sub magnets

[FNG212]

A buddy and I were looking at drivers for various applications. I was looking at stuff like T/S parameters and cone material (its a stick for me, no idea why). He just wanted to know how big all the magnets were on the drivers. I started to notice that magnet size/type was hardly listed on any driver details.

Is magnet size/type relevant at all? Do any of you take it into consideration when selecting drivers for a build? Thanks.

 

[TLS Guy]

A buddy and I were looking at drivers for various applications. I was looking at stuff like T/S parameters and cone material (its a stick for me, no idea why). He just wanted to know how big all the magnets were on the drivers. I started to notice that magnet size/type was hardly listed on any driver details.

Is magnet size/type relevant at all? Do any of you take it into consideration when selecting drivers for a build? Thanks.

No. There is an inverse relationship between flux density and bass extension, and therefore efficiency, which is unfortunate, but that's the physics of it.

The Thiel/small parameters and linear cone extension are the crucial issues.

 

[highfigh]

The weight of the magnet used to be a selling point but once enough people lost interest in knowing it, the manufacturers stopped making noise about it. It matters, but not so much when it's a woofer for most applications. It's part of the motor structure and is part of the design but, along with the voice coil, it's more important to the speaker's sensitivity than actual sound quality.

 

[BoredSysAdmin]

Speaking of magnets - I wonder how does Dayton's new Neodymium subwoofers affect the output or subwoofer enclosure design?

 

[mike c]

i believe the main benefit of neodymium is the size and weight (it's a lot smaller and lighter) ...

 

[highfigh]

Speaking of magnets - I wonder how does Dayton's new Neodymium subwoofers affect the output or subwoofer enclosure design?

If they make one driver and use different magnets, the characteristics can be different. They're using neodymium on instrument and PA speakers quite a bit, with good results.

 

[Warpdrv]

Speaking of magnets - I wonder how does Dayton's new Neodymium subwoofers affect the output or subwoofer enclosure design?

With an Xmax of only 7mm I would look elsewhere for the same money offered.

AESpeakers has some amazingly designed products for not much more sporting 3 times more excursion and likely better control, even though they are not Neo magnets, it would be money spent better... Very efficient as well..
http://www.aespeakers.com/shop/catalog/

 

[Warpdrv]

John on AE Speakers has a very good knowledge base article spanning multiple pages on inherent design application of the motor section of a driver.

Its a great read..... found here - hit next page on the bottom to continue.
http://www.aespeakers.com/Lambda001-1.php

Also, TC Sounds has a great page of subwoofer information...
http://www.audiopulse.com/know-how/subwoofer-driver-guide/myths-about-subwoofers/

 

[highfigh]

One of the reasons lighter speakers are becoming more popular is that for a live concert sound company or even just a local band, they can save a whole lot of money and/or effort in a short time by using the lighter option. Not only does it cost less for fuel, the rigging can be smaller, which adds to the fuel savings. The crew doesn't have to work as hard and that makes them last longer. Speaker sensitivity, excursion, etc can be built into the driver but live sound and in-home use are two completely different things.