The AT-600ProII was originally used with my ALS-600 amplifier, which is an excellent combination, as seen on my QRZ page. I now have an AT-1000ProII. I am the original owner of both units and I live in a smoke free environment. They are in the original boxes and will be combined in a larger container for shipping. Shipping to lower 48 only. PayPal preferred. $260.00 shipped.