First speaker design - please comment - Page 2

sobazz · 13th May 2003, 12:32 PM

Thanks Ron E. The excursion issue is much clearer to me know. But I'll stick to the latter project due to several uncertainties.

It seems to me that a project using high end components is a bit overkill for a first timer.

sobazz · 13th May 2003, 02:10 PM

How precise must the netto volume vs. tuning freq. be? I've ended up having approx. 0,4L (14%) more netto volume than planned.

I've read a couple of articles about crossover networks, but for this first time project I would prefer to use a properly tested design.

Can I use this design?

If yes, what should the value of the resistor in series with the tweeter be?

The Vifa midwoofer has a sensivity of 85db, the tweeter 90db.

navin · 14th May 2003, 05:15 AM

this is andy G's territory. but i guess you'd need more than 4 ohms to level the HF.

remember the XO sees the resistor so yo have to change teh values of teh L to keep the same XO freq.

sobazz · 16th May 2003, 07:03 PM

Hmm... thanks. But to what value? And what is the XO freq. of this circuit?

navin · 17th May 2003, 06:57 AM

andy G where art thou?

Piersma · 17th May 2003, 08:19 AM

Speaker builders,

I have currently used the LC cross over to upgrade a commercial
DynAudio MK2 speaker. The drivers used in this cabinet were the 17W75 woofer and the D-28AF tweeter.
The speaker gained al lot with this new cross over, the overall sound is more open and airy.
I changed the series resistor for the AF tweeters to 3.3 Ohm without noticing any difference in the sound of the speaker.
I have exprimented with several values from 2.2 tot 3.9 Ohm.
With 2.2 Ohms the tweeter was to bright.

I would recommend to experiment with the LC cross over you will find the proper value for R1.

Regards
Piersma

sobazz · 17th May 2003, 04:51 PM

Please forgive me.... I can't stop asking questions.

What should the value of the other resistor be, then?

Piersma · 17th May 2003, 05:56 PM

I left it 2.2 Ohms this resistor its value not extremely sensitive.

Salas · 17th May 2003, 07:49 PM

I have posted a thread today about a speaker using a Morel and an Audax 8 inch. I took long to tune and it is proven. I think it suits your caution for building a not so expensive two way.
You may give it a shot.

If a couple of Morel tweeters are lying around...

navin · 19th May 2003, 10:23 AM

the resistor in the center has little acoustic consequence it is to prevent the impedance to dip too low in the range of freqs. handled by both drivers.

14th May 2003, 05:15 AM	#13
navin diyAudio Member Join Date: Jan 2002 Location: Mumbai (Bombay), India	this is andy G's territory. but i guess you'd need more than 4 ohms to level the HF. remember the XO sees the resistor so yo have to change teh values of teh L to keep the same XO freq. __________________ ...still looking for the holy grail.

17th May 2003, 06:57 AM	#15
navin diyAudio Member Join Date: Jan 2002 Location: Mumbai (Bombay), India	andy G where art thou? __________________ ...still looking for the holy grail.

17th May 2003, 08:19 AM	#16
Piersma diyAudio Member Join Date: Jan 2003 Location: Netherlands	Cross over Speaker builders, I have currently used the LC cross over to upgrade a commercial DynAudio MK2 speaker. The drivers used in this cabinet were the 17W75 woofer and the D-28AF tweeter. The speaker gained al lot with this new cross over, the overall sound is more open and airy. I changed the series resistor for the AF tweeters to 3.3 Ohm without noticing any difference in the sound of the speaker. I have exprimented with several values from 2.2 tot 3.9 Ohm. With 2.2 Ohms the tweeter was to bright. I would recommend to experiment with the LC cross over you will find the proper value for R1. Regards Piersma

17th May 2003, 05:56 PM	#18
Piersma diyAudio Member Join Date: Jan 2003 Location: Netherlands	Cross over I left it 2.2 Ohms this resistor its value not extremely sensitive.

17th May 2003, 07:49 PM	#19
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Have a look at my design I have posted a thread today about a speaker using a Morel and an Audax 8 inch. I took long to tune and it is proven. I think it suits your caution for building a not so expensive two way. You may give it a shot. If a couple of Morel tweeters are lying around...


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13th May 2003, 12:32 PM	#11
sobazz diyAudio Member Join Date: Apr 2003 Location: Jutland	Thanks Ron E. The excursion issue is much clearer to me know. But I'll stick to the latter project due to several uncertainties. It seems to me that a project using high end components is a bit overkill for a first timer.

13th May 2003, 02:10 PM	#12
sobazz diyAudio Member Join Date: Apr 2003 Location: Jutland	How precise must the netto volume vs. tuning freq. be? I've ended up having approx. 0,4L (14%) more netto volume than planned. I've read a couple of articles about crossover networks, but for this first time project I would prefer to use a properly tested design. Can I use this design? If yes, what should the value of the resistor in series with the tweeter be? The Vifa midwoofer has a sensivity of 85db, the tweeter 90db.

16th May 2003, 07:03 PM	#14
sobazz diyAudio Member Join Date: Apr 2003 Location: Jutland	Hmm... thanks. But to what value? And what is the XO freq. of this circuit?

17th May 2003, 04:51 PM	#17
sobazz diyAudio Member Join Date: Apr 2003 Location: Jutland	Please forgive me.... I can't stop asking questions. What should the value of the other resistor be, then?

19th May 2003, 10:23 AM	#20
navin diyAudio Member Join Date: Jan 2002 Location: Mumbai (Bombay), India	the resistor in the center has little acoustic consequence it is to prevent the impedance to dip too low in the range of freqs. handled by both drivers. __________________ ...still looking for the holy grail.

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