mini el pipe o : Raptor 6 in a tube - diyAudio
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Old 28th April 2010, 10:34 AM   #1
blo06 is offline blo06  France
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Default mini el pipe o : Raptor 6 in a tube

Hi,

I get 2 Raptor 6 and would like to put them in tube to get 2 mini el pipe O.

resonance is 53 Hz so the 1⁄4 wavelength
is 1.55 meter, right ? (it's about 5.18 ft).

the tube will be 5 ft long and 6 in diameter, and the question is :

is the volume ok ? it's 23.8 liter.

Thanks,

Blo

Technical Facts Speakers
Impedance (Z)


Resonant frequency (fs)
53Hz

Max. frequency range
f3-800Hz

Music power
300WMAX

Power rating (P)
100WRMS

SPL (1W/1m)
88dB

Suspension compl. (Cms)
0.38mm/N

Moving mass (Mms)
23g

Mech. Q factor (Qms)
2.2

Electr. Q factor (Qes)
0.43

Total Q factor (Qts)
0.36

Equivalent volume (Vas)
6.9 l

DC resistance (Re)
3.4Ω

Force factor (BxL)
7.6 Tm

Voice coil induct. (Le)
0.6mH

Voice coil diameter
25mm

Voice coil former
KAPTON

Linear excursion (XMAX)
9mm

Eff. cone area (Sd)
113cm2

Magnet weight
850g

Weight
2.4kg
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Old 28th April 2010, 12:11 PM   #2
Volenti is offline Volenti  Australia
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Join Date: Aug 2003
Location: Australia
It needs a longer..pipe o :P

Two meters long to be precise, with a very light stuffing (you'll have to fill to taste here)

Click the image to open in full size.
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Old 28th April 2010, 12:27 PM   #3
blo06 is offline blo06  France
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Hi Volento,

for the length I did : (after NPass but metric)

330m/s / 53Hz = 6.22 m / 4 = 1.55 m

How do you find 2 m ?

Do you have any thought about the volume ?

Blo
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Old 28th April 2010, 02:07 PM   #4
Volenti is offline Volenti  Australia
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Join Date: Aug 2003
Location: Australia
I'm using a mathcad template written by Martin J. King to model your driver in a transmission line, I tried 1.55m initially but it requires both more fill and a carefull application of said fill to not sound boomy, 2m with a little stuffing was a sweet spot I chose from experience that will go lower and be less tempremental to get good results out of. (I make TL enclosures for a living, allbeit for car audio but still)

The volume isn't something I concern my self with so long as it fits where it needs to go and the area of the line isn't too crazy compared to the SD of the driver (1.6:1 in this case being more or less ideal), it's not critical like it is in a vented enclosure.
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Old 28th April 2010, 02:35 PM   #5
blo06 is offline blo06  France
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Thanks for those explanations.

Do you this Raptor 6, and if so, do you think it's a good idea to do such a minipipo ? Or is it a better one ?

Blo
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Old 28th April 2010, 03:25 PM   #6
Volenti is offline Volenti  Australia
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Join Date: Aug 2003
Location: Australia
Quote:
Originally Posted by blo06 View Post
Thanks for those explanations.

Do you this Raptor 6, and if so, do you think it's a good idea to do such a minipipo ? Or is it a better one ?

Blo
I haven't had the opportunity to do any thing with this driver but it appears to be a solid little beasty and a pair should quite enjoyable.
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Old 25th May 2012, 03:19 PM   #7
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Hi all, hi Blo06. 2 years after... Did you made it? How does it sound?
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Old 25th May 2012, 06:53 PM   #8
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by Rascalito View Post
Hi all, .. How does it sound?..
Hi Rascalito,

If ever built the Op suggested pipe would not sound good at all as the pipe volume for this driver would be too large.

Should be at or below 2 x Vas if in a Nd pipe to allow sensible amount of stuffing to cure the very peaked response.

b
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File Type: jpg Raptor-6.JPG (510.1 KB, 102 views)
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Old 25th May 2012, 07:18 PM   #9
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Ok, thanks... Sorry, I'm writing faster that I'm thinking ;o)
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