Lmt

[fnzpntz 10+ year member]

Why is it that most LMT's (besides the 06 XXX) have odd wound voice coils require alot of power.

(the info below is to the best of my knowledge)

SS RL-S SVC 4ohm needing 900-1200rms watts

TC Sounds LMS-4000 SVC 3ohm needing 700-1400rms watts

Why not just wind it to a SVC 2ohm or a DVC 2ohm or 4ohm?

Can any one explain why the companies do this it kind of makes them hard to easily power...

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[HotCarl 10+ year member]

Why is it that most LMT's (besides the 06 XXX) have odd wound voice coils require alot of power.(the info below is to the best of my knowledge)

SS RL-S SVC 4ohm needing 900-1200rms watts

TC Sounds LMS-4000 SVC 3ohm needing 700-1400rms watts

Why not just wind it to a SVC 2ohm or a DVC 2ohm or 4ohm?

Can any one explain why the companies do this it kind of makes them hard to easily power...

the 06 XXX isnt an LMT, it uses split coil technology....i think

 

[squeak9798 5,000+ posts]

the 06 XXX isnt an LMT, it uses split coil technology....i think

You are correct.

 

[HotCarl 10+ year member]

You are correct.

wtf, where have you been?

 

[squeak9798 5,000+ posts]

Why not just wind it to a SVC 2ohm or a DVC 2ohm or 4ohm?

TC has not yet developed a way to create a VDC (Variable Density Coil) in a dual voice coil configuration.

Is your complaint that they have a high power handling, or that they are relatively inefficient, or that they only come with higher impedance?

 

[squeak9798 5,000+ posts]

wtf, where have you been?

Uranus

 

[fnzpntz 10+ year member]

Its not really a complaint, i was just wondering to understand why they dont follow the normal 1/2/4 ohm svc/dvc setup like more subwoofers. Thats all. I more then less understand it now.

 

[squeak9798 5,000+ posts]

Its not really a complaint, i was just wondering to understand why they dont follow the normal 1/2/4 ohm svc/dvc setup like more subwoofers. Thats all. I more then less understand it now.

Basically because of the VDC coil, they haven't come up with an effective way to impliment the "standard" coil configurations. So right now the only real options are higher impedance single voice coils. Even though a single 3ohm or 4ohm coil isn't all that rare on a subwoofer. Look at the 10w7 and 12w7 for example, those are both single 3ohm coils.

 

[Bolognablake 10+ year member]

Uranus

Searching for Klingons?

//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

Man, in this time of cheap, huge, arc-welder amps, I don't think inefficiency is as big of a deal as it was a few years ago.

 

[80INCHES 5,000+ posts]

TC has not yet developed a way to create a VDC (Variable Density Coil) in a dual voice coil configuration.
Is your complaint that they have a high power handling, or that they are relatively inefficient, or that they only come with higher impedance?

wow its good to know something u dont....tc is actually comming out with a lmt thats dual 2ohm:up2somet:

80

long time no c were have u been squeak

 

[squeak9798 5,000+ posts]

wow its good to know something u dont....tc is actually comming out with a lmt thats dual 2ohm:up2somet:

That's what I get for not living on the forums anymore.......

 

[Kusan_31 10+ year member]

i have a SVC 2ohm LMT.... proto direct from TC Sounds

i hear is was a b*tch to put it in, but they got it in there. other than that, dalucifer told me the configurations probably have something to do with the amps they use. not too sure though...

 

[dalucifer 10+ year member]

i have a SVC 2ohm LMT.... proto direct from TC Sounds
i hear is was a b*tch to put it in, but they got it in there. other than that, dalucifer told me the configurations probably have something to do with the amps they use. not too sure though...

no...it has to do with the thickness of the wire that they use for a coil...If you look at an LMT coil its almost like an hour glass shape..Doesnt leave alot of room for play when its thick on top and on bottom. The thicker the wire is, the lower the impendance. TC finally figured out a way to get a dvc configuration. I havent seen it yet, so i cant really comment on it...

 

[OlogyAudio 10+ year member]

The low sensitivity that you typically see with LMT is a result of the extra winds at the top and bottom of the coil. It is effectively adding series resistance in line with the coil which increases the Qes and drops the sensitivity. This can be combated with a larger magnet structure, thicker wire, or a combination of the two. The problems associated with going for thicker wire is the increased Le since more winds are required in order to get the given BL, higher mms so if the wire size gets too large you will end up with a subwoofer that will fit in a very small box but the f3 will be much higher in freq...

If you just step up the magnet size you have to keep an eye on qes and adjust cms accordingly but you have to keep an eye on the vas and the fs when designing or you could end up with a monster and have to start over with the simulations //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif...

As for DVC LMT it shouldn’t be a big deal to design the coil with edgewound wire or thin wire and series/paralleling the coils internally in order to get the equivalent wire awg…

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