hi
another new project coming ... i received another new 10inch subwoofer driver yesterday which currently mounted in an old floorstander box and now still in break in period ... current setup 65L working volume and a 4 inch hole which act as a port and with only hardly 1 inches length ... but this setup does sound nice to me which i liked the hard drum bass around 40Hz to 50Hz region and when driven hard around this region the cone doesnt move much ... but the port was pretty short i believe it might lead to chuffing which something i might need to address soon ...
so i come into mind with suitable replacement port which worked well for my past project that is the 50mm aeroport with 2 huge sized flares ... this aeroport has proofed quite performing well in my past 2 projects ... so around X4 or X5 units of them tuned to the same current frequency will run the show nicely? or i better off going into something upsized port such as a 6 inch UPVC drainpipe corrected to the proper length to the same current tuning frequency? I am redesigning a new box for it
Advices well welcomed as usual ... thanks
another new project coming ... i received another new 10inch subwoofer driver yesterday which currently mounted in an old floorstander box and now still in break in period ... current setup 65L working volume and a 4 inch hole which act as a port and with only hardly 1 inches length ... but this setup does sound nice to me which i liked the hard drum bass around 40Hz to 50Hz region and when driven hard around this region the cone doesnt move much ... but the port was pretty short i believe it might lead to chuffing which something i might need to address soon ...
so i come into mind with suitable replacement port which worked well for my past project that is the 50mm aeroport with 2 huge sized flares ... this aeroport has proofed quite performing well in my past 2 projects ... so around X4 or X5 units of them tuned to the same current frequency will run the show nicely? or i better off going into something upsized port such as a 6 inch UPVC drainpipe corrected to the proper length to the same current tuning frequency? I am redesigning a new box for it
Advices well welcomed as usual ... thanks
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you want port velocity around 18 m/s
with a dual flare up to 22 to 26 m/s
assuming your actually using around 80 to 150 watts
should be fine with 2x 50mm ports.
Of course it is easier to run the numbers in simulation
and check the port velocity
with the current setup, yes its likely for a single small hole
to chuff around 10 to 12 m/s
not really about length, its the velocity of the port
and the smaller the port area the higher the velocity
with a dual flare up to 22 to 26 m/s
assuming your actually using around 80 to 150 watts
should be fine with 2x 50mm ports.
Of course it is easier to run the numbers in simulation
and check the port velocity
with the current setup, yes its likely for a single small hole
to chuff around 10 to 12 m/s
not really about length, its the velocity of the port
and the smaller the port area the higher the velocity
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The woofer itself can take up to 200W ... it is rated RMS200W and Peak 300W while my TDA8950 could produce about 250W rms into 4ohms ... so i guess 3 units of 50mm double flare ports should do fine ... i havent try a single 6inch port with double flares i wonder it would be too big for a 10inch woofer?
6" would be very nice as far as keeping velocity low.
almost 2 big
Not sure what your tuning is
but to be around 30 to 35 Hz the length would be around
48 to 80 cm
So as long as that fits in the box in a convenient location.
Its the main reason why dual flares really help with reducing chuffing
but still using a smaller port area.
Sometimes to get things to fit in the box you have to use smaller ports.
Ports with large openings need to be very long in length.
often exceeding the length of the box.
With 2x or even 4x small ports
the velocity is good
and the needed lengths are much shorter.
You can play by ear, the listening test is always the final approval.
But as far as getting a very defined answer, you should maybe
have fun with simulation software. So you will
know exactly what the port velocity, required tuning length and power handling is
larger box can be good for low extension, but it reduces power handling.
So yes you driver might have a thermal rating of 200 watts.
But it might reach Xmax or 10% distortion at around 90 to 150 watts.
Something the model will show you. Xmax being how many mm the driver can
move forward and back before reaching 10% distortion
almost 2 big
Not sure what your tuning is
but to be around 30 to 35 Hz the length would be around
48 to 80 cm
So as long as that fits in the box in a convenient location.
Its the main reason why dual flares really help with reducing chuffing
but still using a smaller port area.
Sometimes to get things to fit in the box you have to use smaller ports.
Ports with large openings need to be very long in length.
often exceeding the length of the box.
With 2x or even 4x small ports
the velocity is good
and the needed lengths are much shorter.
You can play by ear, the listening test is always the final approval.
But as far as getting a very defined answer, you should maybe
have fun with simulation software. So you will
know exactly what the port velocity, required tuning length and power handling is
larger box can be good for low extension, but it reduces power handling.
So yes you driver might have a thermal rating of 200 watts.
But it might reach Xmax or 10% distortion at around 90 to 150 watts.
Something the model will show you. Xmax being how many mm the driver can
move forward and back before reaching 10% distortion
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