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RE: "So for a horn loaded driver, round up the DC resistance to the next higher standard: i.e. 8 or 16 Ohms."

44mm (1.75") voice coil and diaphragm are pretty much standard for a 1" driver and is the same as the Beyma driver I mentioned elsewhere and all other Beyma 1" bolt-on cds.
They were also measured on a horn but the difference between Re and minimum impedance is far less: 4.7 and 5.2Ohm giving 0.5Ohm difference while the very similar JBL gives 1.7Ohm for the 8Ohm version and 2.5 for the 16.
That said one of theirs (SMC-225Nd) has an Re that is actually higher then its minimum impedance. Not sure what I should make of that, some kind of resonance may be.


Not that it would really matter much to me since I'd run them active and then the exact impedance matters very little except for roughly working out headroom/SPL with any given amp. ;-)


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  • RE: "So for a horn loaded driver, round up the DC resistance to the next higher standard: i.e. 8 or 16 Ohms." - b.l.zeebub 16:15:01 07/22/16 (1)

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