Definitive Tech home theater Question

Oh gotcha. Yeah it’s worked for years. Though we had a child almost two years ago so am now just listening to it louder again. I don’t know what’s going on. 

Low Frequency Effects

i.e. subwoofer.

Thank you for that. Since I posted I’ve been trouble shooting and only the sub in the front right speaker is firing. Though the other speakers lights are on and the normal sound is coming out of them. 
 

To be honest I don’t know what LFE is. 

Yeah that doesn’t make any sense at all as your speakers have prodigious bass. Do you have the LFE input on the speaker connected to the Denon, and have you checked the volume level of the speaker’s built-in subs? Are the subs working and is the LED lit? Make sure you have the Denon connected to the speaker level input and not the height speaker input (I know this is stupid but just trying to cover all bases). If all this looks good then it might be a setting in the Denon’s menu options so make sure you have the LFE output enabled, you have the front L/R speakers set to full range (looks like your center speakers could maybe run full range too), no compression is enabled, etc. Look through the manual for other menu options and troubleshooting ideas. Something’s amiss somewhere here, just gotta do some digging to find it. Hope this helps a little, and best of luck finding the problem.