Beyma 18G50

Between 18sound; eminence or rcf (too expensive) I pulled over Beyma 18g50.
Now there 18g50 and others I have not had to test it as I was seduced by the care of his joining the seriousness of his double spider and the assurance that it releases the ds first sight.
it's pro and he cried aloud once well log.

SOUNDS

Was not equipped to check the curve of the frequency I trusted to the Beyma SPECIFICATIONS
some rental companies like Sonos chose me a long time but its twin prfr 18g550 because of its winding copper is that of the aluminum tape 18g50.
I think the bowl aluminum alloy. is a bit lightweight (small twist the manual can I "did), so to ensure the desired rigidity mcanique by the action of the membrane, and the weight of the moving magnet and I am afraid this is just but I hope it's a feel challenged by my training as a boilermaker (accustomed to booms))) booms))) loll.
have this speaker in his luggage can travel far without fear of failure due to lack of ressources.inch Allah.

OVERALL OPINION

I built four houses like those on offer by Beyma page B-3 01 / 3 and already I have the curious who come to judge the company. I open the edifice on Sunday for preliminary tests I give them an account crest audio bridge with active filter (250-400 Hz) to the stroller parking.
I tried eminence; Proel; Eighteensound, and a local hp nomex the results are not exactly like those one admires hire more experienced than me.
I pay the Beyma cheaper than those listed and I find that the ratio quality price is unrelated to what I already bought like hp.
Sunday finally seal a friendship that will last long enough j'espre I trust.

My goal: to produce 126 dB at 1 meter in boxes too big to properly sound to the bass drum of a drum and bass (the traditional starting at 40 Hz, not those with an extra string starting at 32 Hz and requiring banks too big for my van).

I simulated calculations many serious HP, including the full range Beyma.
I listened to several achievements, including those based 18G50 (a friend who had done this study before me and had adopted this approach and has produced more than a hundred copies) that give the best sound for a relatively restricted.

My choice fell on 18G50 very effective in a reasonable volume.
As by chance, it is one of the most expensive in Beyma, but significantly cheaper than equivalent high-end brands.

So I calculated, optimized and made two subs speakers in Bass Reflex 120 liters granted to 47Hz.
97 dB/1W/1m linear from 52 to 700/800 Hz 3 db loss at 47Hz, and much more rapidly below.

With HP single most common spider (rear suspension), the moving collapse under their weight, slowly but surely. And one day Mogil the coil rubs on the core of the magnetic circuit.
It is essential to turn the HP 1 / 2 turn each year to counteract the effect of gravity.

As this HP has a double spider, the annual removal is unnecessary.
Personally, I run every 4-5 years as a precaution.

I plug my two subs in parallel (in mono) as the directivity at these frequencies is zero and you do not feel the difference.

I charge a Gemini GXA 1600 amp bridged which is able to send its 1600 Watts into 4 Ohms in bridge.

Filtering at 150 Hz

SOUNDS

Very good sound, well balanced. The serious galore.

126 dB at 1 meter with HP in every 800W until the amp clipped. It's boom boom.

Outdoors, it is understood by far: 500 meters during the day, more than 1 km at night.

OVERALL OPINION

The combination of this amp with two 18G50 Gemini is the best quality / price ratio that one can find. With high reliability and HP side amp.

However, at maximum power, do not increase excessively severe in équalo. The suspensions become consumable items.

Note: the new HP Beyma neodymium has emerged that are almost as well as the 18G50.
They are lighter, which is an argument in transit.

18G50 but still quite valid.

I have long wanted to build a system 3 votes assets. studying the project and to my overall budget, I realized he had to find compromises in systems three votes. I chose the homogeneity between the 3 votes. the aim being to obtain a dynamic range as homogeneous as possible. what good is a bass is capable of shaking soil with a medium crachouillant for not supporting work from 80hertz (for example), and acute out knowing nothing else but the breath beyond 8kh. I could go

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.


SOUNDS

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.


OVERALL OPINION

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.