D series ampsa re more efficient and all I've ever seen em in is mono blocks. If the amp is big enough and can handle lower ohm ratings you can run multiple subs off a mono block. Most of the mono blocks I've seen are internally bridged but still have two outputs. I ran three 12" 8000 MTX's off a 1000D MTX mono block and it worked just fine, pushin about 1500 watts rms through the 3.
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