Located in Hannover Germany, BMS manufactures and designs compression drivers of high and mid-high frequency range for pro audio applications along with cones, horns, coaxials, and a planar wave device. BMS precision drivers are used in professional speakers, cinema sound systems, stage monitors, recording studio monitors, home theater, high end audiophile speakers, and test systems. BMS designs and manufactures OEM compression drivers for many well known, highly respected pro audio speaker manufacturers throughout the world. Chances are you have already heard BMS drivers.
Why do they sound better?
BMS has developed and patented a unique, domeless diaphragm with less mass than a traditional diaphragm, remarkably reducing diaphragm excursion and inertia. It has exceptional dynamic range and produces even the most complex musical signals with depth and definition. BMS drivers require much less energy than conventional diaphragms, allowing a much higher SPL, less dynamic compression, an increase in transient response, and lower harmonic distortion than traditional designs. With reduced excursion and excellent transient response, BMS drivers react extremely quickly to peak level signals and have high crest factors. The result is an increase in dynamic headroom and precise definition. An additional BMS benefit is a system that is more "single point source", especially when using the dual motor, mid/high 2" exit drivers. Because of the increased sensitivity and lower distortion, much lower crossover points can be used. With more of the frequency spectrum coming from a single point, the quality of sound is more focused and less smeared. The BMS neodymium drivers offer a more defined sound than the ceramic drivers. This is a function of higher flux density and less flux variation.
Assistance Audio & BMS
Assistance Audio is the North American distributor for BMS, with customers throughout the United States, Canada, and Mexico. We can drop ship large quantities anywhere using international airports. We are dedicated to bringing BMS to the masses.
Why don't they cost more?
1) BMS drivers are made with an innovative design. The diaphragms are small and are made with polyester, not special (expensive) metals. By improving some basic flaws in driver design, instead of trying to make a better full diaphragm dome, BMS improves the performance and reduces the cost of manufacturing. The neodymium drivers cost more and offer a more defined sound than the ceramic magnets.
Why don't they cost less?
One of BMS's guiding principals is; the best value, not the cheapest product. BMS has become a pioneer in manufacturing techniques in order to get the quality of diaphragm they (and their customers) want. Recently BMS licensed the patent to a major US speaker company that has been manufacturing drivers for decades in an effort to save money on shipping and import duty. Try as they might, this company could not replicate the BMS diaphragm. Now they manufacture the magnet assembly and import the diaphragms from the BMS factory in Germany. If you need the cheapest driver possible, buy a knock off from the east. If you want a great sounding driver at the best value, BMS is for you.
The Bottom Line
We liked BMS so much that we became the largest direct purchaser and end user of BMS products in the USA. Sadly, too many products in the audio industry are sold by hype and name recognition. BMS is a product that actually delivers as it is described. BMS is used in many speaker boxes as OEM products. Our mission is to also bring what we feel are the best drivers in the world to the small, independent user.
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Hearing is Believing.
|Nominal Impedance||8 Ω||8 or 16 Ω||8 or 16 Ω||8 or 16 Ω||8 or 16 Ω||8 or 16 Ω||8 or 16 Ω|
|Frequency Range (Hz)||1.2kHz-30kHz||1.2kHz-30kHz||1.2kHz-30kHz||500Hz-20kHz||500Hz-20kHz||500Hz-20kHz||500Hz-20kHz|
|Recommended Crossover||1.9 kHz||1.9 kHz||1.9 kHz||1.2 kHz||800 Hz||1 kHz||1 kHz|
|Sensitivity on horn 1w/1m||113 dB (90x75)||114 dB (90x75)||114 dB (90x75)||114 dB (90x75)||113 dB (90x75)||113 dB (90x75)||115 dB (120x10)|
|Power Capacity (AES)||25W||60W||60W||80W||80W||80W||80W|
|Flux Density (Tesla)||1.6||1.9||2.2||1.9||2||2.2||2.2|
|Voice Coil Diameter||1"||1.5"||1.5"||1.75"||1.75"||1.75"||1.75"|
|Mounting||2 bolt/5mm||2 bolt/5mm||threaded||2 bolt/6mm||2 bolt/6mm||2 bolt/5mm||screw holes|
|Nominal Impedance||8 or 16 Ω||8 or 16 Ω||8 or 16 Ω||8 or 16 Ω||8 or 16 Ω||8 or 16 Ω||8 or 16 Ω|
|Frequency Range (Hz)||500Hz-20kHz||500Hz-20kHz||200Hz-9kHz||200Hz-22kHz||200Hz-22kHz||200Hz-22kHz||200Hz-22kHz|
|Sensitivity on horn 1w/1m||113dB (90x75)||113dB (90x75)||118dB (40x20)||118dB (40x20)||118dB (40x20)||118dB (40x20)||118dB (40x20)|
|Power Capacity (AES)||80W||80W||150W||80/150W||80/150W||80/150W||80/150W|
|Flux Density (Tesla)||2.0||2.0||1.9||1.9||2.0/1.95||2.0/1.95||2.0/1.95|
|Voice Coil Diameter||1.75"||1.75"||3.5"||3.5" / 1.75"||3.5" / 1.75"||3.5" / 1.75"||3.5"/1.75"|
|Mounting||4 bolt/6mm||4 bolt/6mm||4 bolt/6mm||4 bolt/6mm||4 bolt/6mm||4 bolt/6mm||4 bolt/6mm|
All voice coils copper clad aluminum. Two layers inside and outside the VC except 4538 and 4540ND one layer.
