New 3way build, I need sugestions

kzeprf22 · 12th February 2010, 08:00 AM

Hi to all,

I' have build the speaker that described from the attached corssover diagram. I also include the simulated frequency responce of the speaker elements, red is the emminence horn, purple is the tweeter and blue is the woofer. The fact is that I am not really satisfied from the result. The wooffer is in one 110 liter bass reflex enclosure from plywood. Can someone suggest any change?
Thanks

jerome69 · 12th February 2010, 09:05 AM

Hi,

There is a lot of thing to say. A photo of the loudspeaker can give a better idea of the system. You should say what is wrong ? give us the expected crossover frequency ?

But I can say :

1. The box volume seems good. You must precisely tune the BR frequency with the good surface vent.

2. The tweeter DSM 25 FFL doesn't match with the level of the other speaker :
15" 98dB 2" 115dB 1" 90dB
You should not use this tweeter, better you should use an APT80 or APT150 or other with 100dB sensitivity

3. You crossover seems not to be enough good. The crossover frequency is very delicate to choose. The 15" should not be used after 700Hz because of the resonance peak at 1kHz, the 2" below 600Hz . I suggest 700Hz. And the tweeter can cross the 2" at 4kHz

4. 700Hz and 4kHz, you can make a crossover. I can't make suggestion on the crossover because, it could take a lot of time to design, I haven't. You should not have measurement tools, you can use spltools see Jay and rjb website.
I strongly suggest to do measurement. You will see better what you are doing.

Have fun.

kzeprf22 · 12th February 2010, 09:25 AM

Thanx a lot Jerome69. I wiil try to post pictures on the afternoon (for me). The desired cross points is about 800 Hz ant 7000 Hz.

jerome69 · 12th February 2010, 09:55 AM

7000Hz seems a little high for the PSD3006 2" because you have a dip at 4.5khz and the 2" begins to beam at 7kHz.

kzeprf22 · 12th February 2010, 10:36 AM

Quote:

Originally Posted by jerome69

7000Hz seems a little high for the PSD3006 2" because you have a dip at 4.5khz and the 2" begins to beam at 7kHz.

Yes I noticed also this dip but I thought that it was not important at 5k from 114db to 110. Anyway I wiil try cross the tweeter to 4k and as you noticed in the diagramm i reduced the sensitivity of the pds3006 using a l-pad. I will post results As soon I will do that.

kzeprf22 · 13th February 2010, 10:31 AM

Here is the photos. The cross points now are 700Hz and 4kHz but no significant improvement. Th 15" now has les mids, but maybe I have to change the the tweeters . I will buy the beyma CP12. ANY OPINIONS ARE WELCOME
THNX

kzeprf22 · 13th February 2010, 10:48 AM

Just to add that the bass reflex tube is behind with 15cm diameter

Loren42 · 13th February 2010, 12:06 PM

I did not see the polarities for the speakers noted on the crossover schematic.

Tweeter should be mounted closer to the horn.

You might also try placing the speakers on stands to get away from the floor.

Do you have frequency sweep plots?

kzeprf22 · 13th February 2010, 06:12 PM

Quote:

Originally Posted by Loren42

I did not see the polarities for the speakers noted on the crossover schematic.

Tweeter should be mounted closer to the horn.

You might also try placing the speakers on stands to get away from the floor.

Do you have frequency sweep plots?

I attach the polarities. Thnx

jerome69 · 13th February 2010, 09:34 PM

I think this crossover should work better. The crossover frequency are near 800Hz and 4kHz. The LC on the boomer is to minimize the 1.2kHz peak. The polarity is positive for the 15" and the 1" but negative for the 2".
You should find the correct level for the 2" and the 1" with LPADs.

Hope this helps.

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
The "Feils" ...A rookie LCR 3way build	smokinghot	Multi-Way	34	5th February 2010 04:06 AM
Sugestions for bookshelf speakers to build with my new tube amp	Guytute	Multi-Way	5	30th December 2008 06:55 PM
First Build (3way)	Baronty	Multi-Way	6	14th October 2004 09:20 PM
sugestions	JayV	Solid State	0	18th November 2003 09:17 PM
Tweeter sugestions	dkelly60	Multi-Way	8	29th July 2003 03:51 PM

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

12th February 2010, 09:05 AM	#2
jerome69 diyAudio Member Join Date: Feb 2008 Location: Lyon	Hi, There is a lot of thing to say. A photo of the loudspeaker can give a better idea of the system. You should say what is wrong ? give us the expected crossover frequency ? But I can say : 1. The box volume seems good. You must precisely tune the BR frequency with the good surface vent. 2. The tweeter DSM 25 FFL doesn't match with the level of the other speaker : 15" 98dB 2" 115dB 1" 90dB You should not use this tweeter, better you should use an APT80 or APT150 or other with 100dB sensitivity 3. You crossover seems not to be enough good. The crossover frequency is very delicate to choose. The 15" should not be used after 700Hz because of the resonance peak at 1kHz, the 2" below 600Hz . I suggest 700Hz. And the tweeter can cross the 2" at 4kHz 4. 700Hz and 4kHz, you can make a crossover. I can't make suggestion on the crossover because, it could take a lot of time to design, I haven't. You should not have measurement tools, you can use spltools see Jay and rjb website. I strongly suggest to do measurement. You will see better what you are doing. Have fun.

12th February 2010, 09:25 AM	#3
kzeprf22 diyAudio Member Join Date: Apr 2007	Thanx a lot Jerome69. I wiil try to post pictures on the afternoon (for me). The desired cross points is about 800 Hz ant 7000 Hz.

12th February 2010, 09:55 AM	#4
jerome69 diyAudio Member Join Date: Feb 2008 Location: Lyon	7000Hz seems a little high for the PSD3006 2" because you have a dip at 4.5khz and the 2" begins to beam at 7kHz.

13th February 2010, 10:48 AM	#7
kzeprf22 diyAudio Member Join Date: Apr 2007	Just to add that the bass reflex tube is behind with 15cm diameter

13th February 2010, 12:06 PM	#8
Loren42 diyAudio Member Join Date: Sep 2008 Location: "Space Coast" Florida, USA	I did not see the polarities for the speakers noted on the crossover schematic. Tweeter should be mounted closer to the horn. You might also try placing the speakers on stands to get away from the floor. Do you have frequency sweep plots?

13th February 2010, 09:34 PM	#10
jerome69 diyAudio Member Join Date: Feb 2008 Location: Lyon	I think this crossover should work better. The crossover frequency are near 800Hz and 4kHz. The LC on the boomer is to minimize the 1.2kHz peak. The polarity is positive for the 15" and the 1" but negative for the 2". You should find the correct level for the 2" and the 1" with LPADs. Hope this helps.

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