Hello all,
I've been trying to find some information about Yamaha compression drivers. Google comes up with very little this time.
I have seen the plots of a JA-6681 on the Azura horn and they are pretty spectacular.
I have chanced on a single JA6601 and i'd be very interested to know how it differs from the 81. - and if its worth looking for its pair..
Thanks in advance
james
I've been trying to find some information about Yamaha compression drivers. Google comes up with very little this time.
I have seen the plots of a JA-6681 on the Azura horn and they are pretty spectacular.
I have chanced on a single JA6601 and i'd be very interested to know how it differs from the 81. - and if its worth looking for its pair..
Thanks in advance
james
Hello James,
re: the plots - aren't they just!
I think the JA6681s may be rather different to the 6601, not that I'm familiar with it - can you post some pictures?
I reckon the key advantage of the 6681 is the unusual diaphragm suspension, see:
http://www.azurahorn.com/pages/Yam 6681B diaph_jpg.htm
with beryllium copper fingers - I reckon that really helps to lessen resonances caused by reflection at the dome-surround interface and is in part responsible for the amazing response plot on the 160.
The other thing is that the 160Hz horn may well match the internal flare rate of the 6681
Hope this is of use.
Best,
Chris
re: the plots - aren't they just!
I think the JA6681s may be rather different to the 6601, not that I'm familiar with it - can you post some pictures?
I reckon the key advantage of the 6681 is the unusual diaphragm suspension, see:
http://www.azurahorn.com/pages/Yam 6681B diaph_jpg.htm
with beryllium copper fingers - I reckon that really helps to lessen resonances caused by reflection at the dome-surround interface and is in part responsible for the amazing response plot on the 160.
The other thing is that the 160Hz horn may well match the internal flare rate of the 6681
Hope this is of use.
Best,
Chris
looking good...
Interesting! The 6601 I have looks identical.
http://picasaweb.google.com/jbjbjbjbjb/YamahaJA6601
The diaphragm tests ok. Except for 2 tiny dings at the edge. I wonder if they will cause a problem.
I'll try it out in my 240hz lecleach this weekend. And see if I can emulate those plots!
Anyone got another? some hope...
also in the box was a single Pioneer PD-801. Again, very little comes up on google. Looks quite like a TAD 2001 to me. Which would make sense. Haven't been able to see the diaphragm yet as I don’t have an alan key with me.
Any experts on this one too?
cheers
james
Interesting! The 6601 I have looks identical.
http://picasaweb.google.com/jbjbjbjbjb/YamahaJA6601
The diaphragm tests ok. Except for 2 tiny dings at the edge. I wonder if they will cause a problem.
I'll try it out in my 240hz lecleach this weekend. And see if I can emulate those plots!
Anyone got another? some hope...
also in the box was a single Pioneer PD-801. Again, very little comes up on google. Looks quite like a TAD 2001 to me. Which would make sense. Haven't been able to see the diaphragm yet as I don’t have an alan key with me.
Any experts on this one too?
cheers
james
Interesting! The 6601 I have looks identical.
Picasa Web Albums - op.9 - yamaha JA6601
The diaphragm tests ok. Except for 2 tiny dings at the edge. I wonder if they will cause a problem.
I'll try it out in my 240hz lecleach this weekend. And see if I can emulate those plots!
cheers
james
Martin has some gentle EQ on the top end to flatten it on his horns.
It will be good to know what it does without EQ on the the L'Cs...
_-_-bear
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- Loudspeakers
- Multi-Way
- Yamaha Compression drivers