Exactly how important IS magnet weight in a sub?

[B_Rad_NC 10+ year member]

When looking at diff subs ive always thought magnet weight was a big factor becuase the magnet is what actually moves the cone. But how exactly does the magnet weight affect the performance of the sub?

Like these for example, YES i know theyre pyramids (shame on me) but these seem like theyd be a good choice for a cheap system build

http://www.thrillaudio.com/Car_Audio___Electronics/Subwoofers_Enclosures/15__Car_Subwoofers/Pyramid-2xPW1576-2xPW1576.html

Single voice coil...4 ohms, 4 of those would hook up nicely to a 1 ohm stable amp putting out about 2000w //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

The signal/noise ratio looks good, but i notice the frequency response isnt listed, what is normally the main problem with the cheaper subs? Ive never tried any before and dont wanna find out first hand.

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[iamamp3pimp 5,000+ posts]

yes you have w the lanzarseries

 

[B_Rad_NC 10+ year member]

those lanzars were around 130 each i think, by cheap i mean the brands that are known as shitty like pyle, pyramid, legacy, etc. Lanzar seems to be a quality company even though their stuff is some what cheap.

 

[jkulysses 10+ year member]

I think Lanzar was ok quality at one time, but not anymore. Build quality would be one issue with cheap brands.

 

[Warbleed 10+ year member]

I assume by "SN ratio" you meant "efficiency/sensitivity". As far as your inital question, magnet weight is not really something I would ever focus on. Qts and Qes are far better ways to gauge how adequately motored the driver is.

Generally I prefer 0.28-0.38 for vented/IB, 0.3 - 0.6 sealed, and anything over 0.6 is generally better for IB use, or large sealed.

 

[germanyt 10+ year member]

Magnet weight is not a factor. Look at the AA Atlas and Ava. Not the largest motors ever but great nonetheless. As for Lanzar. I'd say it's average. On par with companies like MA Audio. Maybe even in the same category as Directed. But that is just an opinon.

 

[ThatChevyGuy 5,000+ posts]

dont buy those pyramids w/e you do.

 

[hoss 5,000+ posts]

magnet weight is directly proportionate with your post install fuel economy, that is about all.

 

[PSturmer 10+ year member]

its much more install dependent . my type R's have 109 oz magnets and they can still get loud

 

[cocoleveo7686 10+ year member]

its much more install dependent . my type R's have 109 oz magnets and they can still get loud

i have to agree with the install dependent part, but i think the main reason your type r's are getting so loud is because your pushing over 2000 rms to each sub and you have 4 of them, i would think this setup would get loud even if you had 4 kicker comp vr's

 

[KnOkIn It 420 10+ year member]

Weight has nothing to do with it,its the quality of the steel being used.And for a few more bucks u could pick up refurbed Kicker L5s.

 

[PSturmer 10+ year member]

i have to agree with the install dependent part, but i think the main reason your type r's are getting so loud is because your pushing over 2000 rms to each sub and you have 4 of them, i would think this setup would get loud even if you had 4 kicker comp vr's

comp vr's would fall apart with that amount of power.//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

anyways, i can get a type R louder than a l7

 

[///M5 10+ year member]

When looking at diff subs ive always thought magnet weight was a big factor becuase the magnet is what actually moves the cone. But how exactly does the magnet weight affect the performance of the sub?
Like these for example, YES i know theyre pyramids (shame on me) but these seem like theyd be a good choice for a cheap system build

http://www.thrillaudio.com/Car_Audio___Electronics/Subwoofers_Enclosures/15__Car_Subwoofers/Pyramid-2xPW1576-2xPW1576.html

Single voice coil...4 ohms, 4 of those would hook up nicely to a 1 ohm stable amp putting out about 2000w //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

The signal/noise ratio looks good, but i notice the frequency response isnt listed, what is normally the main problem with the cheaper subs? Ive never tried any before and dont wanna find out first hand.

Those are complete crap and magnet weight means jack.

 

[miker 5,000+ posts]

So why do some companies put big *** magnets on their subs?? If it doesn't matter...

 

[Kyle_Keating 10+ year member]

It does matter to a point.

Its really a lot more complex and you'll have to dive into some complex equations related to frequency response to understand the whole mess, but basically its the coupling between the fixed field B and the voice coil conductor cross section inside the flux field. This is defined as the force factor BL^2/Re.

You can pretty much straight up compare that from one sub to the next, but its not like horsepower. Too much can overdampen the driver and reduce SPL in the lower domain (outside of the port SPL). For SPL contests, too much BL is not gonna hurt at all, you really want as much as possible beacuse you're drawing all your SPL from the port only. In general too much BL is never bad because you can do a lot of other things with it if you have extra. (saturate t-yokes, make a linear-type driver, open up gaps and throw in shorting rings, etc etc this of course reduces the BL again back down to a noramal level but you can use it to implement many SQ features not found in many drivers)

For straight up SPL, I'll argue get as much BL as possible and it helps to use a large voice coil too so you can get even more BL from the motor without dancing around saturated t-yokes