[noob] Looking to build a really, really small sub

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Hey,

My brain is cooking at the moment. Have to get some idea's out.
I'm "building" an ultra small recording studio monitor using Raal Ribbon and dual Peerless 830856 with passive radiators.

The concept is small and portable. So I want the sub to have a really small footprint. Money is sort of no object.
Sub does not need to play loud. Freq's should be 30-100 to 150 (haven't decided yet). Sound should be very neutral, but on the 'tight' side.

I'll be using a modified DCX2496 to start with. Amplifiers will be www.coldamp.com


Woofers that tickles my mind:

Scan 23W with passive radiator http://www.tymphany.com/datasheet/printview.php?id=107

Peerless XXL 10" with passive radiator http://www.tymphany.com/datasheet/printview.php?id=27

2 x Tangband W6-1139 Sl http://www.tb-speaker.com/detail/1230_04/w6-1139si.htm

TC Sound 10-OEM http://www.tcsounds.com/forums/index.php?showtopic=1013

All inputs are highly appreciated!!


In the studio we are using FOCAL speakers SM8 & SM11. Both uses passive radiators, Class-D amps and they sound gorgeous.

Cheers,
Lindell
 
Lindell,

+1 on the Peerless XLS. based on simulations, it performes very well in a small box with a PR. I am busy planing and doing some research befor i buy the XLS12+PR.
I will probbly go with 40-45L internal volume, with either 600-625g total mass on the PR (adding 200g or so). It will do 20Hz@100dB according to WinISD Pro.

Befor you buy anything, find as much info as you can on the wanted sub :) (I made the mistake when I built my projector, did not do enough research, i bought a cr@p LCD, with low rez 320x240)

David
 
tang band makes some really small woofers down to 5 1/4", but they're extremely inefficient.

if you want to get sub bass out of a small enclosure, one way to do it would be to just amplify the heck out of a small woofer that can take higher power.

you might want to look into 8" auto woofers. alot of those are designed to work as subs in small enclosures.

you can get decent bass out of small woofers if you drive them hard enough. i was surprised at just how much bass my little mission 2 ways could put out even with the ports plugged driven by my 100w reciever. i never push my system hard except that one time when a neighbor was being a pain.

if you had a nice 8", you could do alot better.

adire makes a 6 1/2" driver i've heard people talk about as being good for small subs. i think someone else had mentioned them here.
 
Ok, so I just placed on order for two Tang Band 6,5" woofers.

Looks like I'll go with a 15 liter box tuned to 38Hz. I'm using WinISD to get these figures. It will not play straight to 30Hz, but more like 35Hz -3db. Fair enough for the system.


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The cabinet design will be something really crazy.... :D
 
Dr.EM said:
Perhaps an electronically equalised design would fit the bill? Take a look here:

http://sound.westhost.com/project48.htm

Should reach 30Hz in your box size requirements and the cold amps can supply enough power to get it working well I reckon
:)

This design is based on the principal that this particular woofer design has pushed the resonate point well above the actual crossover frequency and now your using the sloped circuit to pull everything back to flat below resonance (12db per octave speaker drop below f/s and 12db circuit att.)

This is a superior design IMO

This might not work properly with the peerless arrangement

Regards
David
 
kinda late in the game but if I were going to build a micro-sub with good performance that had to be semi-portable I'd:

Use Neodymium magnet drivers (like the TB 6.5 and others)

Use a small box with multiple drivers (small box means less need for bracing large panels)

Use a linkwitz-transform in addition to a nice compact Tripath TAA4100 based amp and switching power supply at 12 or 24V depending on the impedance.

If you want louder, just add pairs of drivers.
 
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