My high efficiency system that I am perfecting is based on an Altec 414 Z in about 50 litres volume , freq. range 50 hz - 700 hz + JBL 2420 in biradial fibre Horn RCF - 700 hz - 6000 hz , as tweeter Ev. T35 , but the latter was only lent to me by a friend , to replace it validly , given the unavailability of the T350 model at decent prices for its age .
A good friend who is very knowledgeable on the subject , seeing that my drivers are in alnico and therefore the sound is in any case quite different from other materials , has advised me using a tactrix wooden horn of about 135 mm. in output width and 60 mm. deep , obviously with throat . or the Radian 475 PB with an aluminium diaphragm or the BMS 4540 with a synthetic ring diaphragm and a one-inch throat, what I am a bit afraid of is the sound signature in a vintage box, bearing in mind that the amplification is quite vintage and the crossover would be set up by me using Clio, which I know how to use quite well.
Regards
Roberto
A good friend who is very knowledgeable on the subject , seeing that my drivers are in alnico and therefore the sound is in any case quite different from other materials , has advised me using a tactrix wooden horn of about 135 mm. in output width and 60 mm. deep , obviously with throat . or the Radian 475 PB with an aluminium diaphragm or the BMS 4540 with a synthetic ring diaphragm and a one-inch throat, what I am a bit afraid of is the sound signature in a vintage box, bearing in mind that the amplification is quite vintage and the crossover would be set up by me using Clio, which I know how to use quite well.
Regards
Roberto
FWIW, historically we had to shelve the mid horn quite a bit to the point where a bypass cap could be used to 'lift up'/'flatten out' the 'drooping' HF, i.e. RLC network (AKA CD horn EQ).
Otherwise best AFAIK to get some more JBL2420 or Altec 802 or GPA's 802-8G (Alum/AlNiCo) and either make a diffuse baffle horn 'extension' using whatever damping material sounds best to you or add a round over to a 3/4" - 1" very dense material baffle sized to 'taste' to get the desired polar response match-up.
Otherwise best AFAIK to get some more JBL2420 or Altec 802 or GPA's 802-8G (Alum/AlNiCo) and either make a diffuse baffle horn 'extension' using whatever damping material sounds best to you or add a round over to a 3/4" - 1" very dense material baffle sized to 'taste' to get the desired polar response match-up.
Hi
Well what you say is partially what I am already doing , switching from two-way to three-way , making the midrange do a correct band , using another 2420 or 802 , with the new specific horn I had made , could still be a solution , but surely it would be cheaper to run a new latest generation compression drivers , especially if annular , the problem is just knowing which................the two I indicated are the result of advice not my own tests , so I am open to the experience of those who have already tested this solution .
Regards
Roberto
Well what you say is partially what I am already doing , switching from two-way to three-way , making the midrange do a correct band , using another 2420 or 802 , with the new specific horn I had made , could still be a solution , but surely it would be cheaper to run a new latest generation compression drivers , especially if annular , the problem is just knowing which................the two I indicated are the result of advice not my own tests , so I am open to the experience of those who have already tested this solution .
Regards
Roberto