Multiple driver MMT calculation question - diyAudio
 Multiple driver MMT calculation question
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 Multi-Way Conventional loudspeakers with crossovers

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 4th August 2008, 12:40 PM #1 diyAudio Member   Join Date: Aug 2008 Multiple driver MMT calculation question Hello there, Yes I am a newb here. I am trying to design a speaker and I need some help with the equations. I have built speakers before but it has been a long time (10+ years) and I have misplaced my speaker building books. So I was looking at a Morel tweeter and it had an efficiency of 92.5 db @2.83 V at 1 meter. My initial though was to just match that to a good woofer and move onto the X-over design. That was my problem. No matter what driver I looked at I could not find one with high enough sensitivity. So if I were to take 2 drivers, how do I calculate the sensitivity? (Like 2 at 89 db?) Alternately if I take four 8 ohm drivers (86 db?) and put them in a series parallel configuration to give me a net result of 8 ohms... compared to a single driver what would the 2.83V sensitivity be? I have been looking for these basic formulas now for a while and have come up empty with my searches so any help would be greatly appreciated. Yes I know these are basic questions and really I should know this stuff but please do not flame me over this. Hoping there are no trolls on this board, John
 4th August 2008, 01:16 PM #2 diyAudio Member   Join Date: Mar 2008 Hi, in brief, comparison to single driver: 2 equal drivers in parallel +6db voltage sensitivity 2 equal drivers in series +/- 0db " " 4 equal drivers in series/parallel +6db " " may someone correct me, if i was wrong ... Preassumptions: Drivers small compared to wavelength. Drivers mounted as near as possible. Kind regards __________________ Oliver, RFZ believer (?) www.dipol-audio.de
 4th August 2008, 01:30 PM #3 diyAudio Member   Join Date: Nov 2003 Location: Brighton UK Hi, And due to baffle step you need 98.5dB/ 2.83V@1m halfspace for 92.5 midband. FWIW you attenuate mid and treble back to the level set by bass. /sreten.
 4th August 2008, 01:31 PM #4 diyAudio Member   Join Date: Nov 2003 Location: Brighton UK Hi, FWIW you attenuate mid and treble back to the level set by bass. They are not the same levels due to baffle step. /sreten.

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