I installed an Alpine CDA-7839 and Soundstream Continuum in a 2003 Jeep Wrangler. The soundbar is an upgraded aftermarket one and the dash speakers and subwoofer have all been upgraded. The problem is, even with the volume on the head unit turned all the way up (and the gain settings on the amp all the way up as well), the volume is equivalent to about half volume on the stock head unit. I have double checked all connections and settings, but I am at a loss
Interesting that you have a Soundstream "The Continuum" amplifier. This is limited edition of the Reference 705 amp produced with a polished aluminum (not chrome) case. You have a very hi quality - Old School - amp.
Properly installed this amp should produce more than ample volume levels and certainly far more than a stock unit.
Because the Alpine head unit provides sufficient voltage to drive the amp, it is likely either the wiring, or, the way you have it set up.
The amp has a large internal capacitor bank and for proper operation, this amp must be connected directly to your car battery, prefereably with 4 AWG. (The amp is made with 4 AWG power connections.) Use high quality speaker wire run directly from each speaker to the amp.
If you have done the above, then it is probably the way you have it set up. The amp is sophisticated with many configuration options. Do not change any switch settings while the amp is playing. Ensure you have the appropriate inputs and crossover selected. Check the gain settings.
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