Dayton Woofer Tester?

ThyDntWntMusic · 30th March 2011, 11:20 PM

just wondering if anyone knows.

if I use this to measure the specs of a driver thats already mounted in a box, will this give me an accurate impedance graph of what the amplifier would see at certain frequencies when playing music?

Brian Steele · 31st March 2011, 12:01 AM

Quote:

Originally Posted by ThyDntWntMusic

just wondering if anyone knows.

if I use this to measure the specs of a driver thats already mounted in a box, will this give me an accurate impedance graph of what the amplifier would see at certain frequencies when playing music?

Just use the "Impedance Sweep" function to get what you're looking for.

badman · 31st March 2011, 12:03 AM

Yup, the in-box measure tells you what you need to know from an impedance standpoint, and you can use the volume of the box (if it's small relative to the Vas of the driver) to calculate the Vas/Efficiency of the driver for modeling purposes, by comparing to a free-air sweep.

ThyDntWntMusic · 31st March 2011, 12:05 AM

all I need to know is the in box impedance curve so I know if it'll be ok to load the amp down to a nominal 0.25ohm

OscarS · 31st March 2011, 01:29 AM

yup it will do that very quickly

ThyDntWntMusic · 31st March 2011, 01:50 AM

properly? and accurately?

what if its 16 woofers?

ThyDntWntMusic · 31st March 2011, 02:26 AM

thing is, every time I do an impedance sweep, I get massively varying results.

ranging from peaks to about 5 ohms, right up to 20 ohms!

ThyDntWntMusic · 31st March 2011, 10:01 PM

also if I use it to measure the TS specs, mainly just to find the resonant frequency of the box, I get results between 24 and 28Hz... and it'll vary every time.

revboden · 31st March 2011, 10:12 PM

Are you standing in front of the driver or walking around the driver when testing? if so don't. Anything in front or behind the driver that will reflect sound will affect the results.

ThyDntWntMusic · 31st March 2011, 10:20 PM

the box is in a car, repeat tests with the doors shut result in varying results...

I am however in the car with the woofers...

30th March 2011, 11:20 PM	#1
ThyDntWntMusic diyAudio Member Join Date: Feb 2008	Dayton Woofer Tester? just wondering if anyone knows. if I use this to measure the specs of a driver thats already mounted in a box, will this give me an accurate impedance graph of what the amplifier would see at certain frequencies when playing music?

31st March 2011, 12:03 AM	#3
badman Custom Title diyAudio Member Join Date: Sep 2003 Location: Sunny Tustin, SoCal	Yup, the in-box measure tells you what you need to know from an impedance standpoint, and you can use the volume of the box (if it's small relative to the Vas of the driver) to calculate the Vas/Efficiency of the driver for modeling purposes, by comparing to a free-air sweep. __________________ I write for www.enjoythemusic.com in the DIY section. You may find yourself getting a preview of a project in-progress. Be warned!

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31st March 2011, 12:05 AM	#4
ThyDntWntMusic diyAudio Member Join Date: Feb 2008	all I need to know is the in box impedance curve so I know if it'll be ok to load the amp down to a nominal 0.25ohm

31st March 2011, 01:29 AM	#5
OscarS diyAudio Member Join Date: Jan 2011	yup it will do that very quickly

31st March 2011, 01:50 AM	#6
ThyDntWntMusic diyAudio Member Join Date: Feb 2008	properly? and accurately? what if its 16 woofers?

31st March 2011, 02:26 AM	#7
ThyDntWntMusic diyAudio Member Join Date: Feb 2008	thing is, every time I do an impedance sweep, I get massively varying results. ranging from peaks to about 5 ohms, right up to 20 ohms!

31st March 2011, 10:01 PM	#8
ThyDntWntMusic diyAudio Member Join Date: Feb 2008	also if I use it to measure the TS specs, mainly just to find the resonant frequency of the box, I get results between 24 and 28Hz... and it'll vary every time.

31st March 2011, 10:12 PM	#9
revboden diyAudio Member Join Date: Feb 2011	Are you standing in front of the driver or walking around the driver when testing? if so don't. Anything in front or behind the driver that will reflect sound will affect the results.

31st March 2011, 10:20 PM	#10
ThyDntWntMusic diyAudio Member Join Date: Feb 2008	the box is in a car, repeat tests with the doors shut result in varying results... I am however in the car with the woofers...

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