I would tend to agree with ZD542. The Bach Grands are 4 ohm nominal speakers, meaning they probably dip below 4 ohms in part of the audio band. Very few receivers are capable of properly driving a 4 ohm or less load.
Buying a separate amp that is rated to drive 4 ohm loads will result in better bass definition and control. As ZD542 mentioned, you may find the need for a subwoofer is mitigated or even eliminated. I would certainly try this first before investing in a subwoofer.
You may want to consider auditioning something like Emotiva's XPA-200: 240 watts/ch. (into 4 ohms) stereo amp which has a 5-year warranty. The cost is only $499 (with free shipping) and they give you 30-days in-home trial and will pay to ship the unit back if you decide not to keep it.
http://shop.emotiva.com/collections/amplifiers/products/xpa200
The Emotiva amps are seriously good for the money...
-RW-
Buying a separate amp that is rated to drive 4 ohm loads will result in better bass definition and control. As ZD542 mentioned, you may find the need for a subwoofer is mitigated or even eliminated. I would certainly try this first before investing in a subwoofer.
You may want to consider auditioning something like Emotiva's XPA-200: 240 watts/ch. (into 4 ohms) stereo amp which has a 5-year warranty. The cost is only $499 (with free shipping) and they give you 30-days in-home trial and will pay to ship the unit back if you decide not to keep it.
http://shop.emotiva.com/collections/amplifiers/products/xpa200
The Emotiva amps are seriously good for the money...
-RW-