Guest tonedeaf Posted September 9, 2008 Report Share Posted September 9, 2008 Im looking to repair my A-150's. The surrounds have gone away. I am deciding to try refoaming or trying to find a replacement woofer. Does anyone have the specs on the orig woofer? Also how do I tell if mine is a series I II III? Thanks Link to comment Share on other sites More sharing options...
justw Posted September 14, 2008 Report Share Posted September 14, 2008 Im looking to repair my A-150's. The surrounds have gone away. I am deciding to try refoaming or trying to find a replacement woofer. Does anyone have the specs on the orig woofer? Also how do I tell if mine is a series I II III? ThanksI refoamed my woofers about a year ago. As a backup I checked and BA still sold replacement woofers for $60.The refoam job was easy and they sound like new. Link to comment Share on other sites More sharing options...
Guest tonedeaf Posted September 15, 2008 Report Share Posted September 15, 2008 I refoamed my woofers about a year ago. As a backup I checked and BA still sold replacement woofers for $60.The refoam job was easy and they sound like new. Hello Justw, I tried to purchace them from BA, I was told NLA now. Anyhow which foam rings worked well for you? Thanks tonedeaf Link to comment Share on other sites More sharing options...
Mazeppa Posted October 13, 2008 Report Share Posted October 13, 2008 I'm jumping in as I also have a pair of A150 woofers that I'm even now cleaning up for surround replacement. This will be my first attempt at a refoam job. I'll be watching for the foam material recommendation.Other questions: My A150s had been retrofitted w/some JBL woofers (sound very good) before I bought them and the original woofers were included. I want to ensure correct polarity for when I'm ready to reinstall the originals if my refoam job works out. The connection tabs themselves are unmarked, but there is a paper sticker with a date (Jan 1983) w/a red dot on the sticker adjacent to one side of the connection tabs.1. Does the location of the red dot indicate positive connection point?2. Can the Series of my speakers be determined by the date on the woofer sticker? If so, what have I got?Really appreciate the info and encouragement available at Classic Speaker Pages. Link to comment Share on other sites More sharing options...
justw Posted November 13, 2008 Report Share Posted November 13, 2008 I'm jumping in as I also have a pair of A150 woofers that I'm even now cleaning up for surround replacement. This will be my first attempt at a refoam job. I'll be watching for the foam material recommendation.Other questions: My A150s had been retrofitted w/some JBL woofers (sound very good) before I bought them and the original woofers were included. I want to ensure correct polarity for when I'm ready to reinstall the originals if my refoam job works out. The connection tabs themselves are unmarked, but there is a paper sticker with a date (Jan 1983) w/a red dot on the sticker adjacent to one side of the connection tabs.1. Does the location of the red dot indicate positive connection point?Generally, yes. Verify with a 1.5 volt D cell battery. The cone will move forward when + is on the +.2. Can the Series of my speakers be determined by the date on the woofer sticker? If so, what have I got?I'm no expert on the BA stuff.Really appreciate the info and encouragement available at Classic Speaker Pages.As for the foam I used, I PM'd both of you.Good Luck with your project. (I really need to check this board more often...) Link to comment Share on other sites More sharing options...
Carlspeak Posted January 27, 2009 Report Share Posted January 27, 2009 I recently refoamed two Series III graphite woofers and tested them with the WT3.Re=3.6 ohmsFs = 23 hzQts = .50Vas = 7 Cu. Ft.Sens. = 88.2 dB @ 1W/1MQes = .560Le = .61 mHI'll be sketching the crossover as well and will post soon. Link to comment Share on other sites More sharing options...
Guest tonedeaf Posted January 27, 2009 Report Share Posted January 27, 2009 I recently refoamed two Series III graphite woofers and tested them with the WT3.Re=3.6 ohmsFs = 23 hzQts = .50Vas = 7 Cu. Ft.Sens. = 88.2 dB @ 1W/1MQes = .560Le = .61 mHI'll be sketching the crossover as well and will post soon. Thanks Carlspeak for the woofer specs. Tonedeaf Link to comment Share on other sites More sharing options...
Carlspeak Posted January 29, 2009 Report Share Posted January 29, 2009 Here is the A150 Series III schematic I promised. All of the caps are NPE's except the 3.3 uF tweeter series cap which appears to be a film type.Resistors are all sand cast types.Boston_Acoustics_A150_series_III_schematic.pdf Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.