Will this Crossover work? - Page 5

gfiandy · 4th March 2011, 06:44 PM

Whilst I agree this is not the ideal driver for the application its what he has. If I have understood what you consider to be the problem correctly, I don't think it makes the driver unusable.

The power limitation is not that bad with a 250W amplifer (the max the sub is specified for) you have 104dB available down to about 20 Hz and in the important 50 to 100Hz region where most of the energy is you have 110dB that is sufficient for most rooms.

See attached sim, which show the SPL excursion limited at 12mm for the driver. The driver will probably have a much higher excursion than this with distortion so it is unlikley that this is the real SPL limit.

Regards,
Andrew

farmerjack61 · 6th March 2011, 02:47 AM

Hello Allan and Arty. You are probably right. (these speakers seem to be pretty average), I didn't really do any homework for this project. The subs are pretty inefficient according to all sources. This is the first Jaycar speaker that I have purchased that has not exceeded expectations, in fact I still haven't given it a chance!

I plan to make a couple of powered subs from these speakers. I will use them in my system and I am sure I can manage to blend them into the mix with at least a little improvement to the overall sound.

I have never regarded the venom speaker as a work of art - although they do have a durable construction if you look at it from a 'mechanical' point of view.

This is now just a project to help me expand my understanding of this topic & hope the result is not quite as bad as the (growing!) opinion would suggest. I must declare that I believe in miracles - so anything could happen!.

At the moment, if I were just about to do it all again I might get a paper cone 12" from Alltronics which has a lot better parameters to work with. It would cost about $80, have a SPL of 90 or thereabouts and f0 of 25Hz. It's mechanical 'action' would be firm but not stiff as the venom. These are just a few of the things I have discovered over the past few weeks. So this 'car subbie' has already paid for itself - with the knowledge it has given me, who knows where this road may lead.

Once again, it is good to say hello and I hope to hear from you all in the near future.

Cheers.

farmerjack61 · 6th March 2011, 03:00 AM

I just looked at Andy's plots, I didn't fully understand them, but the sealed boxes seem to be more predictable and less changable or they have a more linear response between 0 and 50Hz.

If I simply choose the sealed 140 litre design, jam a sock into the vent, and crank the main speakers back by 6db then I should have a real cracker! No?

AllenB · 6th March 2011, 03:04 AM

My comments about boot loading and inefficiency have nothing to do with sound quality. These things are a design choice...just one of the many standard compromises. What they mean for the average home hifi enthusiast are two things. A large box, and a high power requirement.

farmerjack61 · 6th March 2011, 03:47 AM

Hi Allen, I really cracked up when I saw the link you posted, it mentioned the Magna and the Venom in one line.........hmmm I drive a magna. I think the planets have aligned! and soon I'll be on the mother-ship. Time for a beer. Talk soon. Thick scull but some stuff is slowly getting through! Cheers and salutations from Tassie.

View Poll Results: Is farmerjack a loonie?
No, he just needs some help.	5	83.33%
No, but his jokes really stink.	1	16.67%
No, but he is dangerous with a soldering iron.	0	0%
Yes.	0	0%
Multiple Choice Poll. Voters: 6. You may not vote on this poll

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
anyone here work up a good crossover for new Beta 10CX?	freddi	Multi-Way	4	9th January 2010 04:41 PM
Can this crossover work in my speakers ?	kyu	Multi-Way	5	5th September 2008 10:28 AM
Tried assembling my own crossover...why didn't it work?	PoorSound	Multi-Way	5	16th February 2008 07:02 PM
Tweets don't work on my new crossover!	lemans23	Multi-Way	23	28th February 2007 02:38 AM
have a speaker design- need crossover- will this work?	trespasser_guy	Multi-Way	1	26th August 2002 05:23 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

6th March 2011, 02:47 AM	#42
farmerjack61 diyAudio Member Join Date: Nov 2010 Location: Devonport, Tasmania	Hello Allan and Arty. You are probably right. (these speakers seem to be pretty average), I didn't really do any homework for this project. The subs are pretty inefficient according to all sources. This is the first Jaycar speaker that I have purchased that has not exceeded expectations, in fact I still haven't given it a chance! I plan to make a couple of powered subs from these speakers. I will use them in my system and I am sure I can manage to blend them into the mix with at least a little improvement to the overall sound. I have never regarded the venom speaker as a work of art - although they do have a durable construction if you look at it from a 'mechanical' point of view. This is now just a project to help me expand my understanding of this topic & hope the result is not quite as bad as the (growing!) opinion would suggest. I must declare that I believe in miracles - so anything could happen!. At the moment, if I were just about to do it all again I might get a paper cone 12" from Alltronics which has a lot better parameters to work with. It would cost about $80, have a SPL of 90 or thereabouts and f0 of 25Hz. It's mechanical 'action' would be firm but not stiff as the venom. These are just a few of the things I have discovered over the past few weeks. So this 'car subbie' has already paid for itself - with the knowledge it has given me, who knows where this road may lead. Once again, it is good to say hello and I hope to hear from you all in the near future. Cheers.

6th March 2011, 03:00 AM	#43
farmerjack61 diyAudio Member Join Date: Nov 2010 Location: Devonport, Tasmania	I just looked at Andy's plots, I didn't fully understand them, but the sealed boxes seem to be more predictable and less changable or they have a more linear response between 0 and 50Hz. If I simply choose the sealed 140 litre design, jam a sock into the vent, and crank the main speakers back by 6db then I should have a real cracker! No?

6th March 2011, 03:04 AM	#44
AllenB diyAudio Member Join Date: Oct 2008	My comments about boot loading and inefficiency have nothing to do with sound quality. These things are a design choice...just one of the many standard compromises. What they mean for the average home hifi enthusiast are two things. A large box, and a high power requirement.

6th March 2011, 03:47 AM	#45
farmerjack61 diyAudio Member Join Date: Nov 2010 Location: Devonport, Tasmania	Hi Allen, I really cracked up when I saw the link you posted, it mentioned the Magna and the Venom in one line.........hmmm I drive a magna. I think the planets have aligned! and soon I'll be on the mother-ship. Time for a beer. Talk soon. Thick scull but some stuff is slowly getting through! Cheers and salutations from Tassie.