For some 'real world' info , at present I'm using b&w dm602's with my bass units, xo@ 90Hz via my AV receiver. The amp used is a cyrus 1 (30 wpc) and the sensitivity is 90Db (the speaker does drop to 4.3ohms though..)
This goes plenty loud enough, and to my ears sounds pretty 'clean' (compared to the 602's running full range) - it can go way louder than I listen to aswell, so maybe I don't listen 'loud' afterall😀
30w = 105Db@32W
If the amp isn't clipping , and I'm pretty sure it isn't, then thats plenty loud enough for me..I'm using audiolab 8000a's for the bass units, and will swap them around when I get these built.
The Linkwitz site has a table where he shows how different Q filters are combined wrt various slopes, to achieve the 0.49 Q.
http://www.linkwitzlab.com/filters.htm#8
Looks like a Q of 1.0 added to my acoustic 0.5 is an OK way to go..
Cheers
Rob
This goes plenty loud enough, and to my ears sounds pretty 'clean' (compared to the 602's running full range) - it can go way louder than I listen to aswell, so maybe I don't listen 'loud' afterall😀
30w = 105Db@32W
If the amp isn't clipping , and I'm pretty sure it isn't, then thats plenty loud enough for me..I'm using audiolab 8000a's for the bass units, and will swap them around when I get these built.
The Linkwitz site has a table where he shows how different Q filters are combined wrt various slopes, to achieve the 0.49 Q.
http://www.linkwitzlab.com/filters.htm#8
Looks like a Q of 1.0 added to my acoustic 0.5 is an OK way to go..
Cheers
Rob
RobWells said:
I really don't want to add to your difficulties but feel I ought to
refer you to the original seminal article on Linkwitz / Riley c/o's.
http://www.linkwitzlab.com/sb80-3wy.htm#part 2
Specifically to take note of the electrical delay used for the bass/
mid c/o overpoint.
The famous exponent of the passive 4th order L/R was the KEF 105, this used offset drivers.
🙂 sreten.
Attachments
Hi Sreten,
I posted Q's about the time alignment way back :
http://www.diyaudio.com/forums/showthread.php?s=&threadid=6030&highlight=
And I've posted on other peoples threads about these issues.
What I've decided is :
The difference between the mid and the bass units is easily compensated by moving the mid/tweet cab back slightly on the bass unit - have you seen my bass cabs ? - they're here :
http://www.diyaudio.com/forums/showthread.php?s=&threadid=6030&highlight=
Page 7 of that thread poses some serious similarities to the kefs..
I've e-mailed John Pomann about a kit for my x/o, and asked about delay circuits for the tweeter. I've got a digital delay here, so can play with the delay and see if it affects response the way the textbooks say, or whether I can ignore it - the digital delay, with my spectrum analyser should give me the right ms delay anyhow. I'm guessing you don't know I've been working on this project for over a year😀
Cheers
Rob
I posted Q's about the time alignment way back :
http://www.diyaudio.com/forums/showthread.php?s=&threadid=6030&highlight=
And I've posted on other peoples threads about these issues.
What I've decided is :
The difference between the mid and the bass units is easily compensated by moving the mid/tweet cab back slightly on the bass unit - have you seen my bass cabs ? - they're here :
http://www.diyaudio.com/forums/showthread.php?s=&threadid=6030&highlight=
Page 7 of that thread poses some serious similarities to the kefs..
I've e-mailed John Pomann about a kit for my x/o, and asked about delay circuits for the tweeter. I've got a digital delay here, so can play with the delay and see if it affects response the way the textbooks say, or whether I can ignore it - the digital delay, with my spectrum analyser should give me the right ms delay anyhow. I'm guessing you don't know I've been working on this project for over a year😀
Cheers
Rob
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