Hi all
One thing isnt clear
If i use a 15" adire tempest for example,
on 115Litres tuned to 33hz,
Then use Parametric -5db gain,Fc=50hz,Q=0.4 EQ..
this results in a flat response.
BUT transient response must equal what the final FR is yes?
with a flat response i expect good quality bass,not quite overdamped control,but 'okay'
i certainly dont like the underdamped peaky box,which is why i thought about applying EQ.
btw with this alignment it can handle 750watts easily,xmax peak in midbass only 8mm..ofcourse subsonic filtering would be best to keep it safe below 25hz.
---just in theory---
Cheers!
One thing isnt clear
If i use a 15" adire tempest for example,
on 115Litres tuned to 33hz,
Then use Parametric -5db gain,Fc=50hz,Q=0.4 EQ..
this results in a flat response.
BUT transient response must equal what the final FR is yes?
with a flat response i expect good quality bass,not quite overdamped control,but 'okay'
i certainly dont like the underdamped peaky box,which is why i thought about applying EQ.
btw with this alignment it can handle 750watts easily,xmax peak in midbass only 8mm..ofcourse subsonic filtering would be best to keep it safe below 25hz.
---just in theory---
Cheers!
Attachments
I think that because the box is a 4th-order system and you are skewing the frequency response with a different order response, i.e. are not exactly cancelling/moving the poles and zeroes, then the transient response is not properly improved.
However, the bass sounds better because of the reduced amplitude exaggeration.
However, the bass sounds better because of the reduced amplitude exaggeration.
So the ringing, characteristic of poor transient response and higher order box alignments, will be cured by an overdamped electrical filter? This doesn't seem right.sreten said:The transient response will theorectically ~ be the same.
The end result is a FR and TR not normally available from the driver,
but it will be nearly equivalent to another driver with that alignment.
(some minor ripple difference is to be expected)
sreten.
Ah, sorry, I meant the driver ringing (overshoot and recovery) as in impulse response, not the ripple in the FR.sreten said:Well if it wasn't right the Linkwitz Transform would be a non-starter.
sreten.
The Linkwitz Transform also converts the transient response of
an underdamped sealed box to that of the target TR and FR.
The same applies to a second order notch filter applied to an
underdamped 4th order reflex response, both FR and TR.
I don't think it works well in practise due to effects at high levels.
sreten.
an underdamped sealed box to that of the target TR and FR.
The same applies to a second order notch filter applied to an
underdamped 4th order reflex response, both FR and TR.
I don't think it works well in practise due to effects at high levels.
sreten.
sreten said:The Linkwitz Transform also converts the transient response of
an underdamped sealed box to that of the target TR and FR.
The same applies to a second order notch filter applied to an
underdamped 4th order reflex response, both FR and TR.
I don't think it works well in practise due to effects at high levels.
sreten.
the LT or the notch filter doesnt work well at high level?
So in conclusion you wouldnt attempt the tempest with notch filter with port due to nonlinearities and things happening at high spl
eg: port outputs/speaker output nonlinearities and compressions cause more notching than predicted.. etc etc.?
LT + sealed ofcourse is what alot of people do..its not my cup of tea however...
2-4 dpl12s might give me desired output on low tuned boxes(oneday )
eg: port outputs/speaker output nonlinearities and compressions cause more notching than predicted.. etc etc.?
LT + sealed ofcourse is what alot of people do..its not my cup of tea however...
2-4 dpl12s might give me desired output on low tuned boxes(oneday )
Max SPL at 20Hz is a lot healthier with 115L and
20Hz port tuning rather than 115L with 33Hz.
The 33Hz alignment gives very high max SPL 40 to 50Hz,
121dB, but it is dieing below 40Hz, dropping 23dB by 20Hz
to 98 dB, SPL is worse than a 115L sealed box, 102dB.
20Hz gives 118dB maximum but 109dB at 20Hz, 11dB
more, SPL begins drastically falling only below 16Hz.
sreten.
20Hz port tuning rather than 115L with 33Hz.
The 33Hz alignment gives very high max SPL 40 to 50Hz,
121dB, but it is dieing below 40Hz, dropping 23dB by 20Hz
to 98 dB, SPL is worse than a 115L sealed box, 102dB.
20Hz gives 118dB maximum but 109dB at 20Hz, 11dB
more, SPL begins drastically falling only below 16Hz.
sreten.
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