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Old 26th August 2007, 02:52 AM   #1
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Default Wraith Electrostatic Subwoofer Eh...

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Wraith speakers cover a frequency range of below 15 Hz to over 20,000 Hz with SPL's exceeding 120 decibels. The Wraith subwoofer goes down to 10 Hz and exceeds 115 decibels at 30 Hz.
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http://www.wraithspeakers.com/pg2.html

What????
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Old 26th August 2007, 04:23 AM   #2
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Like audio specs everywhere, you have to read between the lines- what they don't say tells you more than what they do say. 10 Hz response from a 36 x 24" ESL? Sure, if you run it at very low volume, and put the test mic right up against the speaker.

The frequency response specs do not say what SPL is achievable at the low end.

If you have any ESLs, try this experiment- put your ear right up against the speaker and see how low the freq response goes. Now back up to a normal listening distance and see what happens to that low freq output.

There are no mysterious mysteries here.

Oh yeah, patents.... the web page doesn't have any numbers, but I'm guessing they involve the design- i.e. the appearance, of the speakers, not some special technology that allows them too reproduce very low freqs at high volume levels.

I_F
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Old 26th August 2007, 06:03 AM   #3
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You can surmise from the limited specs given that it is -3db @ 15hz. That still doesn't give any hint as to how loud it will play at that frequency. The efficiency isn't anything to brag about either at 88dB (probably 2.83v/1m).
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Old 26th August 2007, 07:14 PM   #4
tvi is offline tvi  Australia
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These seem to be relevant:
Electrolytic loudspeaker assembly US6819769 2004-11-16 ZIMMERMANN CLAUS
and
US5392358 1995-02-21 DRIVER MICHAEL L

Regards
James
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Old 27th August 2007, 06:21 AM   #5
Calvin is offline Calvin  Germany
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Hi,

typical fantasy-specs

I tried to figure out if there is just one novelty in the Zimmermann patent. I didn´t find it, apart from the misleading word ´electrolytic´. Anyone more successfull?
Btw. The same is with a later ´Acoustaguard´ patent of Zimmermann.
This guy seems to write rather non-value patents with as many words and repititions as possible to fool the patent-office into granting him patents that he can use for marketing purposes.

jauu
Calvin
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Old 27th August 2007, 03:46 PM   #6
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110dB @ 30Hz is good for an electrostatic? It cant be 110dB next to the panel and not still be pretty loud.
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