Hello,
I have built a vented enclosure for the woofer I was talking about in my recent post, it sounds fantastic, even under 40hz but I am not loading it with full power.
The box is about 350l + interior parts. I am now experimenting with bottles of water but there is a drop at 36Hz. The rest sounds very nicely.
At first the box was about 315 l and then it had a drop from 48-60Hz. Now thats fine..
The port is tuned to 25,6 Hz
fs 28.2
re 5,2
D 338mm
qts 0,39
qms 5,47
qes 0,42
mms 106
bl 15
vas 330
cms 0,29
l1k 1,35
Rms 3,43
Sd 896
For how much should I increase or decrease if this happens? I mean Could one liter or half a liter make a difference? or should I just move by 5 liters +5 +5...
I have built a vented enclosure for the woofer I was talking about in my recent post, it sounds fantastic, even under 40hz but I am not loading it with full power.
The box is about 350l + interior parts. I am now experimenting with bottles of water but there is a drop at 36Hz. The rest sounds very nicely.
At first the box was about 315 l and then it had a drop from 48-60Hz. Now thats fine..
The port is tuned to 25,6 Hz
fs 28.2
re 5,2
D 338mm
qts 0,39
qms 5,47
qes 0,42
mms 106
bl 15
vas 330
cms 0,29
l1k 1,35
Rms 3,43
Sd 896
For how much should I increase or decrease if this happens? I mean Could one liter or half a liter make a difference? or should I just move by 5 liters +5 +5...
Can you measure the impedance curve, like with DATS or something.
Comparing that with a simulation will tell allot about what is happening including the resonance and if there are leaks at joints messing things up.
Dave
Comparing that with a simulation will tell allot about what is happening including the resonance and if there are leaks at joints messing things up.
Dave
Hi,
Changing a 315L box to 350L wont change anything much
with that driver, and certainly won't change 48-60Hz to
36Hz in any sensible reality, very poor measurements.
Room modes are likely the issue.
rgds, sreten.
Changing a 315L box to 350L wont change anything much
with that driver, and certainly won't change 48-60Hz to
36Hz in any sensible reality, very poor measurements.
Room modes are likely the issue.
rgds, sreten.
Yes it was the room.
I don't have the tools to measure the curve, the last time I tried to measure the ts parameters for a woofer they turned out different every time with a different weight and they were not usable at all.
Today I sorted everything out by using a computer based equaliser. The woofer sounds nice but it works only on low power. Otherwise it gives distortion.
But it is still a kickin feeling to hear and feel a self built audio system
I love this job
By the way what setup do you use for measuring ts parameters?
I don't have the tools to measure the curve, the last time I tried to measure the ts parameters for a woofer they turned out different every time with a different weight and they were not usable at all.
Today I sorted everything out by using a computer based equaliser. The woofer sounds nice but it works only on low power. Otherwise it gives distortion.
But it is still a kickin feeling to hear and feel a self built audio system
I love this job
By the way what setup do you use for measuring ts parameters?
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