Why do some brands knowinly under-rate subs?

[TheUnderFighter 10+ year member]

You mean the dustcap has never got warm? You know that doesn't mean anything right? Also, what equipment have you used to clamp that power?

That's precisely what I mean! Haha. It never made sense to me that the dust-cap would get warm, but that's what everyone has always said to feel if the woofer is warm. I guess next time I'll pull the driver out and feel the motor //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

And I've never clamped it myself, I'm just taking a low average of the other clamped numbers I've seen around. Of course, I only play it on music, so who knows what power it's seeing with impedance rise and constantly varying frequencies.

 

[ahole-ic]

That's precisely what I mean! Haha. It never made sense to me that the dust-cap would get warm, but that's what everyone has always said to feel if the woofer is warm. I guess next time I'll pull the driver out and feel the motor //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gifAnd I've never clamped it myself, I'm just taking a low average of the other clamped numbers I've seen around. Of course, I only play it on music, so who knows what power it's seeing with impedance rise and constantly varying frequencies.

The dustcap getting warm only happens on some woofers and that is usually when the sub is being abused. Think about it. The dustcap isn't touching anything that would get hot. So air is moving around the super hot coil, then eventually gets shuffeled out to the open space in the pole piece. Then gets jostled around and eventually heats up a thermal insulator that your dustcap is made of. For it to get warm, your voice coils have to be ROASTING.

 

[denim 5,000+ posts]

Having some DAF dialed into a driver, can save some headaches.

 

[Electrodynamic 10+ year member]

The dustcap getting warm only happens on some woofers and that is usually when the sub is being abused. Think about it. The dustcap isn't touching anything that would get hot. So air is moving around the super hot coil, then eventually gets shuffeled out to the open space in the pole piece. Then gets jostled around and eventually heats up a thermal insulator that your dustcap is made of. For it to get warm, your voice coils have to be ROASTING.

You would be surprised. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Most woofers do not have a former cap and the hot air from the ID and OD of the former gets trapped under the dust cap and can make the former warm to the touch. And most woofers do not have adequate VC cooling methods which makes the problem even worse. Yes when/if your dust cap is warm your coil is VERY hot!!

 

[05fronty 5,000+ posts]

hmm ran my pair of sa's off my aq200 and never got warm. my ns seems like it wants more power lol

 

[ahole-ic]

hmm ran my pair of sa's off my aq200 and never got warm. my ns seems like it wants more power lol

AKA your enclosure is junk. People always say "x sub wants more power" which = it's not as loud as expected and they don't know what else it could be.

 

[05fronty 5,000+ posts]

AKA your enclosure is junk. People always say "x sub wants more power" which = it's not as loud as expected and they don't know what else it could be.

my enclosures are no where near junk lol. recent one

http://www.stevemeadedesigns.com/board/topic/131046-nightshade-v2-18-aq2200/

 

[disturbed471985 5,000+ posts]

Had 2 sa-8's on 1837watts clamped power without issue.. .67cf per tuned to 34hz..

 

[ahole-ic]

my enclosures are no where near junk lol. recent oneNightshade V2 18 - AQ2200 - SMD Forum

How much port area is that? It looks incredibly tiny.

 

[disturbed471985 5,000+ posts]

fronty why we got no vids yet?? Or do we and I just dont know..

 

[pro-rabbit 5,000+ posts]

How much port area is that? It looks incredibly tiny.

looks to be around 4-5" wide and around 19" tall or so.

 

[ahole-ic]

looks to be around 4-5" wide and around 19" tall or so.

That's pretty tiny for a single 18. That's probably why he thinks it "wants" more power.

 

[05trailblazer 10+ year member]

i see where this thread is going...

 

[J31Rob 5,000+ posts]

just wrote that....

That's where he heard it.

 

[SPLaudio 5,000+ posts]

80" of port is more than enough for a 18" daily.