Does this woofer have an alnico magnet?

[marcusekner]

In a webshop here in sweden: http://www.hifikit.se/index.php?id=146
Translated to english: http://translate.google.se/translat...ifikit.se/index.php?id=146&sl=sv&tl=en&swap=1

 

[Audio_Works]

I doubt it, looks like a regular screened magnet system.

 

[marcusekner]

I doubt it, looks like a regular screened magnet system.

I e-mailed the store, and they say It's an Alnico. Most alnicos I have seen have the normal square plate bent over the magned, but I have also seen this kind of rounded cap on some models. I am just curious. I have ordered a pair of them now because I want to check them out and maybe fit them in a pair of cabinets I have.

 

[Stephen J]

Is this

a modern driver ? Ya know newly manufactured. :scratch2:
EDIT : Sorry didn't click the link. I read new production AlNiCo drivers are available.But on the expensive side.
Were they costly ?

Vintage Jensen AlNiCo speakers with rounded ''Bell Covers''....

 

[bowtie427ss]

Hard to tell from the pic if we're looking at a return pot or just a magnetinc shielding can on the hind end of that thing.

I would speculate that it's a good bit deeper than it would need to be to house a ferrite or neodymium motor, so alnico stands to reason in that respect.

 

[marcusekner]

a modern driver ? Ya know newly manufactured. :scratch2:
EDIT : Sorry didn't click the link. I read new production AlNiCo drivers are available.But on the expensive side.
Were they costly ?

Vintage Jensen AlNiCo speakers with rounded ''Bell Covers''....

Oh, you must have been in a hurry to have (mis)read that twice It IS a newly manufactured Alnico driver. According to the store, the speakers have Alnico magnets. The company that makes the Gamma brand speakers have a reputation of being hard to get in contact with. I figure they want to make business, but they seem to think otherwise. Anyways - I have only seen the Gamma brand drivers in the shop I posted before.

They were not that costly. About 25usd each, plus shipping, in total about 60usd. I sure hope their availability (other than this particular store) and price do not reflect to anything bad in their sound quality. I have high hopes for some Alnico magic, maybe too high.

 

[marcusekner]

Hard to tell from the pic if we're looking at a return pot or just a magnetinc shielding can on the hind end of that thing.

I would speculate that it's a good bit deeper than it would need to be to house a ferrite or neodymium motor, so alnico stands to reason in that respect.

It sure is hard to judge by that picture, but I agree with you, they do seem a bit deep. How is the pot better (or why is it used at all?) as opposed to the more traditional square plate on alnico magnets?

 

[bowtie427ss]

It sure is hard to judge by that picture, but I agree with you, they do seem a bit deep. How is the pot better (or why is it used at all?) as opposed to the more traditional square plate on alnico magnets?

No expert here, but i would guess that the pot being fully circumferential to the magnet slug and front plate makes for a more uniform magnetic circuit, and more evenly distributed field in the gap, and also doubles as a shield to prevent any stray magnetic energy from leaving the motor.

I generally equate the formed plate circuits to be cheap and incomplete by comparison to a pot. Some have the side "windows" sealed off with a foil type material to prevent debris from entering the gap from the rear, others do not. The sealed off type don't cool well and rely heavily on a vented dustcap.

Just my .02.................

 

[marcusekner]

No expert here, but i would guess that the pot being fully circumferential to the magnet slug and front plate makes for a more uniform magnetic circuit, and more evenly distributed field in the gap, and also doubles as a shield to prevent any stray magnetic energy from leaving the motor.

I generally equate the formed plate circuits to be cheap and incomplete by comparison to a pot. Some have the side "windows" sealed off with a foil type material to prevent debris from entering the gap from the rear, others do not. The sealed off type don't cool well and rely heavily on a vented dustcap.

Just my .02.................

That makes sense. Thank you

 

[Renzor213]

Who know's. Why don't you unscrew the magnet basket cover and find out. Most Alnico magnet assemblies I've seen have a square metal frame supporting the center magnet material. Hope this help's.

 

[marcusekner]

Got the speakers today, I've got them set up in temporary enclosures and they sound great. A little bit bright, but that might well be because they are run without a crossover for now.

EDIT: I double-side-taped a piece of foam (very thin, like paper) to the hard plastic dustcap and the bright sound is gone now, very pleasing. They sound clear and detailed, yet forgiving. And they really bring out that sweet vibrato of guitars. Very happy with my purchase, especially considering these are the cheapest new drivers I have bought in years.

 

[Thespeakerdude8]

No expert here, but i would guess that the pot being fully circumferential to the magnet slug and front plate makes for a more uniform magnetic circuit, and more evenly distributed field in the gap, and also doubles as a shield to prevent any stray magnetic energy from leaving the motor.

I generally equate the formed plate circuits to be cheap and incomplete by comparison to a pot. Some have the side "windows" sealed off with a foil type material to prevent debris from entering the gap from the rear, others do not. The sealed off type don't cool well and rely heavily on a vented dustcap.

Just my .02.................

It reminds me of your typical button slug AlNiCo speaker for a small antique radio, as far as the magnet style goes...its been around a long while.