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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: Drivers for existing cabinet posted by Bill the K on May 2, 2024 at 05:36:50:
Hi
Ok that small space means that your choice of crossover points is pretty wide open.
OTH, your thought about using a full range driver also has merit.
About 15 years ago at work i designed a small "fill" speaker that used a Fostex 126 full range driver with two small woofers.
Yesterday i had to see how the new version of the Fostex 126nv2 measured in that same cabinet.
There is a property the late Dick Heyser measured called Energy/Time Curve or Envelope which shows how fast the sound stops radiating from the driver after the signal ends.
The 126 has an unusually good ETC, at 10 inches distance the energy from the driver fell more than 50dB in just a few ms (50dB = 100,000:1 energy ratio) .
That is a very good sign as the biggest issue loudspeakers usually have is all the sound they produce and arrives that isn't directly tied to the input signal. That's the stuff that lets your ears triangulate on the speaker distance AND disrupts the acceptance as real of the illusion in the recording
This driver is large compared to 20KHz (wl about 5/8 inch) and I have not measured the polar pattern (it will have significant directivity up high) but on and near on axis, on a nice baffle (that doesn't cause re-radiations) that driver should provide an excellent stereo image. Like i said, that ETC property is a very good indicator so far as imaging.
At a modest distance, in the right bass tuning, this would be very satisfying speaker.
OTH, it will not produce much bass and if used in your box, you would want to model that driver in your box volume to see what port length gave the best results.
Your other options would be to use a tweeter that went down low and use a 6.5 inch woofer. That old speaker i was working on has 2x 5 inch woofers and the fostex .
For that you will need a new crossover. IF you have a lot of overlap, and drivers less than 1/4 wl at crossover, a first order crossover can sum into a "no phase shift" crossover like a single driver, unlike all the other named slopes 2nd order and above.
Alternately, if your boxes went down into the 60's alone, you would be able to hid a small subwoofer the do that bottom octave or more.
I have not looked at that driver so far as bass in many years but the measurements yesterday I thought were worth mentioning.
Subwoofers are the easiest speakers to make and with a low enough crossover can blend in.
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Follow Ups
- RE: Drivers for existing cabinet - tomservo 06:10:39 05/03/24 (0)
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