A passive (6.5khz) crossover is available for the coaxial drivers. Note the screws for mounting directly to holes on the back of the 4590. Crossovers are $25ea and work with the coaxial versions of the 4590 4594, 4595 & 4592.
BMS also manufactures horns. We typically have all models in stock. Any BMS horn is available as part of our speaker kits.
|Model||Price||Dispersion||Low Frequency Cut Off||Size|
|BMS 2193||$47.00||8.5" x 4.5" x 2.75"|
|BMS 2119||$62.00||90 x 40||1000 Hz||11.8" x 6.7" x 4.5"|
|BMS 2230||$104.00||90 x 55||700 Hz||12.8" x 9.1" x 4.6"|
|BMS 2250||$135.00||50 x 55||700 Hz||11" x 9" x 11.1"|
|BMS 2236||$165.00||60 x 40||400 Hz||19" x 13.8" x 10.4"|
Replacement diaphragms are available for any BMS drivers, or BMS manufactured diaphragms
|Driver||Diaphragm Model||Cost||Driver||Diaphragm Model||Cost|
|BMS 4538||M4538 (8 or 16)||$65.00||BMS 4554||M4554 (8 or 16)||$82.50|
|BMS 4540||M4540 (8 or 16)||$72.50||BMS 4555||M4555 (8 or 16)||$82.50|
|BMS 4544||M4544 (8 or 16)||$70.00||BMS 4590(h)||MH4590 (8 or 16)||$61.00|
|BMS 4548||M4548 (8 or 16)||$81.25||BMS 4590(m)||M4590 (8 or 16)||$115.00|
|BMS 4549||M4549 (8 or 16)||$75.00||BMS 4592(h)||MH4592 (8 or 16)||$81.25|
|BMS 4550||M4550 (8 or 16)||$81.25||BMS 4592(m)||M4592 (8 or 16)||$212.50|
|BMS 4552||M4552 (8 or 16)||$90.00||BMS 4510||M4510 (8 or 16)||$90.00|
How To Order
Contact us to order, demo, or for more information.
We don't just sell them, we use them
Assistance Audio first learned about BMS at NAMM in 2000. We liked what we heard and bought some. Initially, we began simply replacing JBL 2450s in some of our front of house speakers. The difference was astounding. The speakers with BMS were much more efficient, clearer, and cleaner. The BMS are so efficient we were not using the HF amps very much at all. To make better use of our power, we lowered the crossover point, which was very foreign to us as a lifetime 10” midrange company. We were used to using cones to cover as much spectrum as possible, both for speaker protection and sound quality. BMS reversed our thinking. The BMS were much clearer in the 700-1200 range than the 10”, and were missing the “gack” or overring that the JBL compression drivers have. The BMS breathed new life in our whole system. Soon we went about replacing all the old drivers and selling them on eBay. We began utilizing DDS horns to fully realize the BMS potential. Our new systems are designed around the BMS and DDS. To improve our buying power, we became the largest non-OEM user of BMS in North America in 2001.
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