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In the Forum: Horn-Loaded Speakers
In the Thread: Vitavox’s S2 Survival Guide.
Post Subject: S2 with plastic surround.Posted by Romy the Cat on: 4/14/2005

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 guy sergeant wrote:
If you use the plastic surround S2's from 500-5KHz won't you still have the bulge that concerned you at around 1.2K? I thought you suggested that the metal suspension units didn't have this bulge.Otherwise it seems a nice idea, albeit a bit expensive for many of us to try.

S2_NoCrossover_300Hz_Horn.jpg

Well, look at the sweep of S2 with plastic surround. This is a sweep with no filter as all, a wide-open driver. If I pleace it into my 400Hz horn then it will gently roll-off 12dB++ at 800Hz. However this is a sweep in 300Hz horn. When I used the plastic surround then I presumed that 74dB (~108d with 1W) would me target output and I flatter the bubble with a first order at 3.5K (loosing 4dB sensitively). However, whan I begun to use the older cones then they are flat at 78-79dB at the presented sweep. So, it might be considered that the plastic surround cones juts have thier HF rolled-off at 3K,  could it be?If so, then it would be possible to have upper bass S2 driver that would cover from 500Hz to 3.5Hz and arrive at 4K-5K at –3dB, perhaps without using a low pass filter and let the plastic cone to kill the HF.

The caT

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