bass speakers review

Can I connect a bass amp cabinet to the Sub out on my roland 60 Kč?
I have a Roland KC 60 which i use as an amplifier Low murderer was wondering if i could connect either a 1x15 or 2x10 subwoofer so that through the subwoofer out of the way the people who gave this amp say negetive comments and distorts the volume 3 after just dont know how I configure this at least in volume 5 at all times
The subwoofer output is a connecting line level output with a low pass filter and DC blocking. You http://www.bhphotovideo.com/c/product/277629-REG/Roland_KC_60_KC_60_40_Watt.html You can not just connect a passive speaker there. You need a power amplifier to drive the speakers.
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How to Shop for Speakers

What should I look for when shopping for new car speakers?
The speakers I have now are good but I prefer the new ones stronger.
You say you want to go higher. aftermarket speakers are better quality than OEM speakers in large part to better materials. However, this also means they are not as efficient as OEM speakers to be replaced which means that your new speakers can handle more power and may sound better, but they also need more power for optimal performance. ie replacing the speakers and they are not as strong as their place of origin. Proper acquired and crossed OEM speaker amp will not hurt them stronger. So if you feel you still need more you can buy new speakers and know they have the power you need for them to perform optimally.
Car Audio : How to Shop for a Car Subwoofer