lowpoke Posted February 24, 2017 Share Posted February 24, 2017 (edited) SOLD Item: Audio Research EC-4 three way active tube crossoverLocation: Adelaide (will post interstate)Price: $450Item Condition: Good used conditionReason for selling: Using digital DSP (shock, horror)Payment Method: Pickup - Cash, Paypal, COD OnlyExtra 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: Edited February 24, 2017 by lowpoke 1 Link to comment Share on other sites More sharing options...
Bunno77 Posted February 24, 2017 Share Posted February 24, 2017 Very cool 1 Link to comment Share on other sites More sharing options...
abelb Posted February 24, 2017 Share Posted February 24, 2017 I wish my speakers were bi-wireable, would to give this a shot! GLWTS very reasonable price for a rare piece of ARC history. 1 Link to comment Share on other sites More sharing options...
Red MacKay Posted February 24, 2017 Share Posted February 24, 2017 I am curious why one of the tubes is a 12AU7. They should all be 12AX7s. I own one of these, a smooth sounding crossover, no digital rubbish here! 1 Link to comment Share on other sites More sharing options...
lowpoke Posted February 24, 2017 Author Share Posted February 24, 2017 Not sure. This unit has been modified from original though. But as I was not the one responsible for the mods, I can't really answer your question. Link to comment Share on other sites More sharing options...
Administrator Marc Posted February 24, 2017 Administrator Share Posted February 24, 2017 You need to add the electrical disclaimer to your post. Link to comment Share on other sites More sharing options...
lowpoke Posted February 24, 2017 Author Share Posted February 24, 2017 24 minutes ago, Marc said: You need to add the electrical disclaimer to your post. Done. Link to comment Share on other sites More sharing options...
Decky Posted February 24, 2017 Share Posted February 24, 2017 Ha ! This brings some memories. GLWS! Here is the service manual and schematics - if anyone wants to do more mods. http://www.audioresearch.com/ContentsFiles/EC2EC4_Manual_Schem.pdf I can answer some question regarding the DIY work - it's been a while.... 1 Link to comment Share on other sites More sharing options...
tesla13BMW Posted February 24, 2017 Share Posted February 24, 2017 Wish I could get hold of two of these as I'd like to try the ESL's on a high pass! 1 Link to comment Share on other sites More sharing options...
lowpoke Posted February 24, 2017 Author Share Posted February 24, 2017 (edited) SOLD pending receipt of funds. Edited February 24, 2017 by lowpoke Link to comment Share on other sites More sharing options...
tygersmoke Posted February 24, 2017 Share Posted February 24, 2017 15 hours ago, Decky said: I can answer some question regarding the DIY work - it's been a while.... Hi Decky, Do you mean you did the mods on this unit? I'd be interested to have a chat with you if so, as I am the new owner of this crossover, all things going well. I'll send you a PM when I take possession, Phil 1 Link to comment Share on other sites More sharing options...
Decky Posted February 25, 2017 Share Posted February 25, 2017 Sure - no probs. Any time. Link to comment Share on other sites More sharing options...
tygersmoke Posted February 26, 2017 Share Posted February 26, 2017 Thanks Decky, much appreciated! If all goes smoothly, I'll touch base with you probably later in the week. Regards, Phil Link to comment Share on other sites More sharing options...
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