4" Voice Coil?

[AI James]

RE Audio mx has a 4" coil.

you beat me to it.

i dunno where you got that more excursion though Amalan. MX only has 22mm excursion

[Guest donpisto]

RF TRF were and I think they were made by TC sounds.

Treo have some the old RF power hx2 had them.

Same motor (4HP). The TC 5400 uses a 4HP motor, also the 4HP sub itself has the 4HP motor (duh). The old Cactus Sounds subs also used the 4HP motor.

[Amalan]

you beat me to it.

i dunno where you got that more excursion though Amalan. MX only has 22mm excursion

hmm thats true didnt think about that. i was thinking of the tc sounds lms

Edited November 15, 2007 by Amalan

[Amalan]

i dont know if i am overgeneralizing but wouldnt 4" coils be "narrower" than a 3" one most of the time its used. like the mx it was used for cooling easier iirc

narrower? how is a bigger diameter narrower than a smaller one?

[Guest MegaloManiac]

i think i confused myself...

Edited November 15, 2007 by MegaloManiac

[Forevrbumpn]

Benifits, and cons of 4" vs 3" coils

4" More power handling - more surface area

3- 4 times heavier than a 3" coil on average

can take alot of abuse over a 3"

3" is more efficient due to weight over 4"

And cost, due to all that steel and ferrite in a 4" motor will cost you about 3-4 times as much, and then the magnet charging costs for electricity, can you say 2-3-4million watts every charge???

Welp, thats about it really, for a ground pounder, cool, but if you want that extra DB, well, how many subs hit over 160db with a 4" coil? not many, over 160db is DOMINATED by 3" coils due to lightness over 4" coils, and 3" efficiency

[MickyMcD]

A larger voice coil allows for improved heat disspation, even weight and drive on the cone and helps prevent cone resonances. Older drivers from the 60's and 70's mostly had very small coils (usually 1.5/2" on 15" drivers) and as a result have very 'ringy' cones that tend to resonate during normal use.

A larger coil, through the acts of heat dissapation and power handling, reduces annoying, and for car audio concerns volume losing, Power Compression. The Ramsdell Pro Audio BP-SD21, 21" Band Pass Subwoofer - 'The Sub Engine' has some of the lowest power compression figures in the industry thanks to it's 6" voice coil.

Cheers,

Mick

[Forevrbumpn]

well spoken Micky ;-)

The first paragraph was just on PA speakers, but yeah.... I always wanted to build a sub that had a super light coil that equals half the cones diameter, for strength, and resonance free sound