They look fantastic. How are you setting up the Xover?
DIY Array, 2242 sub, 4408, 4208, Control 8SR, E120 Guitar cab, Control 1, LSR305.
Thanks Ed. 1250hz 12db/octave between the 123A-1 and the 2420/2307. And 8000hz between the former and the 2405. 24db on the 2420 and 12db on the 2405. I tried a bunch of different combinations. Most measured well but this one sounded most natural, I also like the wider dispersion of the 2405 so I'm crossing it slightly lower than the standard 9,5-10k. What made a big audible difference (but not so much in terms of measurements - probably since I don't have a high-end mic and anechoic chamber) was time aligning the drivers. I've never heard a big 43xx series, and while I've no doubt they sound good, a DSP controlled crossover can really make a difference here in my opinion.
Crossover update. 7500hz between 2420 and 2405 with a whopping 36db/octave gives the flattest on- and off-axis (both in the horizontal and vertical plane).
Changing the slope and/or moving the crossover to anything else seems to give not as good as a response. Perhaps some minor interference issues that are absent with this steep filter.
I will post some measurements soon enough.
Hi ivica
Yes, the units are time alligned with respect to the position of the voice coils, but also with respect to ear height relative to the units (between 2307 and 2405).
I also tried the 24db filter but there is still some interference between the 2420 and 2405 that way. I assume this there is little to be done about this since the wavelength for 7500hz is around 4,5cm, and the distance between the centre of both drivers is far greater than that. So there is bound to be some interference.
While I'm technically not knowledgeable enough to give a definite answer, I assume the sharp dropoff (combined with the phase shift of a 36dB filter?) gives a smooth response on and off axis nonetheless. The crossover is inaudible (both are actually!) so I'm not worried I should be implementing a different filter.. although there's no harm in experimenting of course.
Best
Tim
the combination kind of looks delicate with out lpads on the baffle.
did you consider a vintage electronic network, maybe a difference in sound, id like to know which you like better?
No, I just have the electronic crossover - not planning on doing passive.
Fooled around a bit further with time alligning, gain, .. dark arts..
While the individual response of the speakers hasn't altered much, there is now only one filter in place on both woofers to take out some excess energy, the combined sweep of both speakers has improved, and it's definitely audible.
Couple of peaks still (keep in mind the 2dB resolution of the graph) and I will try to take care of them next weekend, and do some A/B testing to see which I like better. Thing are sounding great as-is.
Just and FYI. You can upload a jpg right from your hard drive and it will be stored here. Good thing to do as some links/photo accounts go dead in time.
Cheers
DIY Array, 2242 sub, 4408, 4208, Control 8SR, E120 Guitar cab, Control 1, LSR305.
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