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Item: Audio Research EC-4 three way active tube crossover Location: Adelaide (will post interstate) Price: $450 Item Condition: Good used condition Reason for selling: Using digital DSP (shock, horror) Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: This is a classic and rarely seen three way active crossover by Audio Research. It dates from the mid to late seventies. Frequencies are adjusted by changing capacitors on the circuit board. Crossover points are selectable at 50/100/400/500/800/1k/1.5k/2k/3.5k/5kHz. Uses 6 x 12AX7 tubes. This particuar example has been modified both for practical reasons (to operate at 240v) and for sonic improvements. A new 240v transformer has been added, along with an assortment of upgraded capacitors and resistors. In the process, RCA connectors have been moved to the front of the chassis. Unfortunately these modifications have not been carried out with aesthetics in mind. Nevertheless, if you can get past the less than immaculate appearance, this crossover will not disappoint. This is a rare, collectible – and for someone with an active three way system, a serious consideration. Info and photos of this unit in its original state can be found here: http://www.arcdb.ws/EC4/EC4.html I am happy to package and send this item interstate at buyer's expense. Please budget $30 to $50 for this, depending on your location. Similarly, a buyer in Adelaide is welcome to collect in person from the Adelaide CBD. ELECTRICAL DISCLAIMER This product has not been manufactured by a qualified individual or company, therefore contains electrical circuits that do not necessarily comply with Australian Standards. I understand that as the seller, I may be liable to repercussions in the event of equipment failure. By advertising and selling this product, as the seller I also agree that I am solely liable, and the publisher of this website takes no responsibility for any injury or death resulting from, whether directly or indirectly, any accident that may happen as a result of the failure of the product being sold. If in doubt, seek the services of a qualified electrician to inspect the product to ensure it is safe for use. Pictures: