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Old 16th April 2019, 12:14 PM   #11
avtech23 is offline avtech23  Australia
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First build: Boombox for a friend.
Originally Posted by OffGridKindaGuy View Post
I build portable units on the cheap. I have discovered portable units aren't quite big enough to even try to get the stereo effect so why bother.
That is a really interesting thought.

I struggle to keep design dimensions/weight down whilst trying to keep volume optimal. Going dual coil/single cone might just help me with that. Thanks!
The ever growing project list.. :NAP140 Clone, NAD 3020i & 3225PE, JLH1969, TDA2050, Fender 5F2A Princeton, NE5532 Pre, SHPA, B1 Korg. : VSQC Phunk Style, Retro 50W, Filmosound 601, LM4780. : Apex AX-14, TGM-10, TDA7265 (Last in line)...maybe
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Old 16th April 2019, 12:27 PM   #12
picowallspeaker is offline picowallspeaker  Italy
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I build portable units on the cheap. I have discovered portable units aren't quite big enough to even try to get the stereo effect so why bother.
That is a really interesting thought.
But it isn't well described; it isn't just the distance between the speakers, but how they are phisically detatched
Freestanding speakers sound distinct on their own because they are two units, like us, we don't have one coclear expansion all around the face with two holes in it, he have two distinct ears at the sides of the head
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Old 16th April 2019, 12:34 PM   #13
Galu is offline Galu  Scotland
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Posts #7 and #8 seemed to just pop up between our posts #6 and #9. I didn't see them there when I posted! Anyway, they show that d3c0y is appreciative of your suggestion so I should just have kept my mouth shut! Apologies again.

I, too, am curious about the internal arrangements. They seem unnecessarily complicated and requiring of an explanation of the thinking behind the design. d3c0y please note.

My take would be two acoustically separate compartments. I would go for sealed, but also like your suggestion of 'untuned' slot ports.
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Old 17th April 2019, 12:15 AM   #14
OffGridKindaGuy is offline OffGridKindaGuy  United States
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N/P Galu.. I know that your intentions are good like mine. Let's get some beer and help this fella out..

@picowallspeaker.. I figure a portable unit is usually one box/enclosure with everything inside. The goal is high SPL with good fidelity in the smallest size possible without a bunch of fancy electronics. (Old school design) I guess one could design a unit with detachable speakers but one would still need to seperate them 6 ft. or more to bring the stereo effect alive, wouldn't you agree?

@avtech23.. I gave up on trying to get stereo from a spread (seperation) of usually less than 3 ft. Granted, 2 drivers does give some increase of SPL but is the gain enough to justify an enclosure that is twice the size than it needs to be? If 2 drivers at 87db/watt is used, perhaps 90db may be expected. One dvc full range of some quality at 90db is used, what is lost? Half the needed enclosure size! One can even make the enclosure a little bigger than needed for some "boomier" bass and still keep the size within reason. Just another brain fart from a non-scientific old guy that likes to experiment..

@d3c0y.. Build that rascal and see what happens! I agree with Galu. 2 separate compartments. Just don't epoxy the drivers in.. The magic is you can always go back to the saw and try again..
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Old 18th April 2019, 02:16 AM   #15
d3c0y is offline d3c0y
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Hi guys, sorry for intermittent replies, don't get many chances to get on and check around at the moment.

To be honest, I'd be a little iffy of breeching any forum rules for part of the design intent, but suffice to say there will be a 150x150x150 acrylic box mounted in there for shisha, and the possibly unnecessary complexity internally was trying to minimize paths for any fluid toward electronics incase things happen as they do.
Figuring a bead of silicon on the tank side edges of the wall should avoid seeping and lining the mdf in that segment to avoid damage.

With that oddity/awkwardness on the table, I'd understand any shying away.

Otherwise generally dimensions came about from looking at people's homemade bookshelf speakers as a reference, the angled panel in there is likely ill thought though.
I read along my browsing something about avoiding an entirely flat back in the box if possible to reduce any dissonance. typing this out makes me realize i need to go read about on that.

All learning though at this point, I will have spare material after i do this so thinking I may have a crack at properly making a set of audio monitors(big jump I know), but it'll be for me then, so I will be able to take my time. They would be going with my VSTi box and drums....but for another time/thread.
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Old 18th April 2019, 02:23 AM   #16
d3c0y is offline d3c0y
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Doh did it again, I might try just building the box without the internal complexity initially and see how it sounds, I can understand the questioning of over design completely honestly and kind of have a bad habit of doing it.

If part of the project is not of consequence, I will post a drawing with, at this stage the entire internal layout before i start tinkering with internal baffles and ports.

Thank you again!
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