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Beyma 18G50
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Published on 06/09/07 at 03:38
Value For Money : Excellent
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.