I want to build a cheap boombox to replace my old longboard boombox. I have already bought a pair of 6.5in marine speakers for better weather proofing.
My previous enclosure was sealed because it was the easiest thing to do but iv been reading about different types of enclosures and if i understand it correctly am i right in thinking that a ported enclosure would improve my volume and help the battery last longer? Are ports something that can be bought and installed easily or would i need to make it from scratch? How do i work out the diameter and length of port i need?
My previous enclosure was sealed because it was the easiest thing to do but iv been reading about different types of enclosures and if i understand it correctly am i right in thinking that a ported enclosure would improve my volume and help the battery last longer? Are ports something that can be bought and installed easily or would i need to make it from scratch? How do i work out the diameter and length of port i need?
if they're like automobile coax, then their qts is likely around "1" so difficult to use in a vented box. It would take trial and error to subjectively judge whether porting adds any perceived quality. If the boombox is away from boundaries then an upper bass bump might sound ok. You can use any pipe, cardboard tubing.
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Do you have specs or a link for the speakers?
I think the normal 'rule' about which speakers to use in ported boxes assumes the speaker is for indoor use. Outdoors, you'll get less bass, so a system that's boomy indoors might be great outdoors.
IMO, anyone building a battery powered boombox should steal ideas from this thread:
http://www.diyaudio.com/forums/class-d/104402-boominator-another-stab-ultimate-party-machine.html
The budget Boominator uses fairly high Qts drivers. I applaud the decision the designer made, to simply ignore response <100Hz, as not worth attempting in his application.
I think the normal 'rule' about which speakers to use in ported boxes assumes the speaker is for indoor use. Outdoors, you'll get less bass, so a system that's boomy indoors might be great outdoors.
IMO, anyone building a battery powered boombox should steal ideas from this thread:
http://www.diyaudio.com/forums/class-d/104402-boominator-another-stab-ultimate-party-machine.html
The budget Boominator uses fairly high Qts drivers. I applaud the decision the designer made, to simply ignore response <100Hz, as not worth attempting in his application.
Yeah my Googling session for outdoor speaker building tips was pretty much totally unsuccessful, lots of info about building indoor setups and bugger all for outdoor. A fair few places selling pre-made party speakers the vast majority of which are too expensive or too heavy or too big/small or all 3. I did find some car speaker enclosures that were pretty damned close to what i want but of course they're designed for cars so they're mostly really heavy.
The speakers i bought are Blaupunkt MSx652 2-way coaxials, the specs are:
RMS of 40 watts,
Impedance of 4 ohms,
Frequency response of 60 - 22000 Hz,
Sensitivity of 92 dB.
I fully expect there to be significantly more spectacular speakers i could have gotten but i have a limited budget and iv had occasional incidents where bicycles have crashed into the speakers so i got something relatively cheap to replace...
The speakers i bought are Blaupunkt MSx652 2-way coaxials, the specs are:
RMS of 40 watts,
Impedance of 4 ohms,
Frequency response of 60 - 22000 Hz,
Sensitivity of 92 dB.
I fully expect there to be significantly more spectacular speakers i could have gotten but i have a limited budget and iv had occasional incidents where bicycles have crashed into the speakers so i got something relatively cheap to replace...
They don't have any detailed specifications available, so my guess is the same as what freddi said: their qts is likely around "1" so difficult to use in a vented box
...so I'd go for a sealed box. The Boominator thread is still worth a read for loads of tips on construction, battery life etc.
For example, having the drivers oppose each other, with magnets braced together, looks like a great way to stiffen the box without adding weight.
...so I'd go for a sealed box. The Boominator thread is still worth a read for loads of tips on construction, battery life etc.
For example, having the drivers oppose each other, with magnets braced together, looks like a great way to stiffen the box without adding weight.
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