Crossover for BMS 4590 driver

[vinylnvalves]

Does anyone have any schematics for any proven "custom" crossovers for the BMS4590 ( 8 ohm ones) I have been unsucessfully attempting the flatten the response of these drivers by adding notch filters etc. ( running in a 200hz Le Cleach horn crossed actively @ 350hz)

I have looked on the web and have seen ones on german pages for eckhorns etc, and but i don't understand from my simple calcs what they are doing as the notch filters seem to be in places in the freq range where i don't think i need them.

 

[Brett]

Go active. I had a decent response dialled in in minutes with mine.

 

[vinylnvalves]

thanks for that advise, however i don't really want to go active with the MF to HF crossover as i haven't the room for another set of monoblocks!!

 

[Brett]

Have fun then. They have a mongrel of a Z curve from memory (I haven't used mine in years). Best bet is to measure them and sim an xover out with Passive Crossover Designer.

 

[ARIYAHOOR]

I know Alk Universal networks which are specially designed to use in Klipsch heritage horn speakers work great with BMS CDs. take a look may give you a clue:

 

[Brett]

^^ It would get you functional, ie make sound, but it's hardly a good combination. I had Khorns with ALKs when I first got them.

 

[vinylnvalves]

i had seen this and i throught it would be a starting point... KS-1804

 

[kimmosto]

i had seen this and i throught it would be a starting point... KS-1804

First X/O version of KS-1804 also included passive high-pass (C1011) for 4590/M. -6dB frequency was close to 410 Hz with SL250-2 horn:

An externally hosted image should be here but it was not working when we last tested it.

This could be one starting point but requires tuning for selected horn. I have also additional active filtering for resonance @ 3 kHz and peaks @ 7 kHz and 10 kHz.

Br,
KS

 

[vinylnvalves]

I have all the bits for this x-over, will build it and see how it compares to the std BMS x-over i already have. From my measurements todate there is a peak at 3kHz which is the most noticeable.
Will report back once i have the x-over up and running and measured.

 

[mdocod]

If you can take your measurements, and get them into simulation, you will be able to knock down response peaks in a matter of a few hours work in simulation.

 

[Brett]

I have all the bits for this x-over, will build it and see how it compares to the std BMS x-over i already have. From my measurements todate there is a peak at 3kHz which is the most noticeable.
Will report back once i have the x-over up and running and measured.

Why not simply knock that out at line level with a JFET based gyrator?

 

[vinylnvalves]

Got some time over weekend to build and test a crossover. Built it initially as per KS-1804, differences in horn etc results in a higher HF response than desirable. Reduced the attenuation on the MF which leveled things up a bit. Don't think this is the best way - maybe i need to add a shallow notch filter around 7.5k ?? I was going to use a series one - any reasons why not?

 

[vinylnvalves]

I meant to say a parallel notch filter - centred around 8k

 

[talaerts]

Klang & Ton published a rather elaborate filter for it, for their Tron design.
The crossover points are at 500 and 6500 hz.
Here you can see the list of components:
Tron
For the schematic you'll need to buy the magazine. The e-copy is not expensive:
https://www.hifitest.de/shop/magazine-epaper/klang--ton/klang--ton-2-2011-epaper.php

 

[vinylnvalves]

Thanks for the information. I already have the schematic for the Tron the Big Bang and a couple of others. Some of the elaborate filters i do not understand what the components are doing, so tweeking that to account for my horn will not be easy.

 

[amaco]

I just made ​​a crossover for BMS-4590. It works very well.

An externally hosted image should be here but it was not working when we last tested it.

 

[27ph]

I thread, but the image from amaco is no longer hosted. Any chance of a reupload for inspiration?

 

[Lowrideris]

anybody has custom crossover for 4590 or 4592nd 8 ohm ? or at least BMS original crosover schematics for 8 ohms? please help ! horn is 220hz tractrix wooden.

 

[Brett]

horn is 220hz tractrix wooden.

Do you already have the horn?

 

[Lowrideris]

MLH (germany made) horn is ordered, will have in 2-3 weeks., drivers ordered also, will have on hands in 3-4 days. but i want to start ordering some parts for pasive crossover. at least to start playing music and do some "safe" SPL measurments
oh, and bass is powered by hypex 251 DSP, 15" faithal 15pr400.