|
Home | Forums | Rules | Articles | diyAudio Store | Blogs | Gallery | Wiki | Register | Donations | FAQ | Calendar | Search | Today's Posts | Mark Forums Read | Search |
Multi-Way Conventional loudspeakers with crossovers |
|
Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving |
![]() |
|
Thread Tools | Search this Thread |
![]() |
#3371 |
diyAudio Member
Join Date: Dec 2004
Location: Novi, Michigan
|
There is never any "wisdom" in Romy's rants.
__________________
Earl Geddes Gedlee Website |
![]() |
![]() |
#3372 |
diyAudio Member
Join Date: Dec 2004
Location: Novi, Michigan
|
From where I sit thats not true.
__________________
Earl Geddes Gedlee Website |
![]() |
![]() |
#3373 |
diyAudio Member
Join Date: Jul 2005
Location: sydney nsw
|
The point I would make is that the concept of constant directivity is not the same thing as the mechanism used to achieve it.
It is possible to achieve c.d. and minimise diffraction and higher mode production. This is amply demonstrated in the data refered to and posted in these pages, for both compression drivers and dome radiators. rcw. |
![]() |
![]() |
#3374 | |
diyAudio Member
Join Date: Oct 2006
Location: San Diego
|
Quote:
I really like the BMS ring radiators. * yes, I know there are compression drivers that go to 20khz. The difference is that they get the output up high via diaphragm resonances, which sounds raspy to my ears |
|
![]() |
![]() |
#3375 | |
diyAudio Member
Join Date: Oct 2006
Location: San Diego
|
Quote:
http://www.audiokarma.org%2Fforums%2...%3Fp%3D3057229 If I can squeeze them into the car, I'll be bringing my Summas up too. Should be interesting. I've managed to cram them into my car before, but it's tricky... Info on the car is here: http://www.diyaudio.com/forums/showt...hreadid=148006 If anyone is in the area, would be great to discuss waveguides, horns, etc... Should be a fun show. |
|
![]() |
![]() |
#3376 | |
diyAudio Member
Join Date: Dec 2004
Location: Novi, Michigan
|
Quote:
The bottom line however is that there aren't different ways to achieve CD. You can easily do the inverse problem to calculate what is required from the source to achieve ideal CD in the far field and there aren't two solutions. There are different approximations that one can make that lead to slightly different configurations, but there are not that many options. Basically, I don't see how a dome can achieve CD in any configuration. I know you claim that it can be done using this or that technique, but stated quite simply, I haven't seen it practice yet. And until thats been done its all hypothetical.
__________________
Earl Geddes Gedlee Website |
|
![]() |
![]() |
#3377 |
diyAudio Member
Join Date: Dec 2004
Location: Novi, Michigan
|
Wouldn't this have to be true of all compression drivers? No diaphragm is going to 20 kHz and above with NO resonances. How well are they controlled is the issue. And I suspect that most of the problem above 10 kHz is acoustic - its very hard to get those frequencies out of the device. They tend to rattle arround inside - they don't want to come out to play. Thank goodness that they have so little effect on the total sound quality.
__________________
Earl Geddes Gedlee Website |
![]() |
![]() |
#3378 | |
diyAudio Member
Join Date: Oct 2006
Location: San Diego
|
Quote:
Above 10khz, the BMS leaves the B&C in the dust, and gives the Tad a run for it's money. Of course, below 2000hz, the B&C and the TAD eat the BMS alive, and below 2000hz is very important. So it's a tradeoff of course. The BMS 4540ND has a delicacy and "airiness" in the top octave which reminds me of a ribbon tweeter. This is a measurement that Brandon (augerpro) did of a B&C on an OS waveguide. You can see there's a peak at 16hz, which is the domes breakup, and then the output drops off a cliff. ![]() My measurements of a BMS 4540ND on an OS waveguide. This is from my car. So the response is a lot more ragged than you'd get in an anechoic measurement. Nonetheless, there's no peak at all, and response continues beyond 20khz. If the peak is there, it's above 20khz. ![]() TimG at audio heritage did this measurement of a 4540ND on an ENG1-90 waveguide, which is clearly inspired by an OS waveguide. Same results : extension beyond 20khz. |
|
![]() |
![]() |
#3379 |
diyAudio Member
Join Date: Mar 2005
Location: Taiwan
|
I've recently been running some sims on larger configurations. They get very CD without the on axis dip. I will show measurement data when the time is right. But I already have a pretty good feeling what is causing the on-axis dip in your designs.
__________________
Hear the real thing! |
![]() |
![]() |
#3380 | |
diyAudio Member
Join Date: Dec 2004
Location: Novi, Michigan
|
Quote:
We've been all through this before, where have you been?
__________________
Earl Geddes Gedlee Website |
|
![]() |
![]() |
Thread Tools | Search this Thread |
|
|
New To Site? | Need Help? |