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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: Re: How ya expect TD15M to perform? (see website) posted by Sanj on June 7, 2001 at 14:50:29:
Sanjay,I have been following the development of the TD15 drivers closely. I guess the first place I should start is with the 3.3mm coil overhang. If you look more closely at the specs and the design, you will see that the coil overhang is only 3.3mm, yet the suspension allows for a full 10mm of p-p travel. Then you have to consider that the gap is VERY tall relative to the overhang at 18mm. This has many effects, most obviously the high efficiency as a relatively small percentage of the coil is out of the gap, and the motor is quite strong to begin with. This long gap design, with it's extended pole piece has proven to yield higher clean travel measurements than it's overhang would imply.
The testing and experimentation Lambda has done thus far follows these expectations where the useable travel appears to be ~2x the overhang. The "M" version isn't meant to be a subwoofer. In a sealed box is will work great down to about 80Hz while still yielding 98dB/1W. In a vented or PR enclosure, you can get almost an octave lower depending on what your goals are.
You are the first I've heard to question the cone's strength, but part of what gives the cone it's strength is the relatively steep profile, and allows it to operate very high in frequency before the inductive roll-off and breakup is seen. Please go back and read through some of the details about the driver, as Nick McKinney has put up some decent info on his site.
As for output levels, they have power tested this driver at 120dB for long term with no physical failure problems, and rather astonishingly low thermal compression as measured by the rise in DCR, which they have not been able to heat much past a 10% increase in DCR. Much of this is due to the heatsinking capability of the motor which makes very good use of the aluminum phase plug as a heatsink.
If you want true bass performance, the models having a 1/2 roll surround (TD15H/X/S) have greater displacement capability, and their parameters are better suited for that application.
Mark Seaton
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Follow Ups
- Re: How ya expect TD15M to perform? (see website) - Mark Seaton 06/11/0116:15:32 06/11/01 (0)
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