18inch Scoop box Marin Plywood 18mm outer and 20mm inner thickness. JBL clone net.
Driver P180/2242
This 18" Scoop sounded wider and louder at 40HZ than a ported bass reflex 18".
But at 20HZ this scoop just made the ground shake with slow sound. While a ported bass reflex 18 made sound of 20HZ.
Please tell what you think will this be ok 20HZ 30HZ, 40HZ?
Driver P180/2242
This 18" Scoop sounded wider and louder at 40HZ than a ported bass reflex 18".
But at 20HZ this scoop just made the ground shake with slow sound. While a ported bass reflex 18 made sound of 20HZ.
Please tell what you think will this be ok 20HZ 30HZ, 40HZ?
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For either a bass reflex or scoop, below the -3dB point output will go down quickly and excursion will go up. For any driver.
With most people, for home listening levels, that won't matter when using a large driver.
If you like to play it VERY loud, it depends a bit on what equipment you have. Personally, I'd measure the response of the driver in the scoop (using a USB mic and REW), and then use a filter (miniDSP) to apply a highpass.
e.g. If the driver started to roll off under 40Hz, try a highpass filter at 25Hz. But the louder you want it to play, the higher you'll need to set the filter.
This review gives an interesting example (it is a much smaller driver, but the excursion info is still relevant):
Test Bench - Dayton Audio ES180Ti-8 7? High-End Midbass Woofer
The driver is excursion limited, so with no filter, it can play ~5dB louder in a sealed box: a reversal of the conventional wisdom.
"Because the vented box example reached maximum excursion at about 20 Hz, a steep 24 dB/octave high-pass active filter located at about 25 to 30 Hz would increase the power handling and output the vented box example by a substantial margin"
it gave up after
you probably damaged it with the test signal. It just cried enough during this more sensible 115dB test
I just cut open the dust cap and now after moving the cone up and down the bottoming sound has gone it works ok now
Will be buying new woofer as replacement for the broken P.Audio
Can a replaced cone sound as good as the original version?
Dev electronic mumbai is a cheater sells repaired P.Audio as new by a re-cone kit be careful.
@AndrewT
Could be but the seller is faulty. At beginning the Surround was sticky near the belt and making noise so i separated it with a plastic tool
@epa
No did not use HPF. It was a 10db gain 60hz bass hit music track.
Will be buying new woofer as replacement for the broken P.Audio
Can a replaced cone sound as good as the original version?
Dev electronic mumbai is a cheater sells repaired P.Audio as new by a re-cone kit be careful.
@AndrewT
Could be but the seller is faulty. At beginning the Surround was sticky near the belt and making noise so i separated it with a plastic tool
@epa
No did not use HPF. It was a 10db gain 60hz bass hit music track.
True.
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For the working P.Audio 180/2242 in the Electro-Voice T18 clone scoop box i played 45hz 100watt bass hit music and it was very loud for home use. So how much is the max wattage to reach the mechanical limit of my P.Audio 180/2242 in the clone Electro-Voice T18 box?
Are these true:
A 1000watt 18inch driver is 200watt in "Electro-Voice T18 scoop box"
A 1000watt 18inch driver is 500watt in "Ported bass reflex box"
A 1000watt 18inch driver is 900watt in "Sealed box"
Are these true:
A 1000watt 18inch driver is 200watt in "Electro-Voice T18 scoop box"
A 1000watt 18inch driver is 500watt in "Ported bass reflex box"
A 1000watt 18inch driver is 900watt in "Sealed box"
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