- Dec 11, 2015
- Reaction score
- Central VA
- 2016 Civic Touring sedan, 2002 Viper
I improved the measurements I did previously by using a voltage divider circuit to avoid clipping, and I measured the front tweeter signal this time too. Most importantly, I measured at different volume levels (15, 20, 25 and 30 @makemerush). That's because a lot of Honda vehicles have been found to have volume-dependent EQ, presumably to reduce the bass going to the speakers as you turn the volume up since they use crappy speakers that can't handle it.
Raw results, measured at 1/48th octave resolution then smoothed to 1/6th:
(note that these are line VOLTAGE measurements, not speaker VOLUME measurements)
I added the sub, mid, and tweeter curves together using REW's A+B trace math to make it easier to compare the shape of the curve at each volume level:
So, no wonky EQ that varies with the volume setting like many Hondas have! This is great because it means if you use one of the many OEM integration DSP products that measure and correct the output of factory headunits (e.g. JBL CleanSweep), you won't have the problem of the curve changing as you increase or decrease the headunit volume. Flat output is possible at all volume levels!
Note: no conclusions should be drawn from this for the lower trim stereos (the ones without a factory sub)! It's possible (and in my opinion likely) that they do not work the same way.