It's impossible to tell simply by reading the specs but your amplifier appears to be underpowered for your speakers. If that is the case then Bob has given you some important advise to consider.
The DD-10 Plus is a very potent sub with far less distortion than its already low distortion predecessor. It has many connectivity setup options which are located in the User Manual.
http://velodyne.com/pdf/digitaldriveplus/63-161_DD+%20Users%20Manual_web_Rev%20A.pdf
For an economical pair of long run RCA interconnects and Y connectors Blue Jeans Cable offers decent quality and fast delivery.
The User Interface manual goes into detail on how to use the Manual Room Optimization program which can also be found on the Velodyne website. These adjustments are straight forward. On the other hand you may find that relocating the sub and/or tweaking the adjustments over time can further the integration with your speakers and/or the room.
You should set one of the presets to 180 degree polarity since many recordings are out of phase and you may hear the bass drum tighten up.
The DD-10 Plus is a very potent sub with far less distortion than its already low distortion predecessor. It has many connectivity setup options which are located in the User Manual.
http://velodyne.com/pdf/digitaldriveplus/63-161_DD+%20Users%20Manual_web_Rev%20A.pdf
For an economical pair of long run RCA interconnects and Y connectors Blue Jeans Cable offers decent quality and fast delivery.
The User Interface manual goes into detail on how to use the Manual Room Optimization program which can also be found on the Velodyne website. These adjustments are straight forward. On the other hand you may find that relocating the sub and/or tweaking the adjustments over time can further the integration with your speakers and/or the room.
You should set one of the presets to 180 degree polarity since many recordings are out of phase and you may hear the bass drum tighten up.