Adding sub to JBL L110

[ifsixwasnin9]

I have Yamaha integrated amp and L110 speakers and I was told I could add a sub. My amp has 4 speaker outputs and I got a powered 400W sub. I connected sub to main speaker outputs and L110 to secondary outputs and I fooled with the sub volume and low-pass filter and barely got any sound.
Is there something I am doing wrong?
The sub doesn't need to be powered by the amp because it is powered, correct?

 

[Matt34]

What are the Yamaha and subwoofer model numbers?

 

[lovinthehd]

I have Yamaha integrated amp and L110 speakers and I was told I could add a sub. My amp has 4 speaker outputs and I got a powered 400W sub. I connected sub to main speaker outputs and L110 to secondary outputs and I fooled with the sub volume and low-pass filter and barely got any sound.
Is there something I am doing wrong?
The sub doesn't need to be powered by the amp because it is powered, correct?

Could be expectations exceed reality. Are the outputs on your integrated amp line level or pre-outs? Model numbers of all gear usually help.

 

[TLS Guy]

I have Yamaha integrated amp and L110 speakers and I was told I could add a sub. My amp has 4 speaker outputs and I got a powered 400W sub. I connected sub to main speaker outputs and L110 to secondary outputs and I fooled with the sub volume and low-pass filter and barely got any sound.
Is there something I am doing wrong?
The sub doesn't need to be powered by the amp because it is powered, correct?

You likely have an amp you can't add a sub to, unless the sub has speaker level inputs and most don't. Most integrated amps are not really compatible with subs.