Corelli,
@kdude66
Kenny, I was interested in the reworking of your DI's. In particular how you changed your woofers from the alphas to the betas. On paper these are two different drivers. I could see how the betas with their larger magnets might offer slightly more efficiency and tighter bass, but at the expense of low end extension. The betas do have a slightly higher Fs as expected.
On a somewhat related note, how do these drivers achieve such low end extension when their resonant frequencies are in the low 50's?? They obviously extend well beyond that but I always read that Fs defines the low end extension and even in a reflex enclosure this seems way deeper than I would expect. Any thoughts?
You bring up some valid questions but for the most part they are none issues.Remember the 6 outer tweeters play down to their resonate freq. and isn't a problem,that's part of the magic of this speaker.
I wanted the black instead of blue cones and got lucky That I only changed the resistor value in the woofers crossover to deal with the slightly higher efficiency of the beta woofers and I ended up with in room measurements of bass measuring flat to 20hz and obviously tighter and better defined bass by listening that blends very well and is'nt overpowering to my ears.
I would have changed the cap and sand cast resistor in the crossovers to better parts anyway.
Remember those Thiele-Small Parameters specs are generally in the free air and once in a box everything changes in specs for the most part.
I've been modifying speakers and or electronics for a long time and I just didn't Willy nilly make these changes.I have been a Avionics Tech at a major Airline for 30 yrs.
I have accomplished other measurements as well and all I can say is the DI's have The flattest frequency response of any speaker that I have ever measured and the Impedance curve is truly remarkable as most of us owners are finding out in the respect of how easy a load for any amplifier that we might want to use.
As Tejay has stated several times the DI's are true conduits and will most definitely show any shortcomings in our systems but on the other hand they will give us also the true character of our gear also.
Kenny.
@kdude66
Kenny, I was interested in the reworking of your DI's. In particular how you changed your woofers from the alphas to the betas. On paper these are two different drivers. I could see how the betas with their larger magnets might offer slightly more efficiency and tighter bass, but at the expense of low end extension. The betas do have a slightly higher Fs as expected.
On a somewhat related note, how do these drivers achieve such low end extension when their resonant frequencies are in the low 50's?? They obviously extend well beyond that but I always read that Fs defines the low end extension and even in a reflex enclosure this seems way deeper than I would expect. Any thoughts?
You bring up some valid questions but for the most part they are none issues.Remember the 6 outer tweeters play down to their resonate freq. and isn't a problem,that's part of the magic of this speaker.
I wanted the black instead of blue cones and got lucky That I only changed the resistor value in the woofers crossover to deal with the slightly higher efficiency of the beta woofers and I ended up with in room measurements of bass measuring flat to 20hz and obviously tighter and better defined bass by listening that blends very well and is'nt overpowering to my ears.
I would have changed the cap and sand cast resistor in the crossovers to better parts anyway.
Remember those Thiele-Small Parameters specs are generally in the free air and once in a box everything changes in specs for the most part.
I've been modifying speakers and or electronics for a long time and I just didn't Willy nilly make these changes.I have been a Avionics Tech at a major Airline for 30 yrs.
I have accomplished other measurements as well and all I can say is the DI's have The flattest frequency response of any speaker that I have ever measured and the Impedance curve is truly remarkable as most of us owners are finding out in the respect of how easy a load for any amplifier that we might want to use.
As Tejay has stated several times the DI's are true conduits and will most definitely show any shortcomings in our systems but on the other hand they will give us also the true character of our gear also.
Kenny.
