Unsatisfactory treble in my new 3 way project?

SamClassA · 25th November 2006, 03:32 AM

Hi, Just finished building my 3 way speakers. The bass and midrange sound great, but the treble is a bit laid back. It could be a bit brighter. I added a L-Pad to the tweeters to drop the efficiency to match the Midrange. Do you think this might be the problem?

Salas · 25th November 2006, 04:19 AM

Shunt a 5,6 uf cap over the series Lpad resistor and tell us if you are content with the HF.

tinitus · 25th November 2006, 04:43 AM

Might be a number of things

Would help with a schematic of crossover and information of drivers, eventually a picture of speaker

SamClassA · 25th November 2006, 05:06 AM

Xover

tinitus · 25th November 2006, 05:15 AM

I am quite sure its phase related

First you should reverse polarity on midrange

If thats not enough you should adjust capacitor on tweeter, which I am sure is too big

SamClassA · 25th November 2006, 05:33 AM

pic

SamClassA · 25th November 2006, 05:35 AM

speakers

Hezz · 25th November 2006, 05:47 AM

Adjusting the L-pad will change the crossover freqency of the tweeter.

But it's best to adjust the L-pad balance by ear to get the tweeter energy in balance with the other drivers. You probably just added a couple of extra ohms resistance to the tweeter circuit. So you have reduced it's efficiency and possibly changed the crossover frequency quite a bit.

You were at about 3-4 ohms before the L-pad. After the L-pad you are probably at around 6 ohms or so (guess).

Try a smaller resistor value for the resistor in series. Of course it will change the crossover frequency a little but you've got to get the tweeter level set properly first. Then you can recalculate the cap value.

Once you get the general balance set you can adjust the capacitor value taking into consideration the new resistance value.

Work back and forth between optimizing the tweeter sound level with the L-pad and then recalulating the cap for the correct crossover frequency.

After a couple of iterations you will have a good sounding blend that you like.

25th November 2006, 03:32 AM	#1
SamClassA diyAudio Member Join Date: Jul 2006	Unsatisfactory treble in my new 3 way project? Hi, Just finished building my 3 way speakers. The bass and midrange sound great, but the treble is a bit laid back. It could be a bit brighter. I added a L-Pad to the tweeters to drop the efficiency to match the Midrange. Do you think this might be the problem?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
help treble	tadiam	Chip Amps	4	26th August 2007 10:44 PM
No bass / No Treble But Bass And treble Help!	jleaman	Analog Line Level	11	29th October 2005 06:45 AM
Best Treble Unit?	ShinOBIWAN	Multi-Way	187	2nd May 2004 08:45 PM
Treble Control	palesha	Solid State	5	30th April 2003 04:04 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

25th November 2006, 04:19 AM	#2
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Shunt a 5,6 uf cap over the series Lpad resistor and tell us if you are content with the HF.

25th November 2006, 04:43 AM	#3
tinitus diyAudio Moderator Join Date: Nov 2005	Might be a number of things Would help with a schematic of crossover and information of drivers, eventually a picture of speaker

25th November 2006, 05:15 AM	#5
tinitus diyAudio Moderator Join Date: Nov 2005	I am quite sure its phase related First you should reverse polarity on midrange If thats not enough you should adjust capacitor on tweeter, which I am sure is too big

25th November 2006, 05:47 AM	#8
Hezz diyAudio Member Join Date: Dec 2002 Location: Utah	Adjusting the L-pad will change the crossover freqency of the tweeter. But it's best to adjust the L-pad balance by ear to get the tweeter energy in balance with the other drivers. You probably just added a couple of extra ohms resistance to the tweeter circuit. So you have reduced it's efficiency and possibly changed the crossover frequency quite a bit. You were at about 3-4 ohms before the L-pad. After the L-pad you are probably at around 6 ohms or so (guess). Try a smaller resistor value for the resistor in series. Of course it will change the crossover frequency a little but you've got to get the tweeter level set properly first. Then you can recalculate the cap value. Once you get the general balance set you can adjust the capacitor value taking into consideration the new resistance value. Work back and forth between optimizing the tweeter sound level with the L-pad and then recalulating the cap for the correct crossover frequency. After a couple of iterations you will have a good sounding blend that you like.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)