Xover gurus help plz. :(

r0lf- · 5th September 2004, 10:23 PM

Welp, I built my Truine. It sounds like poop though.

I went with the vented box design instead of sealed and with the xover that was supplied this results in incredibly boomy voices and other not so fun stuff.

http://www.partsexpress.com/projects...ne/triune.html

Heres the specs for the Xover and box specs.

Can anyone help me tweak the xover or point me in the right direction? I know this speaker has incredible potential for a vented setup. I dont really wanna rip up the box and make it sealed.

Thanks!

Ron E · 6th September 2004, 12:52 AM

The choice between sealed and ported should not require you to change the crossover. Make sure you have everything hooked up properly and if you still don't like the sound you can lengthen the ports or seal the box....

Ports that are too short or a box that is too small will make tubby bass by raising the tuning frequency. Lowering the tuning frequency by lengthening the ports will reduce tubbiness, even in a properly made design.

Jonathan Bright · 6th September 2004, 12:54 AM

My first reaction is that it is not the cross-over. There would be other places to start looking into. (A) placement is one: as you put a speaker near a reflective surface you get a 3db increace (for each plane) so corner mounting will seriously increace bass (booming) if your not careful. (B) What did you have before? It may have been v.bass deficient and now you have a more true bass. Generally male voice can be a good guide so if you can test your sysytem on a voice you are familar with you will get a reasonable estimation. Now if you can't get the speaker out of a corner for practical reason then you could lower the bass tone control if you have one. Make sure the electrical impedence of the
speaker leads is as low as possible. That means good joints and short leads. That will aid the electrical damping. If that does no good you could tack a piece of fiborous material around the back of the bass driver. This will increase the acoustical damping. More material more damping. Do one speaker first and test the results. It is just possible that the recording you are listening to is not properly mastered. Try another record/CD/tape.

bogoes · 6th September 2004, 12:56 AM

Post this question on the PE Forum, the designer resides there as do many people who have built the Triune. I'm sure someone there can help you out.

http://www.pesupport.com/cgi-bin/config.pl

Good Luck.

r0lf- · 6th September 2004, 01:19 AM

Thanks for the replys guys. You think more dampning would help out? I could try that. I could take a pic of the way its setup. Its on a shelf/stand in about the middle. Its close to a wall in the rear, but not in a corner. I have my recievers/DVD players on the bottom of the stand, then the center pointing slightly upwards towards the sweetspot/listening position. Then the TV on the top of the stand.

What would stuffing or whatnot do? would it help?

jackinnj · 6th September 2004, 04:01 AM

Quote:

Originally posted by r0lf-
What would stuffing or whatnot do? would it help?

Stuffing the enclosure with polyester batting increases the effective volume of the enclosure.

Ron E · 6th September 2004, 05:55 PM

Quote:

Originally posted by jackinnj

Stuffing the enclosure with polyester batting increases the effective volume of the enclosure.

Stuffing a vented box will reduce the bass.

Bose(o) · 6th September 2004, 06:08 PM

Yeah, it will kill off any bumps in the response...making the Qtc of the enclosure lower.

r0lf- · 6th September 2004, 06:51 PM

Welp guys. Now this thing actually sounds damned smooth! I had a kinda shoddy connection to the tweeter, so I fixed that, so that sucker picked right up. Stuffed each side to smooth out the boomyness and im really starting to like the way its sounding. The tweeter isnt as crisp as Id like, but it was also pretty cheap and sounds really smooth and natural. I guess I just like a little bit of brightness and crispness to my tweeters.

Sounds great for a center though, very smooth. Thanks for the help!

Bose(o) · 6th September 2004, 08:25 PM

I'm glad you're enjoying it now! That's the way this stuff is supposed to be! I guess you've learned another thing when building your speakers though and that's the key to building your speakers--the learning process.

For extra crispiness you can try Pringles--"Once you pop the fun don't stop."

