Flodstroem
03-14-2005, 07:39 AM
Hello again
Now I have started with my TL (Transmission Line) speaker projekt.
I have choosen a value at a couple of parameters for this type of speaker that I would like to try to reach in the calculations (eg. F3, freq. 20-90 Hz and cone excursion).
First calculations on this type of speaker (the TL) ended up with a to large speaker system for our living room (14-15 cub. feet)
Then I tried the ML TQWT type of speaker. What the heck is that ?
A very simple explanation: itīs kinda combination of a TL and a bass reflex speaker. (design Martin J. King). ML TQWT= Mass Loaded Tapered Qarter Wavelength Tube. In this case it will be a one folded "Tube" (9-10 cub.feet)
The frequency response of that type of speaker seems to suit my porpose with respect to frequency response, and deep bass.
A problem for a novice like me in calculation speaker is that I am not realy sure how to evaluate the plots that came out from this calculations. Trial and error will be very expensive if I had to re-build the cabinets because they will be rather large speakers even though I choose to build a ML TQWT.
If refering to the attached plots I find it rather interesting if looking at the 20 Hz region. F3 is landing on 22-23 Hz and the respons is decent flat up to 90 Hz where the "high bass" will take over. Cone excursion looks fine and also the time delay response.
But Iīm a litle bit worried about the sound pressure level generaly. Is this a bad or a decent plot level (when calculation a ported box (type bass reflex) the SPL is higher upp (ca 95-98 dB) but f3 will be far from 22-23 Hz (also cone excursion at 20 Hz will be worse) :hmm:
The calculations at this stage is in the beginning and Iīm sure it could be done more to this work.
Sorry the attached file is not as clear as it should be, but there is often a problem for me when I choose to work with new programs for free ("Math CAD"), in Virtual PC at a Mac and converting files to .pdf and then try to cut files to under 180 kbits. I lot of steps that could go wrong. :hate-pc:
I would like to hear a comment to this plots (20-90Hz) from the friends at the Forum, I would appreciate that.
Thankīs in advance :wave:
Now I have started with my TL (Transmission Line) speaker projekt.
I have choosen a value at a couple of parameters for this type of speaker that I would like to try to reach in the calculations (eg. F3, freq. 20-90 Hz and cone excursion).
First calculations on this type of speaker (the TL) ended up with a to large speaker system for our living room (14-15 cub. feet)
Then I tried the ML TQWT type of speaker. What the heck is that ?
A very simple explanation: itīs kinda combination of a TL and a bass reflex speaker. (design Martin J. King). ML TQWT= Mass Loaded Tapered Qarter Wavelength Tube. In this case it will be a one folded "Tube" (9-10 cub.feet)
The frequency response of that type of speaker seems to suit my porpose with respect to frequency response, and deep bass.
A problem for a novice like me in calculation speaker is that I am not realy sure how to evaluate the plots that came out from this calculations. Trial and error will be very expensive if I had to re-build the cabinets because they will be rather large speakers even though I choose to build a ML TQWT.
If refering to the attached plots I find it rather interesting if looking at the 20 Hz region. F3 is landing on 22-23 Hz and the respons is decent flat up to 90 Hz where the "high bass" will take over. Cone excursion looks fine and also the time delay response.
But Iīm a litle bit worried about the sound pressure level generaly. Is this a bad or a decent plot level (when calculation a ported box (type bass reflex) the SPL is higher upp (ca 95-98 dB) but f3 will be far from 22-23 Hz (also cone excursion at 20 Hz will be worse) :hmm:
The calculations at this stage is in the beginning and Iīm sure it could be done more to this work.
Sorry the attached file is not as clear as it should be, but there is often a problem for me when I choose to work with new programs for free ("Math CAD"), in Virtual PC at a Mac and converting files to .pdf and then try to cut files to under 180 kbits. I lot of steps that could go wrong. :hate-pc:
I would like to hear a comment to this plots (20-90Hz) from the friends at the Forum, I would appreciate that.
Thankīs in advance :wave: