Purchased 2 of these drivers with the intention to build a set of small ML-TL's. Before the actually build I want to do some simulations to get an idea of what can be achieved. Tried to measure the FS of these and think I measured 107 Hz. Put to one of the drivers about 10 hours of music and measured again: 103 Hz. Way higher compared to the specs: 82 Hz.
I measured using Limp (Arta), the headphone output and a 50 ohm resistor.
As I can't be accused of much experience, thought some on this forum could say something sensible on this phenomenon 🙂
Appreciate any feedback.
-Rolf
I measured using Limp (Arta), the headphone output and a 50 ohm resistor.
As I can't be accused of much experience, thought some on this forum could say something sensible on this phenomenon 🙂
Appreciate any feedback.
-Rolf
How hard did you hammer them when playing music?
I'd try to get the cones visibly moving on the bass. In the case of one of my 15" subwoofers, I ran it at over 1" peak-to-peak travel for a few hours to make sure the suspension was suitably tenderised.
Chris
I'd try to get the cones visibly moving on the bass. In the case of one of my 15" subwoofers, I ran it at over 1" peak-to-peak travel for a few hours to make sure the suspension was suitably tenderised.
Chris
Didn't play very loud as without enclosure it sounds a bit too harsh. Will give that definitely a try now.
Tnx Chris
Tnx Chris
Loosening the suspension should lower Fs somewhat. But welcome to the world of
a/ Production tolerances, and
b/ Variations in data produced by different test hardware and methodologies.
This is not a reflection on any person, hardware or drive unit. For example, I'm currently having a merry time trying to reconcile data taken by the now unfortunately obsolescent LMS, with data of the same drivers taken using a current version of Clio. Suffice it to say, if I had uttered over the blower some of the language I have been using, the CPS would do me for an obscene 'phone call.
a/ Production tolerances, and
b/ Variations in data produced by different test hardware and methodologies.
This is not a reflection on any person, hardware or drive unit. For example, I'm currently having a merry time trying to reconcile data taken by the now unfortunately obsolescent LMS, with data of the same drivers taken using a current version of Clio. Suffice it to say, if I had uttered over the blower some of the language I have been using, the CPS would do me for an obscene 'phone call.
No problem. Feel free to turn the bass up to get the cones moving without the mid/high range getting too loud.
Chris
@Scottmoose
value much your feedback as I am a newbie as I have some technical background and understand your remarks on tolerantes and measure methods.
I should have mentioned before but I did similar measurements on 2 other small drivers, just out of the box:
PS95-8 fs specs 120Hz, measured 120 Hz (same brand)
TG9FD-10-04 fs specs 113Hz, measured 134 Hz
That's why I was puzzled on the 25%> Fs off specs of the PC83-4's
value much your feedback as I am a newbie as I have some technical background and understand your remarks on tolerantes and measure methods.
I should have mentioned before but I did similar measurements on 2 other small drivers, just out of the box:
PS95-8 fs specs 120Hz, measured 120 Hz (same brand)
TG9FD-10-04 fs specs 113Hz, measured 134 Hz
That's why I was puzzled on the 25%> Fs off specs of the PC83-4's
[Potentially] different factories or lines, different part tolerances, different batches, different driver types all play a role. There is never a fixed set of conditions that applies across the industry, because there are no obligatory standards; you'll find it varies even within brands (with a handful of exceptions). It's a fairly large deviation on Fs, where things are often tighter, but I've seen equal or greater. Depending on the spider design you might see that drop by about 10% as the official measurements state modest mechanical damping at resonance; I'd be surprised if it dropped significantly more than that though.
After pushing this small driver seriously I am at an Fs of 100 Hz so not what I envisioned, bummer. Have to acknowledge the expert told me so.
Back to the drawing board....
Back to the drawing board....
