Help with designing a sonosub

[grogamanda]

Good afternoon all,

I am struggling manfully to work out how to build a sono sub properly.

I want to build a Bosso Raptor System 2 or 3

http://www.bossobass.com/Bossobass.c...20Systems.html

I have 2 drivers - matched :-

Impedance: 8ohms
Power handling: 80W RMS
Frequency range: 25Hz - 4kHz
Sensitivity: 92db/W @ 1m
Voice coil resistance (Re): 7.4ohms
Resonant frequency (fs): 25Hz
Mechanical Q (Qms): 5.262
Electrical Q (Qes): 0.428
Total Q (Qts): 0.396
Equivalent volume (Vas):194l
Cone area: 0.0506m2

I can build them but I am really struggling to accurately calculate the size of the tube needed and the gap needed between the two tubes as the speakers fire AT each other. I have tried sonosub calculator etc but its not designed for this application as such that I can make out.

I will be using one amp to power both drivers 200W RMS into 8ohm

Sonotube diameter is 450mm

Prefer Ported as this is for a Home theatre

Can anyone help? Please?

I want to get this built over the weekend so that I can run a Lord of the Rings marathon next week!!

Kind regards

Richard

[ThomasW]

Dave's (aka Bosso's) subs are not ported they're sealed. They use custom designed and built drivers specific to his cabinet design and electronics

There are 2 drivers in each tube, they're run with a very sophisticated version of a Linkwitz Transform circuit and very high power.

A complete set of T/S parameters is required to properly design a sub.

[grogamanda]

Dave's (aka Bosso's) subs are not ported they're sealed. They use custom designed and built drivers specific to his cabinet design and electronics

There are 2 drivers in each tube, they're run with a very sophisticated version of a Linkwitz Transform circuit and very high power.

A complete set of T/S parameters is required to properly design a sub.

It was more the similarity than the performance - I wont get that great performance out of these drivers but I love the look :-) as does the wife :-) which is a bonus.

Just needed some help on how to deliver such a thing based on those parameters.

Cheers

R

[grogamanda]

Dave's (aka Bosso's) subs are not ported they're sealed. They use custom designed and built drivers specific to his cabinet design and electronics

There are 2 drivers in each tube, they're run with a very sophisticated version of a Linkwitz Transform circuit and very high power.

A complete set of T/S parameters is required to properly design a sub.

It was more the similarity than the performance - I wont get that great performance out of these drivers but I love the look :-) as does the wife :-) which is a bonus.

Just needed some help on how to deliver such a thing based on those parameters.

Cheers

R

[JonMarsh]

You really need to have the driver Fs, and Cms or VAS to get somewhere on calculating the right enclosure volume. The Qts on these drivers is in a somewhat higher range, indicating their most suited to a sealed system. How big depends on the cone mass and suspension compliance. You could search on Madisound for 12" woofers/subwoofers with parameters matching somewhat to the specs you have, then use those characteristics to make a SWAG for the enclosure parameters. Sealed is far less critical for size- ported you really have to have the driver characteristics nailed down to get good results. Also, with just 200W on hand for both drivers, you won't want a small box that requires a Linkwitz transform and EQ to get the LF response- you don't have the power for it.