GM said:
So, ...you didn't designed the xover, and you are considering RC dampers and damping resistors already...?
Greets!
I miss your point. I mean the 8BX already has an XO and the SET's high output impedance will add a broadband hump in the response centered around Fs to help with baffle step loss, while the rolled off LF extension will help blend it to the room somewhat.
GM
I miss your point. I mean the 8BX already has an XO and the SET's high output impedance will add a broadband hump in the response centered around Fs to help with baffle step loss, while the rolled off LF extension will help blend it to the room somewhat.
GM
GM said:
it doesn't have one, ...you have to buy...
...to have some control on the impedance peak and Zmax you might have to shift the resonance upward by a predictable amount, ie. Fb@50 Hz. (gotcha?) Ok, then, aren't you losing the bottom part of the frequencies under 50 Hz?
Inductor said:
As in changing the box properties (or xover?!) ? or am I loosing some, I guess that graph from GM was a TL ?
Only thing I have here is winisd
Gotta grab those martin spreadsheets (and learn how to use them 😀 )
Bruno H.
carcass said:
Any of them, we are only discussing speaker driver. If it pleases you for me it's fine. Is not a bad speaker after all. Not that it's the one I got. I got a plain 10" woofer, and I have another 12" high efficiency with Fs60Hz. It's a PA wide range but this is mounted in a bass horn what is just fine.
The coaxial (Beyma 8"BX) centrality it's a bonus.
carcass said:Only thing I have here is winisd
It's really fine. You play with Xmax at the impedance peak of 50 Hz and see what the maximum power (Wrms) it says it can handle. Since you are not using it all (at full power)... We are talking about a Beyma 8"BX coaxial, you can use it in WinISD. Adjust the vent if you are using it, I am not sure.
Inductor said:
Greets!
OK, but they have one available, so no need to design/build one. Why do I want to control them? I mean the amp's interaction with them is what creates some BSC. The bottom end is filled in by the ML-horn gain.
GM
carcass said:
Greets!
ML-horn:
L = 72.375"
SO = 34.1"^2
SL = 136.4"^2
zdriver = 36.187"
port near/at the bottom
rport = 2"
Lport = 3"
minimal damping to just below the driver for the sim
GM
GM, I see you were here:
http://www.diyaudio.com/forums/showthread.php?threadid=51031
also checking about:
http://www.cognitivevent.com/av_he12.html
(...for people with guts)
I am looking at this two (coaxials):
Selenium Pro Coaxial 12co2p
don't look at the logo, they have the "no logo model" (SLF without the selenium logo print), and
don't look at the dips (freq. output) because it have the wrong xover.
http://www.seleniumloudspeakers.com/site2004/catalogo/pdf/pro_coaxial_12co2p_12co2p-slf_new.pdf
Eminence Beta 12CX
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=290-504&ctab=2#Tabs
http://www.diyaudio.com/forums/showthread.php?threadid=51031
also checking about:
http://www.cognitivevent.com/av_he12.html
(...for people with guts)
I am looking at this two (coaxials):
Selenium Pro Coaxial 12co2p
don't look at the logo, they have the "no logo model" (SLF without the selenium logo print), and
don't look at the dips (freq. output) because it have the wrong xover.
http://www.seleniumloudspeakers.com/site2004/catalogo/pdf/pro_coaxial_12co2p_12co2p-slf_new.pdf
Eminence Beta 12CX
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=290-504&ctab=2#Tabs
Inductor said:
Greets!
It's basically a linear expansion horn, so has a 1/4 WL fundamental with both odd and even harmonics rather than just the odd harmonics of a 1/4 WL pipe (TQWT or ML-TQWT) and why there's so much gain below Fs without the 1/4 WL pipe's HF excessive 'ripple' response.
GM
So, doing a quick comparison of 3 drivers...
[URL=http://img137.imageshack.us/my.php?image=compareps8.jpg]
I get this... although beyma's impressive 30Hz it's SPL doesn't reach too far, am I right choosing another driver then?
