I just got my DATS v3 and measuring my subwoofer its way out of spec from what the manufacturer says. I took it out of the box and hooked it right up to the DATS so nothing inline, crossover or anything. The FS is 17% different, the QTS is 33% off, the QMS is 40% off! I know these percentages are relative and .31 and .48 may not mean everything but the FS is substantial enough. I just have the sub sitting on the floor with the vent exposed, am I measuring wrong? I took 3 measurements, 2 are shown and the factory specs are on the right.
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Joined 2003
A Morel driver that's off spec, why am I not surprised? 😉
So a few things, T/S varies with voltage, temperature, break-in, etc. so comparing values directly is often a shot in the dark. Morel spec sheet indicates T/S parameters measured at 3 volts. Rather high for calling it T/S IMO, and the DATS is only capable of measuring up to 1.4V (+5dBu), so direct comparison at the correct test voltage is not possible.
Rather than comparing any parameter directly, you should compare the result that these parameters provide - the box model. Complete the measurements with your DATS (mms, VAS needs to be completed still), then input the parameters to your favourite enclosure modelling program and compare how far off the box model is between the manufacturer and your driver. Alternatively, throw away the manufacturer data and decide if the modelled results of your driver in-box suit your needs and expectations.
So a few things, T/S varies with voltage, temperature, break-in, etc. so comparing values directly is often a shot in the dark. Morel spec sheet indicates T/S parameters measured at 3 volts. Rather high for calling it T/S IMO, and the DATS is only capable of measuring up to 1.4V (+5dBu), so direct comparison at the correct test voltage is not possible.
Rather than comparing any parameter directly, you should compare the result that these parameters provide - the box model. Complete the measurements with your DATS (mms, VAS needs to be completed still), then input the parameters to your favourite enclosure modelling program and compare how far off the box model is between the manufacturer and your driver. Alternatively, throw away the manufacturer data and decide if the modelled results of your driver in-box suit your needs and expectations.
Ok will do I haven't tried to figure out those other parameters yet. Is Morel known for stuff like this? Thanks for the voltage specs I did see they were testing with 3v, but how does this work in the real world. What do most amps put out? Does voltage vary or do they all put put similar voltages or is it not something worth really worrying about?
Till you measure Vas (Cms), which should measure < 60 L till broken in based on its too high Fs, Qes, Qms, Qts, there's not enough info to know. This article explains how all these specs interact ergo how important it is to accurately measure it and as fate would have it, the hardest to do.
Amps put out however much voltage is required based on its power ratings; remember this chart? 😉
Amps put out however much voltage is required based on its power ratings; remember this chart? 😉
