Vol'ti - v. - to turn over a new leaf; to move forward
BMS Midrange Compression Drivers

BMS Midrange Compressions drivers are among the finest sounding in the world.  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.   Because of the increased sensitivity and lower distortion, much lower crossover points can be used.   The BMS neodymium drivers offer a more defined sound than the ceramic drivers - a function of higher flux density and less flux variation.

The BMS 4592ND-MID 16ohm driver is the best sounding driver we sell for upgraded Klipsch Khorn and Belle speakers.

They extend down to 300Hz, and cover up to 6500Hz cleanly.
They have a very clear sound with great definition and detail.  The sound from the combination of the BMS drivers and the Volti horns is effortless, relaxed, and natural.

Cost is $1,300 per pair plus shipping.

The ceramic magnet version of the 4592 is the 4591-MID 16ohm, and even though it is the older version of this series, it is still available for purchase.

These weigh a LOT more than the 4592, but have the same diaphragm and phase plug.   The sound quality is very close to the 4592, so if your budget needs to be stretched, and you still want the BMS quality, these might be a good option.

Cost is $800.00 per pair plus shipping.

The BMS drivers listed above are stocked in 16ohm versions, but are also available in 8ohm versions.  Please email me to check on availability.

PLEASE NOTE - The V-TracII horns utilize only two of the four mounting screws for these drivers.   Two screws are more than enough to hold the weight of the lighter 4592 driver, but it is not known if two screws is adequate for holding the weight of the heavier 4591 driver.  Volti Audio assumes no responsbility for damage or loss due to failure of the screws holding the heavier 4591 drivers to the motorboard, or the motorboard to the horn when used with the V-TracII horns.  All risk associated with the use of the heavier and lower cost 4591 driver rests with the purchaser and end user.

I'm often asked if it is worth spending $500 more for the neo version of the BMS driver.  It's not an easy question to answer.  If the difference in cost was $200, it would be a no-brainer, and if the difference in cost was $1,000, that too would be a no-brainer!  I suppose that means that BMS has figured out exactly how much more thay can charge for the 4592's.

Here's how I look at it.  The 4592's are a bit better.  I know these are the drivers I want, and I'm the type of person that will find a way to afford to buy the better drivers.   For me, it's as much about having the lighter, more refined, newer drivers as much as it is about the increase in quality of sound.  Do it once, do it right, and be done with it.

But I certainly can't fault anyone for being on a tight budget, and looking at the $500 in savings as a way to buy $500 more music to listen to.  The end result of buying the less expensive 4591 drivers will still be a huge improvement over the stock Klipsch drivers in every way.

I sent an email to my distributor, who has a lot of experience listening to both of these drivers, and I asked him to give me his thoughts on the two drivers and the cost difference between them.   Here's what he wrote to me:

The difference is in the power structure of the magnets.  The neo has less flux density variation, depending on where you are in the power curve.  This means that the neo sounds more defined, and the ceramic a bit harsher.  It is also a linear function, so it is noticeable even at low levels, not just when pushed hard.

The neo has a different power curve than ceramic.   So the engineers have more options when designing the driver.  For instance, EV designs their drivers to sound more the same from neo to ceramic, so one can interchange drivers from system to system.  BMS has chosen to utilize a different part of the curve, specifically to take advantage of this, and have a better sounding driver in the 4592, not just lighter.

And then there is the real question, is it worth it?  Is there a thirty something percent difference?

The law of diminishing returns is in effect.   There is a noticeable difference to me.   A distinguishable difference.  But not a 35% difference.   But worth it to me.

Volti Audio - Klipsch Khorn V-Trac Upgrades and Restoration