I agree pretty much with The Audiotweak. My experience with the MGD Deluxe Justarack was that it sounded phenomenally bloated and indistinct on the bottom end while completely destroying the harmonic structure and the "air" around instruments. I know others that have / use these racks though and really like them. As far as the Polycrystal's go, i've never used them.
For the record, i have no affiliation with any rack manufacturers in case you are wondering. Sean
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For the record, i have no affiliation with any rack manufacturers in case you are wondering. Sean
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