks

[ES600 and ES700 - got them..thanks]

!

[D.I.Y. ES400 Crossovers for KHorns - Sold]

If you have the schematics , I would be happy to get it

[La Scala extreme-slope crossover]

hi,

start to build the La Scala speaker and wonder what crossover i need.

i read about the classic AL-3

and about extreme-slope crossover 400hz

cant find the schematic for the ALK ES400

I would appreciate recommendations for a first step

k400 horn, k55v

k77

jbl2226 

[horn for k55-v]

its jbl 2447 > adapter 1.5" to 1" > k400

of course the build its only for testing.

[K400 dimensions?]

thanks WMcD

follow the link, and build test k400 from cardboard.

the length is 48.5cm, i hope its not small.

REW with 2447 jbl. the k55v is on its way.

[horn for k55-v]

build the k400 horn, its down to 300 with no problem.

[2" 223Hz tractrix horns]

thank

build the k400 horn, its down to 300 with no problem.

thanks

[K400 dimensions?]

try to insert the dimension for k400 in the TRACHORN.EXE software:

the fc is not close to 300hz 🤷‍♂️

[K400 dimensions?]

On 9/29/2002 at 1:05 AM, WMcD said:

It is not extremely difficult to build something similar to a K-400 out of wood. But it ain't easy, either. A photo of my first effort is attached.

My goal was to build a K-Horn without factory parts. So buying a real K-400 was not in my mind. (The bass horn was per the SpeakerLab plans.) Seems nutso, but such was my determination.

I'd be happy to correspond with anyone who wants to build the midrange.

The starting point was PWK's article about the K-400. That gave mouth dimensions and flare rate. That allows a calculation of area at any point.

Also, Dr. Bruce Edgar, in SpeakerBuilder, had described the technique of using flat pieces of plywood for the top and bottom surfaces for his tractrix midrange. He used a jig to hold the top and bottom pieces and constructed the sides with short lenghts of wood pieces, then filled them with puddy and sanded them. I call this the popcicle stick technique. I used that on another project.

Let me point out that the top, bottom, and sides of the K-400 follow an exponential curve, I think. Yet with Bruce's design, and mine, the top and bottom are linear. So the positions of the side walls have to be recaluculated to maintain an exponential area, in my case, or a tratrix, for his.

An issue in construction was whether I wanted to use Bruce's popcicle technique. Here, I used several layers of 1/8 inch plywood with yellow glue between the pieces. While the top and bottom pieces were on the jig, I pulled them into place with drywall screws (with washers) into the top and bottom pieces. You can see the puddy on the edges, covering the marks. There was a lot of triming necessary.

A more difficult woodworking issue arose from the fact that the driver I used had a 7/8 inch diameter. The Klipsch drivers are similar. That is an EV-1828 in the picture. Dr. Bruce didn't have to deal with it.

My solution was to use plywood down to an area of 1 square inch from the mouth. Then something different to mate to the driver. (Note, this is similar to the K-5 were PWK uses a cast metal mating device.) I made up donuts from plywood with hole saws and rasped out a flare. The ply donuts were difficult to work with. The driver thread, itself, was used as a tap to mate it.

This matching section was a bear and I didn't like the kludgy nature. In the second effort, I used three pieces of glued up 1 x 3 poplar to form a block, bored it with a 7/8 inch spade drill and rasped to mate with the 1 x 1 thoat of the plywood bell.

Also, Parts Express had a plastic device to mate the compression driver to a 1.4 inch diameter bolt on throat. So I adapated that to give a better screw on mount. (Sorry, no pictures just now.)

The assembly showed in the photos tested well. I can't say that it was worth the effort over buying a real K-400 or K-401. However, if you have the disease of, "I want to do it myself", it can be done.

Gil

 

hi,

just buy k55v and love to build k400 for them. do you have the k400 plans?

thanks

[horn for k55-v]

Last week I heard the la Scala horn, this is what caught me! The sound of the guitar coming out of the horn, I want one.

I just bought a k55v for 250$. And I was thinking what horn can I build for him?

i see k400 plans here.

and read about Bruce Edgar Tractrix horn

 

Am I in the right direction?

thnaks