Could i build a backload horn whith Axiom10

[santitrucco]

I have a pair of Goodmans Axiom 10 Speakers..

I would like to build a backloaded horn for this speakers..

Is a good option ?

i do not know thiell small parameters

Somebody could be help me ?

thanks friends

santiago

 

[GM]

Based on the factory recommended reflex cab, it can be BLH loaded, but with no specs..........

GM

 

[santitrucco]

I have a pair New never used , and some friends believe that can do the best in Back loaded horn , i am building a horn loaded , but i do not know the results

thanks a lot GM

 

[xrk971]

Do you have means of measuring TS params? I hear it can be done with pc sound card and 10 ohm resistor and wiring.

 

[santitrucco]

i have Praxis from Liberty Instruments , but in this moment a friend of my is utilizing the Praxis

 

[xrk971]

An externally hosted image should be here but it was not working when we last tested it.

http://m307.photobucket.com/albumview/albums/AudioVoice/09.jpg.html

 

[santitrucco]

good , thanks

 

[GM]

i have Praxis from Liberty Instruments , but in this moment a friend of my is utilizing the Praxis

Then you can measure T/S specs.

GM

 

[zelgall]

I have a pair of twinaxiom 10's that I can measure tomorrow. They're basically the same but different vintage and they have a small whizzer. It should be close. I wouldn't think that it would change much on the box side. The whizzer is about 3/4" long (or deep) and of relatively small diameter.

 

[zelgall]

Here's two Goodmans twinaxiom 10's
unit 1
Buffer[1] Vas Ver 7.01
Completed: Thu Apr 25 17:57:27 2013
Drive level 100.000% [3.615 mA]
Sine,LoZP(LV/LA)->Vas,21 pts
;------------------------------------------------------------------
Re = 13.7772 ohms
Fs = 51.7573 Hz
Zmax = 54.5619 ohms
Qes = 1.9372
Qms = 5.7348
Qts = 1.4481
Le = 0.5175 mH (at 1 kHz)
Diam = 222.2500 mm ( 8.7500 in )
Sd = 38794.7895 mm^2( 60.1320 in^2)
Vas = 126.3630 L ( 4.4625 ft^3)
BL = 6.0829 N/A
Mms = 15.9989 g
Cms = 591.0287 uM/N
Kms = 1691.9651 N/M
Rms = 0.9072 R mechanical
Efficiency = 0.8498 %
Sensitivity= 91.3111 dB @1W/1m
Sensitivity= 88.9504 dB @2.83Vrms/1m
Krm = 52.299E-06 ohms Freq dependent resistance
Erm = 1.075E+00 Rem=Krm*(2*pi*f)^Erm
Kxm = 6.182E-03 Henries Freq dependent reactance
Exm = 721.330E-03 Xem=Kxm*(2*pi*f)^Exm
;------------------------------------------------------------------
Ftest = 34.035 Hz
Ftest/Fms = 0.6576
Test Mass used = 21.0000 g (Equal to 4.2 nickels)
Test Mass (Ft=Fms*0.90) = 3.753 g (Add -17.247g for Ft=46.582)
Test Mass (Ft=Fms*0.75) = 12.444 g (Add -8.556g for Ft=38.818)

unit 2
Buffer[1] Vas Ver 7.01
Completed: Thu Apr 25 18:23:33 2013
Drive level 100.000% [3.616 mA]
Sine,LoZP(LV/LA)->Vas,22 pts
;------------------------------------------------------------------
Re = 13.9780 ohms
Fs = 55.2288 Hz
Zmax = 55.8164 ohms
Qes = 1.9612
Qms = 5.8701
Qts = 1.4700
Le = 0.5414 mH (at 1 kHz)
Diam = 222.2500 mm ( 8.7500 in )
Sd = 38794.7895 mm^2( 60.1320 in^2)
Vas = 124.2467 L ( 4.3877 ft^3)
BL = 5.9450 N/A
Mms = 14.2901 g
Cms = 581.1303 uM/N
Kms = 1720.7844 N/M
Rms = 0.8448 R mechanical
Efficiency = 1.0028 %
Sensitivity= 92.0302 dB @1W/1m
Sensitivity= 89.6066 dB @2.83Vrms/1m
Krm = 15.213E-06 ohms Freq dependent resistance
Erm = 1.183E+00 Rem=Krm*(2*pi*f)^Erm
Kxm = 6.772E-03 Henries Freq dependent reactance
Exm = 715.802E-03 Xem=Kxm*(2*pi*f)^Exm
;------------------------------------------------------------------
Ftest = 35.144 Hz
Ftest/Fms = 0.6363
Test Mass used = 21.0000 g (Equal to 4.2 nickels)
Test Mass (Ft=Fms*0.90) = 3.352 g (Add -17.648g for Ft=49.706)
Test Mass (Ft=Fms*0.75) = 11.115 g (Add -9.885g for Ft=41.422)

 

[planet10]

I recognize that data format. Woofer Tester 2.

The high Qt causes some issues with putting them in a horn.

dave

 

[zelgall]

WT 2 - correct! Latest software from Smith and Larson. Fast and easy.

 

[planet10]

Not really that fast. A very well thot out algorithm for extracting T/S parameters. After LEAP & LMS (what the factories use) i'd say it gives the most usful results. The UI is not very good, and i'm runningiy in Windows XT which has crap for a UI.

dave

 

[santitrucco]

Dave thanks a lot , what do you thing ?
Bass reflex is a good option for the Axioms 10 ?

 

[santitrucco]

because fs/qes 52/1,93 would be EBP 26 , ideal paramethers for Sealed box ?

 

[xrk971]

Very nice measurements but with a Qts of about 1.5 I think it is suited for open baffle and not a horn. Are you really stuck on using it in a BLH ?

 

[santitrucco]

really i do not know what box build with these Axiom 10..

 

[xrk971]

Well, as open baffle is best suited, a flat board is the best 'box'. A Boffle may also work well and is box shaped.

 

[planet10]

Ideally you want a box that will lower the Qt. Limits you to some sort of open back box (OBish, Boffle) or as a big a box as you can live with and use lots of damping or some sort of electronic filter.

dave

 

[santitrucco]

maybe a 100 liters sealed box ?