5th September 2004, 10:23 PM	#1
r0lf- diyAudio Member Join Date: May 2004 Location: California	Xover gurus help plz. :( Welp, I built my Truine. It sounds like poop though. I went with the vented box design instead of sealed and with the xover that was supplied this results in incredibly boomy voices and other not so fun stuff. http://www.partsexpress.com/projects...ne/triune.html Heres the specs for the Xover and box specs. Can anyone help me tweak the xover or point me in the right direction? I know this speaker has incredible potential for a vented setup. I dont really wanna rip up the box and make it sealed. Thanks!

6th September 2004, 12:52 AM	#2
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	The choice between sealed and ported should not require you to change the crossover. Make sure you have everything hooked up properly and if you still don't like the sound you can lengthen the ports or seal the box.... Ports that are too short or a box that is too small will make tubby bass by raising the tuning frequency. Lowering the tuning frequency by lengthening the ports will reduce tubbiness, even in a properly made design. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

6th September 2004, 12:54 AM	#3
Jonathan Bright diyAudio Member Join Date: Feb 2004 Location: Queensland	My first reaction is that it is not the cross-over. There would be other places to start looking into. (A) placement is one: as you put a speaker near a reflective surface you get a 3db increace (for each plane) so corner mounting will seriously increace bass (booming) if your not careful. (B) What did you have before? It may have been v.bass deficient and now you have a more true bass. Generally male voice can be a good guide so if you can test your sysytem on a voice you are familar with you will get a reasonable estimation. Now if you can't get the speaker out of a corner for practical reason then you could lower the bass tone control if you have one. Make sure the electrical impedence of the speaker leads is as low as possible. That means good joints and short leads. That will aid the electrical damping. If that does no good you could tack a piece of fiborous material around the back of the bass driver. This will increase the acoustical damping. More material more damping. Do one speaker first and test the results. It is just possible that the recording you are listening to is not properly mastered. Try another record/CD/tape. __________________ "It was the Spring time of the year when aunt calls to aunt like mastodons across the frozen waste." P.G. Wodehouse.

6th September 2004, 12:56 AM	#4
bogoes diyAudio Member Join Date: Jun 2004 Location: Tallahassee	Post this question on the PE Forum, the designer resides there as do many people who have built the Triune. I'm sure someone there can help you out. http://www.pesupport.com/cgi-bin/config.pl Good Luck. __________________ - Chris

6th September 2004, 06:08 PM	#8
Bose(o) diyAudio Member Join Date: Dec 2001 Location: Ottawa, Ontario, Canada	Yeah, it will kill off any bumps in the response...making the Qtc of the enclosure lower. __________________ ERTW 4 life! "the day has 24hours. If that is not enough take the night."-Roemhild


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6th September 2004, 01:19 AM	#5
r0lf- diyAudio Member Join Date: May 2004 Location: California	Thanks for the replys guys. You think more dampning would help out? I could try that. I could take a pic of the way its setup. Its on a shelf/stand in about the middle. Its close to a wall in the rear, but not in a corner. I have my recievers/DVD players on the bottom of the stand, then the center pointing slightly upwards towards the sweetspot/listening position. Then the TV on the top of the stand. What would stuffing or whatnot do? would it help?

6th September 2004, 06:51 PM	#9
r0lf- diyAudio Member Join Date: May 2004 Location: California	Welp guys. Now this thing actually sounds damned smooth! I had a kinda shoddy connection to the tweeter, so I fixed that, so that sucker picked right up. Stuffed each side to smooth out the boomyness and im really starting to like the way its sounding. The tweeter isnt as crisp as Id like, but it was also pretty cheap and sounds really smooth and natural. I guess I just like a little bit of brightness and crispness to my tweeters. Sounds great for a center though, very smooth. Thanks for the help!

6th September 2004, 08:25 PM	#10
Bose(o) diyAudio Member Join Date: Dec 2001 Location: Ottawa, Ontario, Canada	I'm glad you're enjoying it now! That's the way this stuff is supposed to be! I guess you've learned another thing when building your speakers though and that's the key to building your speakers--the learning process. For extra crispiness you can try Pringles--"Once you pop the fun don't stop." __________________ ERTW 4 life! "the day has 24hours. If that is not enough take the night."-Roemhild

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