I have two suggestions:
1 integrate your subwoofer properly, i.e. find the best location, correct level and correct low pass filter frequency. Use measurements for this.
2 once that is done, try to equalize the combined response with an REW curve, but avoid equalizing above about 200 or 300 Hz. You can use a computer as a source for the experiment by installing the free equalizer APO software on the PC and upload the REW correction curve into the EQ APO. Evaluate the result, not just for the main listenng position but also elsewhere. If reducing dips and obtaining a smooth reponse over a wider area are seriously unsuccessful, get a sesond sub.
1 integrate your subwoofer properly, i.e. find the best location, correct level and correct low pass filter frequency. Use measurements for this.
2 once that is done, try to equalize the combined response with an REW curve, but avoid equalizing above about 200 or 300 Hz. You can use a computer as a source for the experiment by installing the free equalizer APO software on the PC and upload the REW correction curve into the EQ APO. Evaluate the result, not just for the main listenng position but also elsewhere. If reducing dips and obtaining a smooth reponse over a wider area are seriously unsuccessful, get a sesond sub.