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the Servo 15 was probably cheaper than the BP150i
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Hopefully, we're talking about the same products here. The Mirage BPS-150i was a dual 8" mid priced sub that sold for about $600US and had a response that was down 3dB at 22Hz. The spec sheet is
here
The Paradigm Servo-15 is a servo controlled 15" sub that sold for about $1500US and had a response down to 14Hz.
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I know the Servo15 sacrifices some low end grunt for acuracy
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Not at all - it is known for its low end extension capabilities.
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You really don't think its worth experimenting ?
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Sure, but let me tell you what will likely happen. You can easily verify this with Room EQ Wizard.
The desire is to have a smooth response, so hopefully both subs are contributing a certain spl level across the low frequency spectrum.
Let's look at 50Hz. Both subs can easily produce this frequency and lets say each contributes evenly to the final spl level of 50Hz in the room.
Now consider what happens at 15Hz when the Servo outputs the same level it outputs at 50Hz and the Mirage output has dropped off the map. You need both subs to contribute to the overall level and one isn't doing the job, so the overall spl level is lower at 15Hz. If you had used the Servo by itself you would draw from its headroom and use it alone to contribute to the desired level in the room producing and even response down to 15Hz. Two or more subs only add headroom (if needed), but can be a response killer if the two subs don't match.
brucek