OffTopic (Drive Units)
Thanks Bert. You finally saw my post ! :wink:
Xmax is 7mm.
If Xmax is 7mm, then either Vd is 599 (not 513), or Sd is 733. So I'll take that Vd is 599. Maybe you can change that in BD15's technical data ?
If you would build a dampened reflex enclosure then the group
delay isn't so bad.... the bigger enclosure gives a nice gradual roll-off
which can be EQ-ed more simple and less strong (saving some power on the
amps).
Understood. So you advice some dampening. Just FYI, I had heard other people advisind not to dampen bass drivers at all.
I never did any distortion plots on the BD15's so I can't help you with
that. I am sure that they will give a lot of second harmonic distortion
when they are moving a lot...
My ears made the selection for the used paper cone, stiffness, surround,
spider, coil (and former) and magnet strength. I have had several
prototypes here and the BD15 came out most balanced in terms of audible
distortion and dynamical behaviour related to the Q, etc.
Yes, I do understand, and I'm quite convinced that the BD15 is one of the top drivers ahead of the rest. No problem about that. Still I think it would do justice to the BD15 if you think about doing some measuring one day. No offense intended of course.
The real problem is that for a new customer like me it's very difficult to actually hear a BD15 (it remains a quite confidential driver and we can't find it in stores other than yours, can we ? ). That means we often have to choose it without actually hearing it. :shame: And for that, well, at least a bit more technical documentation with some measuring would be good. The small BD15 PDF really lacks some information IMHO. That's a pity because an excellent driver really deserves a good documentation, don't you think ? (well, maybe you don't... ).
Hey, maybe one of the current BD15 owners and would be able to do some measuring so that everyone can benefit from it ? That would surely be very nice (at least it would be better than nothing). IMHO of course.
Just my two cents...
Complete thread:
- OffTopic - Jose Hidalgo, 2007-04-18, 17:41
- OffTopic - Bert, 2007-04-18, 18:23
- OffTopic - Jose Hidalgo, 2007-04-18, 18:50
- OffTopic - PeterSt., 2007-04-18, 21:17
- OffTopic - Jose Hidalgo, 2007-04-18, 18:50
- OffTopic - Eddie, 2007-04-18, 20:01
- OffTopic - Jose Hidalgo, 2007-04-18, 20:54
- OffTopic - Bert, 2007-04-18, 22:00
- Frustation... - Bert, 2007-04-18, 22:59
- Frustation... - PeterSt., 2007-04-18, 23:53
- Frustation... - Jose Hidalgo, 2007-04-19, 02:10
- Frustation... - Bert, 2007-04-19, 09:06
- OffTopic - Jose Hidalgo, 2007-04-18, 20:54
- OffTopic - GC, 2007-04-19, 06:47
- OffTopic - Bert, 2007-04-18, 18:23