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measuring TSP - driver variation

Just got the Dayton woofer tester - easy to use, results seem right compared to a spec sheet / each other - so hooray.

I'd like a sanity check on one anomaly.

I tested 4 wide band drivers, P-Audio SN4-60F: These are basically beefed up TV speakers. I'm experimenting with front horns for a target sensitivity of ~95dB (like a baby Oris).

The one driver I have been using for tests / listening seems like a poor pick, I think I grabbed the runt of the litter: the Qes is substantially higher and efficiency lower than spec, which is not what I'd expect as a result of break in.

This is the average of the unused three:

5.897 Re (spec = 5.9)
105.4 Fs (spec is 112)
0.3763 Qts (spec is 0.41)
0.492 Qes (spec is 0.53)
1.602 Qms (spec is 1.69)
0.2077 Le(10kHz) (spec is 0.12 but measured at 1kHz)
5.15 Mms (g)
2.527 Vas (litres)
89.65 SPL(1W/1m) (spec is 90)

...and the anomaly:

5.651 Re
105.7 Fs
0.595 Qts
0.8606 Qes
1.928 Qms
0.2025 Le(10kHz)
5.146 Mms (g)
2.506 Vas (litres)
87.25 SPL(1W/1m)

Q1: is that simply an off-spec unit, rather than change from use? It shows no signs of damage and plays cleanly, so I don't think it has been dropped / bashed.

Q2: when matching up pairs, is Fs the most important spec to align?


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Topic - measuring TSP - driver variation - hollowboy 02:19:50 01/15/15 (6)
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