Some simple (for most, not me though) x-over questions - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Old 29th December 2002, 06:19 PM   #1
diyAudio Member
Jimmy154's Avatar
Join Date: Jun 2002
Location: NH, USA
Default Some simple (for most, not me though) x-over questions

I have a few more questions.

I'm going to copy alvaius and go with the cross-over point at 2.3 KHz cause he knows better than me what it should be. And the lower woofer will be LP at 6 db/octive at 400 Hz coppying alvaius. I will use the R/C combination Wombat gave me at 5.1 ohms and .68 or .73 uF cap. Where or how can I find out the exact value? Any body every hear of this kind of filter?

When I got the values for my x-over I use the impedances at the x-over frequencies, right? Not the nominal impedances. 7.09 ohms for tweeter and 13.6 ohms for woofer at 2.3 KHz. And for bottom woofer at 400 Hz it's around 7 ohms I would say. Do I need a zobel network for the bottom woofer? Impedance was taken by alvaius at this thread forums/show...highlight=zetag

As you might have guessed I plan to compensate for the baffle step with the bottom woofer. The baffle is 11" (27.5 cm) wide, with the corners angle cut I think it will be like 10" (25 cm). So I think the baffle step will be like 500 Hz (don't know exactly yet, any one know a good website for baffle step). My question is how many db down should the bottom woofer be at 500 Hz? I was thinking the bottom woofer should be at least 3 db down at 500 hz.

Also I have a bunch of 18 gauge inductors that I might use is it bad to use these for sound quality or is it okay as long as I factor in the resistance of these inductors into my calculations?

And I'm not going with resistors for the tweeter cause the woofer and the tweeter are both around 91 db sensativity. Is this a good idea? Do I need resistors or attenuation circuit?

Does anybody know how to measure the impedance of resistors? I used an ohms/volt meter, but I got an impedance of infinfity. Does it have to have power running threw it when you measure the impedance?

Does it matter that the top and bottom woofer are now in the same sealed (with T-shirts in port) enclosure? If playing top woofer frequencies (above 500 Hz only) and lower woofer isn't moving the top woofer will act like it's in free air, I think. 1 - woofers VAS is 42.22 liters and the box is 47 liters. This is going to be bad right? What should I do about this? Try to make the top woofer sealed (might be to late though)?

As you can see I don't know exactly what I'm doing, so any help is appreciated.
Try ----> gtlucko (4T) gmale
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Simple Simple SE questions nodiak Tubelab 57 2nd February 2010 11:02 PM
Three Simple Questions!! Rob11966 Tubes / Valves 7 9th November 2007 10:17 AM
Simple questions. Help Please JustinSanders15 Multi-Way 2 12th May 2007 02:48 AM
simple pre questions graeme uk Solid State 0 20th May 2006 12:36 PM
Which DIY DAC simple questions??? jvsb Digital Source 0 3rd November 2003 03:21 PM

New To Site? Need Help?

All times are GMT. The time now is 10:12 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2