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Multi-Way Conventional loudspeakers with crossovers

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Old 7th October 2012, 04:37 PM   #21
Bare is offline Bare  Canada
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Don't think you are going to get a helluva lot of depth /bass/dynamics out of a Teeny driver. Unless one cobbles together a bespoke refrigerator/coffin sized Box to maximize every last erg of energy.
In which case simply buying a ~8" min diam driver would be a far simpler, easier to live with solution. Likely work better too.
Clearly your expectations are not meeting your size restrictions?
Decent headphones are a passable and often very good compromise while traveling.
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Old 7th October 2012, 05:16 PM   #22
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I think that Aurasound offer some tiny speakers with extended range and some fullrange drivers. Reviews are quite favorable. With 3 inches dia. you should have enough highs and they seem to provide decent bass.
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Old 7th October 2012, 06:20 PM   #23
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Looking at my original suggested speaker from Parts Express, the DS135-8, the spec sheet states it requires 7.55 liters, or 460 cubic inches, ported. The tweet is sealed. Why are we talking about refrigerators? Thats a 7" cube inside dimensions! The whole system could be done within a box 16 x 8 x 8". What am I missing here?
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Old 8th October 2012, 12:58 AM   #24
Dissi is offline Dissi  Switzerland
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Yes, Vas of the driver is 7.55 litres. But Vas is not the required volume of the ported box. PE specifies 0.17 cu ft (=293.76 cu in).

Volume calculations seem to be tricky. I realized, i also have posted wrong values in reply #11. So let me resume what we have so far:

Assuming an overall size of 16 x 7 x 5 and 1/2" walls, after subtracting the volume of vent and driver magnet, we get a volume of 0.092 cu ft. This volume is further reduced by crossover, battery, amp, interface and connectors. We end at a remaing volume of maybe 0.02 cu ft.

Now the same calculation with new dimensions. The box is 16 x 8 x 8. After subtracting vent and magnet, we have a volume of 0.2 cu ft (=345.6 cu in). Minus the estimated value of 0.072 cu ft for the extras gives 0.128 cu ft.

Conclusion:
The small box doesn't work at all. The bigger box looks better. But the volume is still to small to use a 5" driver. It could work with a 4" driver. Maybe the Dayton DS 115-8?
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Old 8th October 2012, 01:07 AM   #25
CLS is offline CLS  Taiwan
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How about this:

Something a little different: quick-and-easy iPod Horn

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Old 8th October 2012, 01:14 AM   #26
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Firstly, the dimensions do not include the amp, or battery. As stated, I would provide an additional space for those, but they are not important for speaker calcs. Secondly, the 7" dimensions are not in stone. The speaker says it needs 460 cubic inches, so 16x8x8. I'm not going to get hung up on the math. I was really more concerned with the pairing of the woofer and the tweet I selected, and what issues I would have designing a crossover.
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Old 8th October 2012, 01:32 AM   #27
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Let me clarify that I would do all the math necessary before I started this, its just not a concern at this stage of the design. The box size is well within an acceptable portable package.
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Old 9th October 2012, 11:54 AM   #28
Dissi is offline Dissi  Switzerland
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Hi Basshunter,

I made a simulation of your box, assuming a baffle of 16" x 8" and a volume of 0.17 cu ft. But I failed to find a simple crossover using the two Dayton drivers we are talking about. A crossver frequency of 3.5 kHz is a little bit too high for the woofer, and the tweeter requires a complicated filter.

Therefor I exchanged the tweeter and tried the Vifa BC25SC06-04, which allows a crossover frequency around 3 kHz. Doing so, we have a more relaxed situation and a classic 2nd order crossover works well.

BasshunterSimulation.jpg
CrossoverBasshunter.jpg

Last edited by Dissi; 9th October 2012 at 12:09 PM.
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Old 9th October 2012, 01:32 PM   #29
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The horn idea just using the iPod speaker is not that silly, there's a very clever design using bamboo and its really not bad, all it needs is a small sub
Electricity-free Bamboo Speaker for iPhone 4 by Anatoliy Omelchenko — Kickstarter
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Old 9th October 2012, 02:04 PM   #30
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Quote:
Originally Posted by Dissi View Post
Hi Basshunter,

I made a simulation of your box, assuming a baffle of 16" x 8" and a volume of 0.17 cu ft. But I failed to find a simple crossover using the two Dayton drivers we are talking about. A crossver frequency of 3.5 kHz is a little bit too high for the woofer, and the tweeter requires a complicated filter.

Therefor I exchanged the tweeter and tried the Vifa BC25SC06-04, which allows a crossover frequency around 3 kHz. Doing so, we have a more relaxed situation and a classic 2nd order crossover works well.

Attachment 305467
Attachment 305469
You put a lot of thought into this. The drawings look good to me, and the crossover design is HUGE! Thank you!
I missed the Vifa tweet. It does look better. I was looking at ones 1" or less but this will work.
So how do you think it will sound? This covers 50-20,000 hz. in a small portable box.I have to think it will sound better than a Bose, or the like.
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