up and down, side by
1 B & C DE250 on flag ME45 cut 1k96h Linkwitz riley 12bd/oct
2 Beyma 15MI100 low cutoff between 110h and 130h 24dB/oct Butterworth, Linkwitz Riley high 1k96 12bd/oct
2 Beyma 18G50 high cutoff between 110h and 130h butterworth 24dB/oct
filter behringer DCX9624
amp Mac mah VZX pro 3.2 for two 18G50 (hp saturate the amplifier before the clip, so be careful to limit)
use? to make people dance! and they dance ^ ^
110hert/130hert why? depending on configuration. as indicated above, we must make compromises. 15MI100 suffer greatly at the low frequencies, 18G50 130h to work very well, so outside the transition frequency is low at 130 hours, with a slight correction in this band for not putting forward. Indoors when the power demand is not high, I cut as much as possible for as low as possible.
during my various tests in a single box of 110 liters, I tested my four hp one by one, well what a surprise to "see" that the record was very different from an HP to another!
out of curiosity I measured with the oscilloscope the fs open air two hp on the fs was 30h and the other well above. I do not remember exactly but it stood to 37hertz. I made this measurement using several methods, history of avoidance of doubt! hertz to a close the result was the same!
I found that manufacturing tolerances are much wider in Beyma. also make compromises.
being passionate lovers cheat, buy a system "branch and sends the purée" will afford no satisfaction. so I built the boxes alone, without help, but my friend carpenter.
first say, who began to have a record not too bad was a bass reflex area of 390 liters (2 * 18g50 per case). then yes, it's down low, very low! but it did not much power, it was quickly brrr brrr brrr, brouu brouu brouu, Braa Braa braaaa. and it was drooling, but then it was drooling!
Hop over again.
second box bassreflex: 310 liters for two 18g50 always. it is already there in another world! then yes it does not drop too low, but power handling is much better to see very good, it dribbles very little, very little.
bassreflex third case: a 110litres 18g50. is striking, but then it's really powerful, phew, too powerful, unnecessarily powerful, yeap! by down squarely against it does more. power handling is excellent for cons, really excellent.
two 18g50 adopted in 310 liters is a good compromise. Each face (the front and the event of course) is cushioned by the foam MDM-40. do not ask me the resonant frequency of the event (laminar single center) I know nothing, I relied in my ear: I share an apartment that I know too much, and I Farm As up to get the best possible service.
thank you Bassbox pro eminence in passing.
and well in this case of 310 liters (useful course), granted I do not know how often I get the result I was looking for: a good compromise.
it goes down fairly low without sacrificing accuracy, it goes relatively high for a small spectral correction, it is striking without being soft or knock out the power handling is still very good, 750Watt RMS are advertised here.
I now have the hp in my possession since close to two years. I broke a membrane (offset) because of my first attempts, in a DIY fund bandpass of 450 liters. bin it works not at all ^ ^ That said I doubt that HP may be seen as cheap cashed would have all that the poor received my first 18G50.
Since the fund of 390 liters, and then adding two more hp (after the shift to 310 liters) more hp does not budge. and yet the funds are abused, with no storage place, they sleep in my van which I use often in my travels! hp these are very solid, no doubt about it.
I'm not sure the days when I want to upgrade my system, I do change by doubling the quantity. I would like to extend the bandwidth, but this time without compromise. and there I'm looking in all directions, I can see that the principle of the system four votes assets capable of meeting my requirements. certainly going to have to give up my 18G50, who can not work properly at very low frequency.