In a near future i´m moving to a new place and want to build new subs for my HT. I have an idea about Tom Danleys TH-221. Have someone copied these or have drawings ? All info is interested.
mats
mats
Neo Dan: i'm not sure about buying them in the states. They aren't cheap and shipping to Sweden costs alot.
And i want my own look at the cabinets. Not the black PA look.
Mats
And i want my own look at the cabinets. Not the black PA look.
Mats
Hi matsj,
Well, at least we should offer something to read. It's not like this area has never been talked about, maybe start here:
http://www.diyaudio.com/forums/subwoofers/164567-riccis-dual-b-c-21sw152-build-thread.html
and go on to:
Danley's new monster... - AVS Forum
The AVS Forum thread has a great deal of information freely offered by the good people of DSL. Bye the way, they also offer extensive information on this as well as their other subs-on their website:
DANLEY | TAPPED HORN SUBWOOFER
And as you're saying "subs" I would recommend structural reinforcements for the "new place".
Regards,
Well, at least we should offer something to read. It's not like this area has never been talked about, maybe start here:
http://www.diyaudio.com/forums/subwoofers/164567-riccis-dual-b-c-21sw152-build-thread.html
and go on to:
Danley's new monster... - AVS Forum
The AVS Forum thread has a great deal of information freely offered by the good people of DSL. Bye the way, they also offer extensive information on this as well as their other subs-on their website:
DANLEY | TAPPED HORN SUBWOOFER
And as you're saying "subs" I would recommend structural reinforcements for the "new place".
Regards,
I'm sorry I had it wrong. He said the DBH218LC would beat 4 TH118's down low.
The TH221 will beat 4 TH50's down low. Wow!!
The TH221 will beat 4 TH50's down low. Wow!!
Adjusted to one meter the TH-50 is rated at 124 dB at 22 Hz, 132 dB at 63 Hz.
TH-221 is 138 dB, 145 dB above 78 Hz.
The TH-221 is about 8 dB down at 20 Hz from 40 Hz, the TH-50 about 4 dB down, four TH-50 may have slightly more output at 20 Hz, while the TH-221 would have far more upper output.
There is an “economy of scale” when cabinets using 21” drivers are built as large as the TH-221 (60 x 60 x 28 inches, 58.33 cubic feet), which though just a bit larger than two TH-50, can put out similar level to four.
The 103 dB one watt one meter sensitivity with response down to 20 Hz is impressive even for a cabinet of that size.
That said, a pair of Josh Ricci’s Gjallerhorn (using an 18” driver) would be very close in output to the TH-221 using slightly less volume, 45 x45 x24 inches, 28.125 cubic feet x 2= 56.25 cubic feet.
A pair at one meter would do at least 134 dB at 20 Hz, 140.4 at 40 Hz, slightly more 20 Hz, slightly less 40 Hz than the TH-221.
http://www.diyaudio.com/forums/subwoofers/189784-gjallerhorn.html
The Gjallerhorn would be a good choice if response similar to the TH-221 is desired, especially if portability is a factor.
The sketch below shows one possible fold pattern that would fit in the dimensions of the TH-221 and achieve a similar response.
Art Welter
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Hi Art,
Sensitivity at what? This way it is an empty word... recalculate it to 1w/1m in 2Pi and you will see the sensitivity figure in the normal context.
I think the standard at Danley is 28.3v/10m and this cab is 2Ω nominal making this a 4w/1m equivalent...
DSL rates the two ohm TH-221 at 109 dB (28.3v @10 meter half space, referenced to 2.83V at 1 meter) I simply deducted 6 dB (recalculated ;^) from that figure to account for the sensitivity at one watt one meter.
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Only below 20 Hz, where DSL recommends a 20Hz BW 24 HP.
If the HP is employed, the lower impedance should not be a problem with a good 2 ohm rated amp.
The IEC standard (IEC60268-3) allows any impedance above the rated value, but limits the impedance below. It does not allow the rated impedance to fall below the 80 % of the nominal value at any frequency down to and including DC.
1.65 ohms is 82.5% of 2 😀.
Looks like Ivan took some on line chats we had to heart.
Art
Hi Dan and Art,
Dan I'm not worried but most people don't seem to realise that 2,83V/m is not the same as 1w/1m.
Art, this driver is an example of a driver that drops its minimum impedance under high power. Btw most modern 21"or larger do give a different impedance plot between low current measurements and high current measurements. Any idea what throat opening he is using in this cab?
Dan I'm not worried but most people don't seem to realise that 2,83V/m is not the same as 1w/1m.
Art, this driver is an example of a driver that drops its minimum impedance under high power. Btw most modern 21"or larger do give a different impedance plot between low current measurements and high current measurements. Any idea what throat opening he is using in this cab?
I am aware of ZERO speakers measured at 1w/1m, I've never seen an actual plot. IMO the 1w folks around here seem to be working toward a current drive based measurement and IMO it's of very limited value.
Below are 2 1w plots, please comment on what represents 1w to you...
Below are 2 1w plots, please comment on what represents 1w to you...
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And while we are at it: its confusing when people show their new Hornresp simulations with 19,2, 27 or 35 volts or whatever.
If we all could keep it at 2,83 volt it will be a lot easier to compare designs.
Preferably in 2pi as most of us cant fly subs!😛
Dag
If we all could keep it at 2,83 volt it will be a lot easier to compare designs.
Preferably in 2pi as most of us cant fly subs!😛
Dag
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