|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
99.177.134.118
In Reply to: RE: Can a simple crossover (cap/inductor) achieve time alignment without a stepped baffle? posted by jupiterboy on July 20, 2014 at 09:28:48
Tom
Alignment requires the LF and HF signals arrive at the same time. The easiest way to get this is to off set the drivers in the baffle board.
If you are using an Altec 604 or 605, the drivers are fixed . So you need to time delay the Lf signals in the XO.
See my web site
www.donpatten@mac.com
Don
Follow Ups:
Or is the crossover on the tweeters in the Altec coaxials steeper and thus the output of the tweeter more delayed than that produced by the woofers?I am planning a WMW 2-way using two larger spherical enclosures for bass and one smaller sphere with a Manger (M) driver.
Leaving aside the stand issues. IF I am using 1st order Passive Line Level filters - (and any R/C/L on each driver at the 150Hz transition) -
the WR centre sphere's Manger driver's centre will need to be further back than the 'VC centre' of the two bass spheres?Correct?
Also! IF I do use 1st order filters, what is the maximum driver offset I can have at 150Hz? I know there's a rule of thumb - which depends on filter order and lambda but I am not sure what it is. IIRC it is a 1/4 of a wave-length for 1st order filters. It might be a whole lot less!?
If I can get the two bass-driver centres a lot closer than what is required, do those two distances - from the main WR driver - still need to be almost exactly the same?
But, if I go with 3rd-order line-level filters, most of these issues become less critical, yes?
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 07/23/14
Timbo
The XO delay is caused by the coils in the woofer path. More "L" more delay. Since a higher order filter has more L , the higher order filter has more delay.
Use the test signal on my web site;
slide the drivers fore & aft to tune the delay.
You will need a scope to tell when the delay is correct.
www.donpatten.com
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: