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In Reply to: RE: A simple cabinet posted by b.l.zeebub on March 02, 2017 at 04:45:29
Yes, it is PA 130. Thanks for the simple solution.
My thrift store Sony speaker boxes are 4.5 l and of 1/2" Particle board which actually is 'better' than MDF of same thickness ..(spare me the material preferences) 4$ the pair.
But one can always get out the skill saw / drywall screws and make your own.
Without doubt they will be luuvely to look at.
Don't forget to line the box with something. I'd use open cell foam of a suitable thickness.
This should remove any potential boxiness from the sound which in my experience is mostly internally reflected sound exiting through the cone.
The 4.5L AS design or a 6.5L Ported design. Which will be simply better?
Better is a relative term here.
Sealed box will start rolling off earlier but at a gentler curve (-12dB/oct) while ported it will go flat to driver Fs and then drops rather rapidly at -24dB/oct.
You may run into problems ported because it is quite possible (but not necessarily so) that the port ends up rather large and the port tube must NOT be counted as part of the box volume.
Consequently it is quite possible that to get a box with a 6.5L volume net requires a gross volume of 10L just to be able to accommodate the port tube.
It may not be this way since I have not calculated the port needed but it is a distinct possibility.
However not too long ago I built some little 2ways for my daughter to take to Uni.
They are ported (I struggled but eventually found a suitably short tube design but it did need 3 smaller ports to make it all fit into a 6L box) and blocking the ports does only produce a subtle change in the bass.
With that in mind I'd go sealed. If you get the material cut to size you can knock up a pair in an afternoon rather than spending hours on WinISD calculating ports, trying to find a suitable tube, fitting it etc.
Also wideband drivers often make very good mids and if the driver turns out really nice you can add a woofer later and may be even a tweeter (note: I am a fan of 3way speakers).
Thanks a lot. You have made life simple for me with portless thoughts. I love midrange, especially female voices. Joni, Janis, Gaga, Mariah Carey, Maria Callas et al.
Female voices are a tough test!
Mostly because they reside completely in the midrange. Male voice have more lows obviously but rather surprisingly more top end too.
Let me know how that little driver works out as I'm always in search of a good mid!
Good luck and have fun building and listening.
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