Hi all,
I have been on the look out for a random box as a starting point for a
bedside speaker project. I came across this in a charity shop today. It
is a wine box of really solid 10mm hardwood construction:
35980
The plan is to build pi, screen and amp into the top section and close
up the bottom section to form the speaker enclosure. Look, see how the
Waveshare 5inch screen is going to fit perfectly!
The goal is not hi-fi here obviously, but something comparable with a
~£100 bluetooth speaker would seem worth the effort since the box is
really quite nice and it should sound as good as it looks. I have a
number of questions from the off.
SPEAKER ENCLOSURE:
- *Any advice on a suitable driver(s)?* The enclosure volume is ~4.3l
- *Ported or sealed?* My thinking on this so far is that sealed is
going to be more forgiving and offer more bass extension from a small
driver (at the expense of efficiency) - I just need to find a driver
that is a good match for the volume of the box. I feel I could get a
ported enclosure wrong.
- *Mono, full-range seems the most sensible and easiest.* Any driver
recommendations?
- *Any recommendations for a 2-way kit?* With or without a bass port
tube?
- *Stereo or mono?* Not going to get much stereo field when the
drivers are so close but I could separate the box into 2 sections but
that halves the volume. Could do some fancy mixing of the lows to mono
and have stereo tweeters but complexity is going up. Is putting both
speakers in the same enclosure so bad? The advantage of going stereo
is that it makes selecting an amp easier but the more drivers the
greater the cost (or lower the quality).
AMPLIFIER:
I've already had good results with the Hifiberry Amp2 elsewhere, but
that seems overkill. I feel that the various small class-d amp HATs that
run off 5V would be a little underpowered for this, especially in a
sealed enclosure design. Am I wrong? Doesn't have to be a HAT, in fact
it might help with fitting it in the box if it wasn't. Could break it up
into DAC and amp modules if necessary.
I feel I'm looking for about 15W RMS mono. Class-D seems like a good
choice for both quality and efficiency.
*Any recommendations? *Separate modules, some soldering required would
be fine.
I've always been interested in speaker building but the investment of
time and money coupled with the danger of wasting both has put me off.
The stakes are low here but I'd like to learn as much as I can and get
the best result. Interested to hear of your successes, failures and
lessons learned on similar projects. Thanks for your thoughts in
advance. Looking forward to posting a thread when the project is
finished.
Tom
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