Anyone using woofer tester 3? - little help needed.

oublie · 09:24 PM

hi,

i've been running some tests on drivers in particular a 4 inch mid. after running the tests for both free air and vas this is my results. These seem a little too strange - btw i ran the test several times and got very similar results - i also tried a few of these.

can someone confirm that i'm taking the right measurements as im ending up with a huge ported box with an f3 of 44 hz! and i'm exceeding xmax (3mm) with 5 watts!

the driver is a driver designed for a ported enclosure it has been run in for several months original spec show fs around 90hz, vas 1.6l but i'm reading 72hz and 5.9 litres.

note ive got piston diameter = to Dd - is that correct?

little help please,

heres the wt3 result.

badman · 31st January 2011, 09:32 PM

Looks like you may have a weaker motor than you expected in addition to the lower Fs- what's published Qts? An underdamped motor can have a big Vas.

oublie · 31st January 2011, 09:48 PM

here the published specs

QES 0.63
QMS 2.84
QTS 0.516
FS 89.98
VAS 1.62L
MMS 5.3
RE 3.8
BL 4.24
SD 43.9

Inductor · 12:14 AM

Quote:

Originally Posted by oublie

note ive got piston diameter = to Dd - is that correct?

I don't know. Aren't you using Sd?

Everything seems fine, only 70->90 is a long way.

oublie · 2nd February 2011, 01:11 PM

i'm going to remeasure a few of these to get an average for them, i have some used and some still in the boxes so ill do a comparison to work out what they are capable of. The only thing that concerns me is the fact that these little speaker if measurements are correct should be capable of very low bass for their size e.g 12 in a ported box in line configuration should get me 116db @ 1m from 50hz to crossover at 1khz according to winisd - seems too good to be true

31st January 2011, 09:32 PM	#2
badman Custom Title diyAudio Member Join Date: Sep 2003 Location: Sunny Tustin, SoCal	Looks like you may have a weaker motor than you expected in addition to the lower Fs- what's published Qts? An underdamped motor can have a big Vas. __________________ I write for www.enjoythemusic.com in the DIY section. You may find yourself getting a preview of a project in-progress. Be warned!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Amplifier for woofer needed	tpsorin	Solid State	1	24th March 2009 10:59 AM
Anybody tested the Dayton woofer tester 2	ostie01	Multi-Way	4	17th April 2006 03:29 AM
W shaped dipole woofer - some help needed.	Mattias S	Multi-Way	17	17th December 2003 09:40 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

31st January 2011, 09:48 PM	#3
oublie diyAudio Member Join Date: May 2009 Location: Northern Ireland	here the published specs QES 0.63 QMS 2.84 QTS 0.516 FS 89.98 VAS 1.62L MMS 5.3 RE 3.8 BL 4.24 SD 43.9

2nd February 2011, 01:11 PM	#5
oublie diyAudio Member Join Date: May 2009 Location: Northern Ireland	i'm going to remeasure a few of these to get an average for them, i have some used and some still in the boxes so ill do a comparison to work out what they are capable of. The only thing that concerns me is the fact that these little speaker if measurements are correct should be capable of very low bass for their size e.g 12 in a ported box in line configuration should get me 116db @ 1m from 50hz to crossover at 1khz according to winisd - seems too good to be true

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)