I have a Onkyo 505 and just bought a Velodyne VRP Series 10" sub. I'm getting little to no base. I have the sub set to "on" on the receiver and everything cranked up on the sub but still very little base.

Anyone have any insight?

I checked the threads and didnt see this posted,

Speaker size settings LARGE or SMALL? Have you calibrated your setup?

I put the speaker size to small for my center and fronts and no change. I lost the microphone that came with the receiver

What's your crossover set at?

What are you using to test the sub (DVD? CD? TV show?)

Check you are connected to the Pre-out Subwoofer jack on the AVR.
Did you set the Crossover to 80?
Is the sub turned on?
Have you used the sub cable before and know it is good?
What sub do you have and how are you connected to it?
Perform the Speaker Level setup instructions on page 59 of the manual.
Go buy a replacement mic.
Turn the sub gain down while trying to figure this out. You don't want to blow it if all of a sudden we fix the problem.

Check you are connected to the Pre-out Subwoofer jack on the AVR. Yes
Did you set the Crossover to 80? Yes
Is the sub turned on? it is auto on
Have you used the sub cable before and know it is good? It's brand new
What sub do you have and how are you connected to it?Velodyne VRP 1000
Perform the Speaker Level setup instructions on page 59 of the manual. Did that
Go buy a replacement mic.
Turn the sub gain down while trying to figure this out. You don't want to blow it if all of a sudden we fix the problem.

updated

This is from Velodyne's web site about connecting to both left and right inputs. Are you sure the sub is turning on?

Important Installation Information

VX-10, VRP-1000 and VRP-1200 subwoofers are equipped with speaker-level terminals and line-level input jacks. When using the line level jacks, some receivers may not provide enough signal to have the unit's auto-on feature operate properly. Additionally, this lack of signal may also cause the subwoofer to produce less output than it is capable of.

To alleviate this condition, we recommend the following steps:
If using line level jacks, BOTH THE LEFT AND RIGHT INPUT SHOULD ALWAYS BE USED - never use just the left or just the right input. If the subwoofer's input comes from the LFE channel of your receiver, use a "Y" splitter to divide the single input into two inputs for the Left and Right subwoofer inputs. If using line level connections from a preamp or signal processor, use both Left and Right inputs from your preprocessor or preamp and connect them to the Left and Right inputs on your subwoofer. This information supercedes the line level installation instructions in the owner's manual.
If using a receiver with LFE out, be sure the LFE channel is sending adequate signal to the subwoofer. We recommend setting the subwoofer's level to the 9 o'clock position (the 1/4 volume setting) and then adjust the LFE channel on your receiver or processor to achieve the desired bass output. See your receiver or processor's owner's manual for more information.

If you need a Y-splitter, Velodyne will provide one free of charge to North American customers by sending an email to ysplitter@velodyne.com and including your name and address, the serial number of your subwoofer, and place of purchase.