Boston Acoustic MCS90 8" Sub Replacement

[whitedragon551 5,000+ posts]

One of the General Managers where I work has a Boston Acoustics MCS90 sub that came out of a Denon DHT-590BA 5.1 HT setup. Its an 8" sub and 100wrms at 8 ohms. Its not working right so if I determine its the sub thats bad Im looking for a replacement. I have to figure out the dimensions of the box internally before I narrow it down to a sub so any help on that would be appreciated as well.

Here are the specs I found on the box.

390mm x 324mm x 390mm

15 3/8" x 12 3/4" x 15 3/8"

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[whitedragon551 5,000+ posts]

Did some testing with multiple speakers. Its definitely not the amp or sub. I think it may be the RCA's on the receiver.