Bose AM5 impedance ?

ashok · 16th June 2006, 02:35 AM

Does anyone know the impedance of the small Bose AM5 modules ? Has anyone ever measured the impedance over the full bandwidth ? I haven't seen one on the Net.

What is the sensitivity of the modules ....86db/watt ?
Thanks.
Ashok.

kevinkr · 16th June 2006, 09:27 PM

IIRC the old AM5 had dual driver satellites (the direct/reflecting satellite) - if this is the case the nominal impedance is 8 ohms, single driver sats 4 ohms. Impedance minima again IIRC would be somewhat greater than 3 ohms for a single 6 ohms for a dual. The drivers were wired in series. I don't remember anything about max impedance though, nor how flat through the passband the response and impedance was. Not great in any case... These drivers should have copper shunts on the pole pieces to flatten out impedance variations and improve linearity, but u can't check without destroying the driver.. Ones from powered speakers systems do not have the copper pole piece shunt and should not be subbed - their fr without eq is BAD..

16th June 2006, 02:35 AM	#1
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Bose AM5 impedance ? Does anyone know the impedance of the small Bose AM5 modules ? Has anyone ever measured the impedance over the full bandwidth ? I haven't seen one on the Net. What is the sensitivity of the modules ....86db/watt ? Thanks. Ashok. __________________ AM

16th June 2006, 09:27 PM	#2
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	IIRC the old AM5 had dual driver satellites (the direct/reflecting satellite) - if this is the case the nominal impedance is 8 ohms, single driver sats 4 ohms. Impedance minima again IIRC would be somewhat greater than 3 ohms for a single 6 ohms for a dual. The drivers were wired in series. I don't remember anything about max impedance though, nor how flat through the passband the response and impedance was. Not great in any case... These drivers should have copper shunts on the pole pieces to flatten out impedance variations and improve linearity, but u can't check without destroying the driver.. Ones from powered speakers systems do not have the copper pole piece shunt and should not be subbed - their fr without eq is BAD.. __________________ www.kta-hifi.net

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