I've added a Subwoofer line out to my car audio direct from the TDA7406 chip SWACout (37).
The subwoofer audio level seems to be non-linear compared to the regular speakers. At low levels, the sub is level is too high but at higher volumes it's ok.
I'm wondering if I've made the wrong capacitor choice or if I'm being waaay to optimistic about this simplistic solution working successfully. There aren't a lot of circuit examples for the TDA7406, but the one's I've seen use a much lower cap in series with line-in. The same seems to go for other basic subwoofer circuits I've looked at.
I've used a 4.7uF WIMA cap in series from the SWACout (p37) of the TDA7406 to the line-in on the Pioneer sub figuring bigger is better.
Is it possible that the 4.7uF cap is too big and it's working in a non-linear fashion for the audio amplitude? Hoping to get some guidance before I pull the unit out of the car for some trial and error.
TIA
Other details:
Kenwood GX204 6 stacker (service manual readily available online)
TDA7406 (spec sheet readily available online)
Pioneer ts-wx130da subwoofer (don't have the LPF / level remote)
The subwoofer audio level seems to be non-linear compared to the regular speakers. At low levels, the sub is level is too high but at higher volumes it's ok.
I'm wondering if I've made the wrong capacitor choice or if I'm being waaay to optimistic about this simplistic solution working successfully. There aren't a lot of circuit examples for the TDA7406, but the one's I've seen use a much lower cap in series with line-in. The same seems to go for other basic subwoofer circuits I've looked at.
I've used a 4.7uF WIMA cap in series from the SWACout (p37) of the TDA7406 to the line-in on the Pioneer sub figuring bigger is better.
Is it possible that the 4.7uF cap is too big and it's working in a non-linear fashion for the audio amplitude? Hoping to get some guidance before I pull the unit out of the car for some trial and error.
TIA
Other details:
Kenwood GX204 6 stacker (service manual readily available online)
TDA7406 (spec sheet readily available online)
Pioneer ts-wx130da subwoofer (don't have the LPF / level remote)