Re: Does Speaker Size Matter


"Cliff" <cliff@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
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On 9 Jan, 12:18, "christofire" <christof...@xxxxxxxxxxxxxx> wrote:
"Cliff" <cl...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message

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On 8 Jan, 19:23, "christofire" <christof...@xxxxxxxxxxxxxx> wrote:
"Cliff" <cl...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message

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I've just completed building a 5W valve amp. It's was an amp kit,
Aston Electronics VK6V6MV and I'm very pleased with the results. For
sound quality think mini blackface fender. Anyway, I've been running
it through the 16 ohm speaker in my Peavey Classic 20. Now I'm
considering building a speaker cab for it.

The main aim is good quality sound at low volume. Would an 8" speaker
sound better? Could an 8" speaker be turned down lower and still
produce a decent tone? Would a closed back cabinet be more
directional
and so, keep the sound more in one place? Anyone have any thoughts on
this?

By the way, I was considering a Celestion Super 8 - Any good?

Thanks, Cliff

Considering that sound only comes out of the front of a closed-back
cabinet,
wouldn't it be likely to be less 'directional' than one that radiates
sound,
with some phase difference, also from its back?

To put it another way, the radiation pattern of a closed-back cabinet
will
always be simpler than that of an open-back one, but sometimes the
contribution from the back can be helpful to the tone - it can cause
frequency-selective effects that wouldn't happen in the case of a
closed-back cabinet.

However, all radiators that have 'aperture' (i.e. diameter) are
directional
to some extent and larger apertures tend to have more-directional
radiation
patterns - so an 8" speaker may be a better bet than a 12" one if
you're
seeking to emulate a 'point source' of sound.

Chris

I was thinking a closed back may be a better option if I want to
reduce the amount of sound transfered around the house. I have this
picture of an open back design bouncing bass of the walls behind the
amp and it seems to be the bass frequencies which travel around a
house and desturb others.

If a closed back cabinet throws most of the sound forwards, it may be
possible point the amp at a more sound absorbent wall then, sit
between the amp and wall. The idea is to kill more of the sound before
it travels in all directions around the house.

Does this sound sensible or just nonsense science ;-)

Cliff

Well try it and see if it meets your requirements.

To many it probably seems counter-intuitive that a speaker in a
closed-back
cabinet should radiate bass sounds in all directions, but it does, and may
do so more than an open-back cabinet (in which case near-cancellation may
occur in some directions at some frequencies). Of course, the result in
any
case would depend on the environment: what walls, furniture, etc. surround
the speaker and how far away they are.

Chris- Hide quoted text -

- Show quoted text -

Thanks for your replies, interesting.
I suppose the easy answer is to make a cabinet with a removable back.

Cliff

.... absolutely right.

Chris


.

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