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Re: Hoo Haa!

Posted by PK (A) on July 12, 2006 at 03:25:48

In Reply to: Hoo Haa! posted by RCA-fan on July 11, 2006 at 15:23:28:

Hi Bill,

Thanks a lot for your kind words and your friendly offer!

First of all, I must admit that the bass horns were built by a professional carpenter - not by me. I made the simulations and the drawings, but only after a lot of help from a lot of people on this forum and elsewhere (especially thanks to John Sheerin, Bill Fitzmaurize, Jeff Robinson and Bert Doppenberg!).

Regarding the crossover, I would really appreciate if you would take a look at it!

Below, I have provided some additional info that will be helpful. Please let me know if you need more:

- The mid/high Bentwood 200 horns have an exponential flare with an Fc=200 Hz.

- My BMS 4592 ND drivers are the 16 Ohm version.

- From BMS I have got the following additional values: mid-section: Le=0.19mH, Re=8.9 Ohm; High-section: Re=7.0 Ohm

- I started out with the standard BMS crossover, but changed to the version I use know which is clearly better. In order to compensate for the dip around 6k, I have inserted a “by-passing” cap over the series resistor in the L-pad. This gave all the presense back! I do not know how to post a schematic here, but if you give me your email, I can send you a detailed schematic of the crossover as an attached file (the crossover is quite different from the standard BMS and uses an impedance correction made by Bert Doppenberg on the mid section, so I would think that you would need it)

I have an impedance plot of a 8 Ohm version of the BMS 4590 (cheramic version) mid section on the Bentwood 200 horns I use. I can send you this as well if it is of any help.

Please note, between the bass horns and the BMS drivers I use an ACTIVE crossover (12 dB/octave at 266 Hz).

Thanks a lot again!

All the best
Peter

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