could someone take a look at this driver please ?

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   http://bmsspeakers.com/cone-speaker-compression-driver/bms-neodymium-cone-speakers/bms-neodymium-cone-low-mid/bms-8n515-neodymium-cone-driver/8n515-cone-driver-introduction/

..... and interpret the T/S parameters, with a view to suitability for a boombox/ghettoblaster type thang.

Envisaging something around 50cm x 25cm x 20cm overall size (accomodating 2 drivers) - so enclosure volume would be around 10 liters per driver - reflex loaded, tuned to about 70Hz as per the pdf.

Why do they have details "4 ohm driver" when the stated nominal impedance is 8 ohm ? Does this imply a 4 ohm version is available (which is what I would ideally want).

Many thanks .....

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slaz Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713	Post Options Post Reply Quote slaz Report Post Thanks(0) Quote Reply Topic: could someone take a look at this driver please ? Posted: 09 April 2011 at 10:17am
	http://bmsspeakers.com/cone-speaker-compression-driver/bms-neodymium-cone-speakers/bms-neodymium-cone-low-mid/bms-8n515-neodymium-cone-driver/8n515-cone-driver-introduction/ ..... and interpret the T/S parameters, with a view to suitability for a boombox/ghettoblaster type thang. Envisaging something around 50cm x 25cm x 20cm overall size (accomodating 2 drivers) - so enclosure volume would be around 10 liters per driver - reflex loaded, tuned to about 70Hz as per the pdf. Why do they have details "4 ohm driver" when the stated nominal impedance is 8 ohm ? Does this imply a 4 ohm version is available (which is what I would ideally want). Many thanks .....

Saturnus Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 13 July 2010 Location: Copenhagen Status: Offline Points: 2025	Post Options Post Reply Quote Saturnus Report Post Thanks(0) Quote Reply Posted: 09 April 2011 at 10:32am
	Optimum tuning for indoors use in medium sized room (Q=0.7) is about Vb=4 and Fb=120. The more you increase the box size the lower the Q will become and the more unsuited for outdoors use it will be. Unfortunately decreasing the box size to get higher Q will also mean it won't go as low. Estimated F3 outdoors with optimum tuning would be around 190Hz for this driver. My verdict is, completely useless for that purpose.