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Author Topic: Replacement Boston Acoustic A70 woofer Jeremy Weigel Phenomenal Film Handler Posts: 1062 From: Edmond, OK, USA Registered: Mar 2007 posted 01-06-2013 07:42 PM                     Anybody have the specs on the woofer in the Boston Acoustic A70? I have one that is blown and looking for a replacement.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 01-06-2013 08:27 PM                        I have used an Eminence 8" round speaker with a large magnet as a direct replacement for years. The one I used in the Entertainment Engineering monitors. (I don't have any more speakers.) Actually any large magnet, robust 8" speaker should be fine. Most thought the sound was a little better. louis  |  IP: Logged Jeremy Weigel Phenomenal Film Handler Posts: 1062 From: Edmond, OK, USA Registered: Mar 2007 posted 01-06-2013 10:37 PM                     Thanks for the info Louis.  |  IP: Logged Jeremy Weigel Phenomenal Film Handler Posts: 1062 From: Edmond, OK, USA Registered: Mar 2007 posted 01-10-2013 11:48 AM                     Update: I pulled another driver to double check ohm rating with a meter since there isn't any info stamped on them. They are a 4ohm driver. I found this unit Simply Speakers. Seems like a fairly robust unit. Thoughts? Anyone used Goldwood brand drivers?  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 01-10-2013 03:33 PM                        An ohmmeter measures impedance at DC; the speaker impedance is at 1000 cycles. they are 8 ohm speakers. louis  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 01-10-2013 04:26 PM                     Yep. 8 Ohm. We just replaced 16 of them.  |  IP: Logged Jeremy Weigel Phenomenal Film Handler Posts: 1062 From: Edmond, OK, USA Registered: Mar 2007 posted 01-10-2013 08:40 PM                     quote: Louis Bornwasser An ohmmeter measures impedance at DC; the speaker impedance is at 1000 cycles. they are 8 ohm speakers. A little confused now. I've always been told you can measure the impedance of a speaker with an ohm meter. And they are usually really close to stated rating; within a few hundredths, certainly not by half. A little more info on the speaker. They are BA A70T's with a stamped overall rating of 6 ohms and a sensitivity of 90dB. This stamped on the upper right corner of the cabinet face. I get a measurement of 5.89 ohms with my meter.  |  IP: Logged Ron Lacheur Jedi Master Film Handler Posts: 650 From: British Columbia, Canada Registered: Feb 2002 posted 01-10-2013 09:10 PM                     They are definitely 8 Ohm. The DC resistance you have measured lines up with standard 8 ohm drivers, which usually is around 5.5 to 6.3ohms, but can be as high as 8.  |  IP: Logged

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