18" Drivers, are they worth the trouble?

PetarLD · 28th July 2004, 06:51 PM

Hi, today I went to a salvage store to buy some books, and I couldn't help noticing these 2 18" drivers standing on the shelf there. I picked it up and they had a single voice coil, no labeling on them at all. The magnet seemed a little bit too small, the excursion was around 8 to 10mm. Since I am going to need some drivers no matter what for my senior project in high school. These were sold for $15 each. I think they would let me take pictures of them, and would anyone be interested in seeing those pictures?

I think these are a real bargain no matter how crappy those drivers are. The frame is stamped not layed out of whatever the frames are usually layed. I am going to build Rod Elliot's Project 68 probably the 500W version, and I think these should handle it, both driven from the same amp.

Thanks, Petar

bhg41088 · 28th July 2004, 06:53 PM

offer them 25 for the pair and use them in a W frame Dipole.

454Casull · 29th July 2004, 01:05 AM

Quote:

Originally posted by bhg41088
offer them 25 for the pair and use them in a W frame Dipole.

Can't go wrong with this idea.

Sandy H. · 29th July 2004, 01:29 AM

What is your senior project? Would it involve construction of something or analysis of something. If it is both analytical and construction oriented, then these could be a good project. Measure the driver’s TS parameters and regardless of what they are, determine their best use and then build that product. I have found, for me, that using all of the software-based programs to measure TS parameters is easy, but it doesn't bring a good understanding of the real parameters. Recently, I have chosen to measure them using only a generator (PC soundcard based) and a DMM and the mass added method. If nothing else, I have gained a better understanding of what the numbers mean.

If your project encourages both analyzing and building, these could be a great start.

But offer $25. . . or $20 for the pair. If it is for a school project, they may offer an even better deal.

Sandy.

PetarLD · 29th July 2004, 02:44 AM

Hi, the senoir project in my school involves in building something and writing a paper about, then presenting the whole thing in front of a jury of judges. So wanted to build something that I can use later, and I already have 2 nice loud speakers that I want to add some bass to. And I don't think they could hande 300-500W. I am going to the store tomorrow, and I am going to bargain them for $20 since I only have ~$150 to spend on this thing anyway.

I think I will go the you don't know what kind they are what paremeters they have, and I am going to ask them what they based the price on, and try to convince them that they are not even worth that much.

Many thanks, Petar

PetarLD · 29th July 2004, 02:49 AM

Sandy H. I noticed you live in Charlotte, NC. I currently live in Morganton, NC about an hour and half from Charlotte.

eRiCdWoNg · 29th July 2004, 05:09 AM

Not to hijack, but Ive heard of H frame dipole, but wth is a W frame dipole?

bhg41088 · 29th July 2004, 05:25 AM

http://www.linkwitzlab.com/woofer.htm

28th July 2004, 06:51 PM	#1
PetarLD diyAudio Member Join Date: Feb 2004 Location: Sofia	18" Drivers, are they worth the trouble? Hi, today I went to a salvage store to buy some books, and I couldn't help noticing these 2 18" drivers standing on the shelf there. I picked it up and they had a single voice coil, no labeling on them at all. The magnet seemed a little bit too small, the excursion was around 8 to 10mm. Since I am going to need some drivers no matter what for my senior project in high school. These were sold for $15 each. I think they would let me take pictures of them, and would anyone be interested in seeing those pictures? I think these are a real bargain no matter how crappy those drivers are. The frame is stamped not layed out of whatever the frames are usually layed. I am going to build Rod Elliot's Project 68 probably the 500W version, and I think these should handle it, both driven from the same amp. Thanks, Petar

28th July 2004, 06:53 PM	#2
bhg41088 diyAudio Member Join Date: Feb 2004 Location: Tennessee	offer them 25 for the pair and use them in a W frame Dipole. __________________ -

29th July 2004, 05:25 AM	#8
bhg41088 diyAudio Member Join Date: Feb 2004 Location: Tennessee	W-Frame http://www.linkwitzlab.com/woofer.htm __________________ -

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29th July 2004, 01:29 AM	#4
Sandy H. diyAudio Member Join Date: Nov 2002 Location: Charlotte, NC - USA	What is your senior project? Would it involve construction of something or analysis of something. If it is both analytical and construction oriented, then these could be a good project. Measure the driver’s TS parameters and regardless of what they are, determine their best use and then build that product. I have found, for me, that using all of the software-based programs to measure TS parameters is easy, but it doesn't bring a good understanding of the real parameters. Recently, I have chosen to measure them using only a generator (PC soundcard based) and a DMM and the mass added method. If nothing else, I have gained a better understanding of what the numbers mean. If your project encourages both analyzing and building, these could be a great start. But offer $25. . . or $20 for the pair. If it is for a school project, they may offer an even better deal. Sandy.

29th July 2004, 02:44 AM	#5
PetarLD diyAudio Member Join Date: Feb 2004 Location: Sofia	Hi, the senoir project in my school involves in building something and writing a paper about, then presenting the whole thing in front of a jury of judges. So wanted to build something that I can use later, and I already have 2 nice loud speakers that I want to add some bass to. And I don't think they could hande 300-500W. I am going to the store tomorrow, and I am going to bargain them for $20 since I only have ~$150 to spend on this thing anyway. I think I will go the you don't know what kind they are what paremeters they have, and I am going to ask them what they based the price on, and try to convince them that they are not even worth that much. Many thanks, Petar

29th July 2004, 02:49 AM	#6
PetarLD diyAudio Member Join Date: Feb 2004 Location: Sofia	Sandy H. I noticed you live in Charlotte, NC. I currently live in Morganton, NC about an hour and half from Charlotte.

29th July 2004, 05:09 AM	#7
eRiCdWoNg diyAudio Member Join Date: Jul 2003 Location: maryland, USA	Not to hijack, but Ive heard of H frame dipole, but wth is a W frame dipole?

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