So my Airline 2509-A is on the bench. I've been having so much fun repairing it, and have brought it back to specs, and it sounds wonderful, as is, but I've got the bug, and I know there's more to be had.
Can anyone recommend any mods upgrades to this little guy?
On the list is reconing/replacing the 4 ohm 8" oxford drivers. Posible candidates are:
4 ohm Jensen P8R - AlNiCo Guitar driver, almost EXACTLY the same Frequency response as the oxfords, great sensitivity, about $120 per piece, but very period correct for restoration.
I have a couple of 4ohm 10" Marantz ceramic magnet woofers from a wrecked pair of HLM-310s with a lower sensitivity (I think about 88 db vs the Jensen's 92) but MUCH flatter response.
The cabinet has been stripped, imperfections filled, and sanded, and will be getting re-stained and fresh grille cloth should be on its way soon.
If you owned this cabinet, what would YOU do to make it shine? No limits
Can anyone recommend any mods upgrades to this little guy?
On the list is reconing/replacing the 4 ohm 8" oxford drivers. Posible candidates are:
4 ohm Jensen P8R - AlNiCo Guitar driver, almost EXACTLY the same Frequency response as the oxfords, great sensitivity, about $120 per piece, but very period correct for restoration.
I have a couple of 4ohm 10" Marantz ceramic magnet woofers from a wrecked pair of HLM-310s with a lower sensitivity (I think about 88 db vs the Jensen's 92) but MUCH flatter response.
The cabinet has been stripped, imperfections filled, and sanded, and will be getting re-stained and fresh grille cloth should be on its way soon.
Attachments
The schematic shows an output impedance of 8 Ohm. But you write about 4 Ohm Oxford loudspeakers being in it now. Are you sure those are the original loudspeakers?
Yes, I am positive that these are the original drivers for the cabinet. If you're unaware impedance can be matched depending on how the drivers are wired. This unit shipped with two 4ohm 8 inch drivers and one 8ohm 3.5 inch tweeter. Impedance matching isn't really an issue.
OK. Then I assume the two 4 Ohm speakers are connected in series (the schematic only shows "LS 1" for the low tones).