If you bought the 39 from a dealer you can get it upgraded the same day (provided they have the kit in stock) for $1500, if you bought it used you have to send it to Madrigal and the price goes up to $1800. The 390s has a much more natural sound with greater depth and more resolution. If you listened head-to-head I'm sure you would agree that the upgrade is definately worth the price.
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