Please excuse me for asking this kind of questions, but this DIY world is slowly starting to me.
ps. GM, about your ML-horn, would you be so kind to point me towards some enlightening article(s)/picture(s) about that type of enclosures.
Thanks in advance
[URL=http://img137.imageshack.us/my.php?image=compareps8.jpg]
An externally hosted image should be here but it was not working when we last tested it.
I get this... although beyma's impressive 30Hz it's SPL doesn't reach too far, am I right choosing another driver then?
Please excuse me for asking this kind of questions, but this DIY world is slowly starting to me.
ps. GM, about your ML-horn, would you be so kind to point me towards some enlightening article(s)/picture(s) about that type of enclosures.
Thanks in advance
Greets!
Not necessarily, it depends on many factors, some of which has been mentioned. For sure, if you want a simple rectangular box, then a driver with an Fs around the lowest frequency you want to audibly reproduce is required and ideally you'll want it to have a Qts around 0.35 for use with a SET. Once you move into ML-horns though, your driver options open up a bit.
http://www.quarter-wave.com/
Note that MJK refers to them as ML-TQWT, which actually refers to a reverse tapered pipe, while the ML-horn is a positive taper like his design: http://www.quarter-wave.com/Project02/Project_2_Front.jpg
GM
Not necessarily, it depends on many factors, some of which has been mentioned. For sure, if you want a simple rectangular box, then a driver with an Fs around the lowest frequency you want to audibly reproduce is required and ideally you'll want it to have a Qts around 0.35 for use with a SET. Once you move into ML-horns though, your driver options open up a bit.
http://www.quarter-wave.com/
Note that MJK refers to them as ML-TQWT, which actually refers to a reverse tapered pipe, while the ML-horn is a positive taper like his design: http://www.quarter-wave.com/Project02/Project_2_Front.jpg
GM
Altec 416A TS specs
Does any one have the TS specs for the Altec 416A?
I couldn't find them via google search, or on the GPA site.
As a side note, how much would the specs drift from original in the 30-40 years since they were new?
Thanks,
Paul
Does any one have the TS specs for the Altec 416A?
I couldn't find them via google search, or on the GPA site.
As a side note, how much would the specs drift from original in the 30-40 years since they were new?
Thanks,
Paul
Greets!
From data given me by the local Altec rep and now archived here: http://www.wmeckle.com/ASHLEY/Ashley.htm
21.4 Hz Fs
1042.89 L (36.829313 ft^3) Vas
4.0 Qms
0.292 Qes
0.27213 Qts
12.54 ohms Re
817.2693 cm^2 (126.677"^2) Sd
32.26 cm (12.7") dia.
0.6 mm (0.1524") Xmax
2.5 mH Le
18.01 N/A BL (17.1351 calc'd)
38.6 g Mmd
50.847 g calc'd
1.124E-03 mm/N (1.0878E-03 calc'd)
2.57% ref. eff. (3.373 calc'd)
Note that calc'd values are off enough to make one or more of the measured ones highly suspect, but it's all I have and I was pleased with the results long before I knew how to check them mathmatically, so as always YMMV.
Hard to say, but in theory not much once you loosen up the suspension (assuming the spider is still pliable).
GM
From data given me by the local Altec rep and now archived here: http://www.wmeckle.com/ASHLEY/Ashley.htm
21.4 Hz Fs
1042.89 L (36.829313 ft^3) Vas
4.0 Qms
0.292 Qes
0.27213 Qts
12.54 ohms Re
817.2693 cm^2 (126.677"^2) Sd
32.26 cm (12.7") dia.
0.6 mm (0.1524") Xmax
2.5 mH Le
18.01 N/A BL (17.1351 calc'd)
38.6 g Mmd
50.847 g calc'd
1.124E-03 mm/N (1.0878E-03 calc'd)
2.57% ref. eff. (3.373 calc'd)
Note that calc'd values are off enough to make one or more of the measured ones highly suspect, but it's all I have and I was pleased with the results long before I knew how to check them mathmatically, so as always YMMV.
Hard to say, but in theory not much once you loosen up the suspension (assuming the spider is still pliable).
GM
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