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<blockquote data-quote="Peter Morris" data-source="post: 212510" data-attributes="member: 652">The BMS was the perfect driver for the PM90/60 because it could produce high SPL and operate down to the&nbsp; low frequency (600-700 Hz)&nbsp; need to mate with the low frequency bent horn&nbsp; while still having pristine VHF up to about 20KHz.I believe BMS Patented this technology in 1997 and patent has has now expired. It was a great idea that worked very well.Over the last 20 years there has been a lot advances in computer modelling techniques and materials that should allow B&amp;C to produce a much better driver based on this idea of having two co-entrant sources, HF +VHF exit through the same horn throat.There were however a few issues with this design that I&#039;m sure B&amp;C were aware of and I suspect have improved.&nbsp; As a result I also expect this new B&amp;C driver will be better -&nbsp; louder, lower distortion, better water fall plots&nbsp; etc. and make the PM90/60 even better <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=";)" title="Wink&nbsp; &nbsp; ;)"&nbsp; data-smilie="2"data-shortname=";)" />?… so I have a some on order to try.</blockquote>

[QUOTE="Peter Morris, post: 212510, member: 652"] The BMS was the perfect driver for the PM90/60 because it could produce high SPL and operate down to the low frequency (600-700 Hz) need to mate with the low frequency bent horn while still having pristine VHF up to about 20KHz. I believe BMS Patented this technology in 1997 and patent has has now expired. It was a great idea that worked very well. Over the last 20 years there has been a lot advances in computer modelling techniques and materials that should allow B&C to produce a much better driver based on this idea of having two co-entrant sources, HF +VHF exit through the same horn throat. There were however a few issues with this design that I'm sure B&C were aware of and I suspect have improved. As a result I also expect this new B&C driver will be better - louder, lower distortion, better water fall plots etc. and make the PM90/60 even better ;)? … so I have a some on order to try. [/QUOTE]

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