Danley TH-221 drawings ?

[matsj]

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

 

[NEO Dan]

Just go buy some if that's what you want.

 

[m R g S r]

I think I saw a post from Ivan saying that one of these will beat 4 TH118's down below 40...

 

[matsj]

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

 

[NEO Dan]

Danley can provide cabinets in furniture grade finish.

 

[Djim]

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

Hi Matsj,

I think Danley Sound Labs are distributed by Frederik Rosenkjærin in Denmark

 

[tb46]

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,

 

[matsj]

Email is sent to Danley and i have to wait and see what they says.


mats

 

[m R g S r]

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!!

 

[weltersys]

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!!

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

 

[Djim]

The 103 dB one watt one meter sensitivity with response down to 20 Hz is impressive even for a cabinet of that size.

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.

 

[NEO Dan]

I think the standard at Danley is 28.3v/10m and this cab is 2Ω nominal making this a 4w/1m equivalent...

 

[weltersys]

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.

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.

 

[Djim]

Hi Dan,

Minimum impedance is much closer to 1.65 Ohm than 2 Ohm

 

[weltersys]

Hi Dan,

Minimum impedance is much closer to 1.65 Ohm than 2 Ohm

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

 

[NEO Dan]

Hi Dan,
Minimum impedance is much closer to 1.65 Ohm than 2 Ohm

Yes, everything has a minimum impedance. I'm not worried about it, are you?

 

[Djim]

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?

 

[NEO Dan]

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...

 

[Dag Johansen]

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.

Word!
Its just confusing!

Dag

 

[Dag Johansen]

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