I have eyed of these 3 inch drivers at jaycar...
Shielded 3" 15W 8-Ohm Full Range Speaker - Jaycar Electronics
They come with full T/S params, but of the few speaker design programs on the internet i have found, one came out at negative 2.6 litres.. the other one came out at over 146 litres... im confused! it seems something to do with Qts messes up a lot of the calculators. Being above .707
There doesnt seem to be many topics on diyaudio for computer satellite speakers, they need to be small, and not a huge bass response because i have a sub to take care of that.
I just want accuracy for positional audio in games. At the moment im using sony xplode 4 inch car speakers with a coaxial mylar tweeter. Tweeter is good actually, but they are very directional and any off axis listening has a marked degradation in high frequency quality.
The positional audio is what im focused on, i have already got mounts set up for good positional accuracy around my chair, and i have a twin 8 inch sealed sub already so that these satellite speakers dont really have to go below 100hz.
Those 3 inch speakers i have linked seem ideal for my use, but im having a terrible problem getting a decent enclosure design. I want to go sealed btw.
And if it matters, they are being powered of a low voltage modified LM3875T system, rails at 25 volts instead of the normal 37 volts. This was done because the xplod car speakers are 4 ohm and i didnt want to hit the fairly sharp SPIKE protection in the lm3875 chips with the higher rails.
i have fairly decent wood workings skills for flat panel MDF work, but i was also thinking of using thick PVC stormwater/plumbing tubing for these.
Or even something like ceramic flower pots or bowls or something, i am keen to try something unique!
They do need to be small though. Makes it hard i know.
Shielded 3" 15W 8-Ohm Full Range Speaker - Jaycar Electronics
They come with full T/S params, but of the few speaker design programs on the internet i have found, one came out at negative 2.6 litres.. the other one came out at over 146 litres... im confused! it seems something to do with Qts messes up a lot of the calculators. Being above .707
There doesnt seem to be many topics on diyaudio for computer satellite speakers, they need to be small, and not a huge bass response because i have a sub to take care of that.
I just want accuracy for positional audio in games. At the moment im using sony xplode 4 inch car speakers with a coaxial mylar tweeter. Tweeter is good actually, but they are very directional and any off axis listening has a marked degradation in high frequency quality.
The positional audio is what im focused on, i have already got mounts set up for good positional accuracy around my chair, and i have a twin 8 inch sealed sub already so that these satellite speakers dont really have to go below 100hz.
Those 3 inch speakers i have linked seem ideal for my use, but im having a terrible problem getting a decent enclosure design. I want to go sealed btw.
And if it matters, they are being powered of a low voltage modified LM3875T system, rails at 25 volts instead of the normal 37 volts. This was done because the xplod car speakers are 4 ohm and i didnt want to hit the fairly sharp SPIKE protection in the lm3875 chips with the higher rails.
i have fairly decent wood workings skills for flat panel MDF work, but i was also thinking of using thick PVC stormwater/plumbing tubing for these.
Or even something like ceramic flower pots or bowls or something, i am keen to try something unique!
They do need to be small though. Makes it hard i know.
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Try this to calc your box volume. Because of the rather high Qts, I am guessing they will not be compact, probably around 4 liters. Actually, I guessed right (assuming driver takes up about 100 cc volume) - the calculator says 4.1 liter with 89 Hz freq. Ideal dim is 6.3 in wide, 3.9 in deep, 10.2 in tall.
mh-audio.nl - Home
mh-audio.nl - Home
I have a pair of these that I use in a portable boom box system in 3 liter enclosures. I find they sound best when paired with a tweeter crossed around 5 khz.
An externally hosted image should be here but it was not working when we last tested it.
3 liters! damn.
if i go smaller in box size, whats going to happen? resonance? low frequency cut off?
if i go smaller in box size, whats going to happen? resonance? low frequency cut off?
If you want to go smaller, you may want to try a "Boffle" (a highly vented box designed to simulate an infinite size box).
http://www.diyaudio.com/forums/full-range/236729-silencer-speaker-baffle.html#post3507792
http://www.diyaudio.com/forums/full-range/236729-silencer-speaker-baffle.html#post3507792
An externally hosted image should be here but it was not working when we last tested it.
The blue line is a 3 liter box and the red line is a 9 liter box. You don't gain much low frequency extension by going with a larger box.
I use 5 of these for a computer gaming/mini-surround system: http://medleysmusings.com/aura-sound-ns3-193-8a1/
The warnings about the notch and off-axis response are quite true, but apart from that I can't figure out much else wrong with these. They are not the best for music but compared to what else is available out there, I'm quite pleased.
I have them in tiny little 1L sealed and stuffed boxes and cut them off at about 125Hz in the soundcard crossover - not the best possible configuration, but sufficient for the purpose. They can really push out lots of volume, though there is still some excursion limitation at the very end of the range if you want to hear it. And you could possibly get away without a tweeter at all.
Note that the back of these tiny drivers are terrible for airflow and get worse when you put them in a box with thick walls. I chose to stuff the box really tight to muffle the backwave so don't have much of an issue, but I guess ported enclosures will have it worse.
The warnings about the notch and off-axis response are quite true, but apart from that I can't figure out much else wrong with these. They are not the best for music but compared to what else is available out there, I'm quite pleased.
I have them in tiny little 1L sealed and stuffed boxes and cut them off at about 125Hz in the soundcard crossover - not the best possible configuration, but sufficient for the purpose. They can really push out lots of volume, though there is still some excursion limitation at the very end of the range if you want to hear it. And you could possibly get away without a tweeter at all.
Note that the back of these tiny drivers are terrible for airflow and get worse when you put them in a box with thick walls. I chose to stuff the box really tight to muffle the backwave so don't have much of an issue, but I guess ported enclosures will have it worse.
Fostex FF85wk is my goto for a small speaker. In the uFonkenWK (nominal 2 L) they just reach 100 Hz
(here with the older FF85k)
dave
(here with the older FF85k)
dave
im using Tangband W3 1285SG, or will be when i finish the blanda bowl build im halfway thru. From TS measures they will reach around 100-110 hz, in 0.5 to 1 litre. Expensive neo design tho, but i find them very accurate. MarkAudio A6 are likely very good in a similar application. But the higher Qts in your example isnt helpful in a satellite app, in my opinion.
Darcher in Aus has a few drivers that might work... And you can avoid expensive shipping from O.S.
DIY Drivers
Hey TheDoc, what's that software you are using?
Dean
DIY Drivers
Hey TheDoc, what's that software you are using?
Dean
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