[geeks] Built my first speaker enclosure

[erie patsellis]

Lionel,
I loved the pair of EV30's I had, though they are really impractical if 
you ever have any thoughts of not being single or a celibate monk.

Voice coil size only (used to, newer tech and materials has changed 
everything) to be a good indicator of power handling.

Bass response of a speaker system, (comprised of driver and cabinet) as 
well as how quickly response drops off (specified as Q) is a function of:

The natural resonant frequency of the driver. (Ft)
The drivers effective volume of air. (Vas)
The combination of electrical (Qes) and mechanical (Qms) Q of the driver 
(Referred to as Qts)
Cabinet volume
Cabinet design (ported, acoustic suspension, pass band, etc)
Stuffing of the cabinet (affects relative volume, can increase volume 
about 15-20% if properly filled)
Crossover design.

All of this can be pretty easily modeled by inexpensive to free (as in 
beer) software readily available.


erie
Lionel Peterson wrote:
> On May 2, 2010, at 3:51 PM, Bill Bradford <mrbill at mrbill.net> wrote:
>
>> It puts out more than enough bass for my purposes.  8-)
>
> Again, your enjoyment is only meaningful metric.
>
> I know I've mentioned the 30 inch subwoofer I saw in Rochester, NY 
> before, it had a voicecoil about six inches across - and as I 
> understand it, the larger the voicecoil, the lower the speaker goes. 
> Not sure if that is a rule or an observation that applies in most 
> cases...
>
> Once I saw that, that became my mental image of a subwoofer, of 
> course, that is an unreasonable standard in most cases...
>
> Lionel
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