Good morning.
So I have an F150 with HERTZ components/coax Mille line
6x9 front door 6.5 rear doors. A pillar tweeters,
Dual 12 inch subwoofers
JL powered 75watt RMS.
How flat should the fequency response be on the RTA? Is it ok to see 1-2db of variation on a 31 band EQ? Does it need to be perfectly flat across the frequency spectrum — or as flat as possible? Mine roll off nicely down the crossover slopes, but there is wiggle in the frequencies in the flat part
Of the curves. There is variation of probably 2-3db at the worst and 1-2 ar the least. My decibel levels are balanced beautifully from tweeter to front door to rear fill... there isn’t any frequency peaks when the speakers are RTA’d together.
I’m using very good amps and what I thought were very good speakers.
I’m a novice so any advice is appreciated.
So I have an F150 with HERTZ components/coax Mille line
6x9 front door 6.5 rear doors. A pillar tweeters,
Dual 12 inch subwoofers
JL powered 75watt RMS.
How flat should the fequency response be on the RTA? Is it ok to see 1-2db of variation on a 31 band EQ? Does it need to be perfectly flat across the frequency spectrum — or as flat as possible? Mine roll off nicely down the crossover slopes, but there is wiggle in the frequencies in the flat part
Of the curves. There is variation of probably 2-3db at the worst and 1-2 ar the least. My decibel levels are balanced beautifully from tweeter to front door to rear fill... there isn’t any frequency peaks when the speakers are RTA’d together.
I’m using very good amps and what I thought were very good speakers.
I’m a novice so any advice is appreciated.
The FR in acoustic environment is a lumped product of the driver's linear frequency output, driver and amplifier distortion, and the environment's time delay effects (which is also another form of distortion, just in the time domain).
A response EQ'd to flat will not automatically ensure higher fidelity. If you have to add say 4dB of boost to an area where the driver's distortion peaks (or you have a mode), it will sound nasty. My usual method is to first EQ flat and then use common sense to work out where the system has to have a little 'give'. Others may advise a FR sweep and THD measurements for a more accurate picture of system performance.
A response EQ'd to flat will not automatically ensure higher fidelity. If you have to add say 4dB of boost to an area where the driver's distortion peaks (or you have a mode), it will sound nasty. My usual method is to first EQ flat and then use common sense to work out where the system has to have a little 'give'. Others may advise a FR sweep and THD measurements for a more accurate picture of system performance.
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