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Product code: EW70V
Turn your standard in-ceiling or in-wall speakers into a 70-volt music or paging system with this high-quality adapter. It's designed for indoor and outdoor use, and all you need to do is plug in your 8-ohm speaker wire. It features an external burial in-line transformer switch with weatherproof design, and the input to output cable seals 8-ohm to 2.5, 5, 10, 15 and 20-watt taps. It comes in an ABS impact-resistant enclosure for maximum protection.
I am a little confused regarding the SONANCE Amplifier and 4 Satellites you are using. The AMP 2-750 MKII shows it has 750 watts at 70V but not listed in its Owner's Manual. That withstanding you have a $1500 Amplifier and 4 Satellite speakers at roughly $550 each. The Speakers rated at 70V/50Watts each. If you add the Sonance 12" in Ground sub, it would cost $2,000 but does include an internal Transformer. I think that you paid over $3,000 for the AMP and Satellites from a SONANCE Dealer or you bought a house with the speakers already installed, or you just bought them on eBay at a lower price. So I am trying to figure out how you selected 2 TIC 8 inch outdoor subs at $114 each. Then I see they have an outdoor 70V step-up transformer just like our EW70V at $34.00 versus $14.99 for the OSD unit. And both are limited to 20W taps which will not do anything for your application. The SONANCE 12" In-Ground Sub has a 70V 300W step-up transformer more in line with the AMP and Satellites. I have a solution that might work for you and (2 solutions) behalf or 2/3 the cost of the SONANCE 12". One is an 8" In-Ground with internal 70V/150W tap or the 12" that features a 70V/300 watt tap much like the SONANCE 12". I am sending you information on the two Black Series In-Ground directly to your email. I can provide you more information and a quote on both of the Subs.
My contact email; email@example.com
We have a newer High Power Step down transformer coming that has a high Tap setting of 100 Watts (SP70VT100W), but the TIC subwoofers are a strange match for the SONANCE.