Why do so many trust parameters by someone over the manufacturer's? It would seem the manufacturer's use the best available equipment and testing methods while the DIY community use Woofer Tester, DATS or whatever.
Manufacturer's test many drivers and then take averages which seems fair to me. I can't imagine that the SS midbass has a listed qts. 41 but a DIY measures .56 and it's taken as gospel.
7L sealed worked very nicely with that SS 15W for me
Manufacturer's test many drivers and then take averages which seems fair to me. I can't imagine that the SS midbass has a listed qts. 41 but a DIY measures .56 and it's taken as gospel.
7L sealed worked very nicely with that SS 15W for me
Because I trust my own measurements today more than manufacturer's done 15 years ago. My measurements of several models of Revelator range brings much higher Qts than advertised, regardless of the method or equipment used.
Did you measure the frequency response of your 15W in a 7 L sealed box, to confirm the manufacturer's data?
Did you measure the frequency response of your 15W in a 7 L sealed box, to confirm the manufacturer's data?
Clarification: drivers manufactured 15 years ago may be somewhat different today (" Data are subject to change without notice").
With the same methods and equipment my measurements of several other manufacturer's
woofers are similar or same as theirs. This include several models of ScanSpeak Discovery range.
With the same methods and equipment my measurements of several other manufacturer's
woofers are similar or same as theirs. This include several models of ScanSpeak Discovery range.
I agree with Sonce and marley. What I suspect, Waboo may not be aware of is that TSP evaluation is based on very simple 2 impedance plots of the driver and then applying standard formulae to calculate. There is nothing high end about measuring impedance, a reason for introducing any difference between manufacturer's and DIYer's could be the driving voltage.
I am a long time owner of nowadays obsolete Audiomatica Clio 4.51 and I have also measured quite some differences with different brands, others were almost exact as the factory. Nothing new, no need to be alarmed.
Dr. Geddes would say on the topic, I don't care about TSP nonsense, I just equilize actively and do the multiple subwoofer setup to remedy seat to seat SPL variation.
I am a long time owner of nowadays obsolete Audiomatica Clio 4.51 and I have also measured quite some differences with different brands, others were almost exact as the factory. Nothing new, no need to be alarmed.
Dr. Geddes would say on the topic, I don't care about TSP nonsense, I just equilize actively and do the multiple subwoofer setup to remedy seat to seat SPL variation.
You got me thinking that the current stated TSP's indeed seem a bit different than I recall from when I used the SS 15W in a sealed 7L in the early 2000's. I pulled out some old Madisound printed catalogs from my sacred box in the closet. Here's what they show from 2001 and 2008.
2001 and 2008: (identical T/S)
Fs 30hz
Vas 28L
Qts .35
Current:
Fs 32hz
Vas 24L
Qts .41
This little woofer probably digs a little deeper now than when I used it in the early 2000's.
great!
this was the error that I make in the calculations...to consider the highest qts but the vas from official datasheet
Just reading this thread and all measurements I've seen equal the same size enclosure, I wd say no bigger than 11 litres for each driver