mashaffer
Super Member
Years ago I built these Open Baffle Table Speakers using Goldwood 10" OEM woofers (https://www.parts-express.com/goldwood-gw-210-8-10-oem-woofer-8-ohm--290-325) and old Radioshack 12-1848 5" Fullranges that I had lying about.
The drivers were not very well balanced and the FRs had almost nothing below 200Hz (probably old stiff suspension) but I cobbled together a sort of bi-amp setup that made them work. The sound stage was actually quite sweet.
Having some nice Mark Audio CHR-70s that I have been experimenting with I thought that they might be made to blend well with the woofs. I added a 9mH inductor in series with the woofs and set the MAs (in small enclosures) on top and gave a listen. Promising but even the MAs were a bit more efficient than the GWs. I knocked up 9.5dB pads with a 250uF blocking cap (70-100uF would no doubt be better but 250 is what I had on hand) and the results are quite satisfying. I listened for a few hours to various genres and the balance is very good with the tone controls set flat. With the Sony V4 power meter indicating 1W average the output was comfortably loud but probably not efficient enough for a 2W SET. However once I get the MAs mounted I plan to try my KT88 SEUL.
I expect some tweeking of the crossover may be necessary with the MAs on baffle but I am encouraged with the results so far.
The drivers were not very well balanced and the FRs had almost nothing below 200Hz (probably old stiff suspension) but I cobbled together a sort of bi-amp setup that made them work. The sound stage was actually quite sweet.
Having some nice Mark Audio CHR-70s that I have been experimenting with I thought that they might be made to blend well with the woofs. I added a 9mH inductor in series with the woofs and set the MAs (in small enclosures) on top and gave a listen. Promising but even the MAs were a bit more efficient than the GWs. I knocked up 9.5dB pads with a 250uF blocking cap (70-100uF would no doubt be better but 250 is what I had on hand) and the results are quite satisfying. I listened for a few hours to various genres and the balance is very good with the tone controls set flat. With the Sony V4 power meter indicating 1W average the output was comfortably loud but probably not efficient enough for a 2W SET. However once I get the MAs mounted I plan to try my KT88 SEUL.
I expect some tweeking of the crossover may be necessary with the MAs on baffle but I am encouraged with the results so far.