gotta try setting up a photo hosting..
Houston, we've got a problem....
Hello,
testing my speakers I found them a little bass-shy, thing that I didn't expect at all in a TL with a dual woofer.
So I started investigating and set-up a Speaker Workshop testing jig.
The first surprise was the impedance measurement: the "nominal" fs of the drivers is 37 Hz, altough a more realistic value seems in the 40-45 Hz range.
The drivers installed in the enclosure gave this curve: I am a bit puzzled... 67 Hz? Where does this come from?
Any ideas?
Cheers
Andrea
Hello,
testing my speakers I found them a little bass-shy, thing that I didn't expect at all in a TL with a dual woofer.
So I started investigating and set-up a Speaker Workshop testing jig.
The first surprise was the impedance measurement: the "nominal" fs of the drivers is 37 Hz, altough a more realistic value seems in the 40-45 Hz range.
The drivers installed in the enclosure gave this curve: I am a bit puzzled... 67 Hz? Where does this come from?
Any ideas?
Cheers
Andrea
Attachments
azira said:
I tried removing the stuffing from the rear chamber and now the bass seems more present, however the impedance peak stays there.
In addition the midrange response now seems more coloured...
The funny thing is that the stuffing has been made exactly as the instructions of the TL6 kit (that inspired my job) suggested.
What else should I do?
Cheers
Andrea
Attachments
Hi Andrea
Try with removing all stuffing from chamber behind drivers, just cover inner walls with heavy damping, like green felt mat for carfloors or such, to eliminate midrange reflexes. Then play it, loudly, for a while see if drivers "break in" after a few days.
Stuffing of a tl may be troubblesome and its easy to get to much "blockage" of the pipe and then it wont work as a tl at all.
Try with removing all stuffing from chamber behind drivers, just cover inner walls with heavy damping, like green felt mat for carfloors or such, to eliminate midrange reflexes. Then play it, loudly, for a while see if drivers "break in" after a few days.
Stuffing of a tl may be troubblesome and its easy to get to much "blockage" of the pipe and then it wont work as a tl at all.
ingvar ahlberg said:
Martin & George's parallel TL models have exploded a lot of TL myths... a very rough rule of thumb guideline is that the cross-section (at least at the start) should be 3 x Sd. This is very rough because the actalu cross-section has nothing to do with Sd, but is related to Vas.
dave
Dave!
Took a glance at Your impressive homepage, will keep a lower profile on this subject, seems to be a lot i did´nt know. Will read all there is on this site thou, but maybe You could give some guidance, i use a pair of RCF L12P48 in closed 130 l cabinets. Very good but powercraving bottom end, linear to about 20Hz in our musicroom. These drivers were regarded as very suitable for tl but i´ve never tried. Since we replaced the Schmacks houses we´ve gotten used to the extra space so i would like to stay below 500l per cabinet.
Took a glance at Your impressive homepage, will keep a lower profile on this subject, seems to be a lot i did´nt know. Will read all there is on this site thou, but maybe You could give some guidance, i use a pair of RCF L12P48 in closed 130 l cabinets. Very good but powercraving bottom end, linear to about 20Hz in our musicroom. These drivers were regarded as very suitable for tl but i´ve never tried. Since we replaced the Schmacks houses we´ve gotten used to the extra space so i would like to stay below 500l per cabinet.
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