PanasonicSA-XR70usedPanasonic SA-XR70 XR10, XR55 UpgradedUp for sale are two Panasonic XR10s ($500 original retail price), one XR55, and one XR70. They all have upgraded power supply capacitors, main lines, internal wiring, IEC power connectors, and oth...250.00

Panasonic SA-XR70 XR10, XR55 Upgraded

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Condition
8/10
Payment methods
Ships fromFairborn, OH, 45324
Ships toUnited States
Package dimensions8.0" × 16.0" × 20.0" (15.0 lbs.)
Shipping carrierUSPS
Shipping cost
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Original accessoriesRemote Control, Box, Manual
AverageResearch Pricing

Up for sale are two Panasonic XR10s ($500 original retail price), one XR55, and one XR70. They all have upgraded power supply capacitors, main lines, internal wiring, IEC power connectors, and other parts. I worked for 10-12 hours on each amp and countless research hours over the past years. These are the same listed on Ebay under gzoman_num_3 Look on there for a lot of pictures of each amp.

Basically, I reduced the THD from 0.09% stock to below 0.001% for each amp, as calculated with TI's chip parameters. Other factors come into play at that THD level, but the result is that they produce ridiculously detailed sound, push more amperage, and can handle low impedance speakers. I've used 4 Ohms speakers with no problems.

I've used the XR10s in concert, digitally bi-amping a 5.1 setup, active analog 3 and 4-way crossover system. The XR55 is great for digital bi-amping due to the built-in adjustable settings.

The XR70 I've had from new and comes with everything from new; box, remote, antennas, etc. The others come with original remote controls, ship in generic boxes.

Same as the Ebay listing, if you buy more than one, you only pay shipping for one. Contact me before buying so I can coordinate shipping, I will pass down a shipping discount when I ship multiple packages at the same time. Also, free pick up between Dayton, OH and Chicago and Rockford, IL along I-70 and I-65 (at Christmas time).

If you aren't familiar with them, the XR series keep the signal path digital until the actual amplification stage, PWM. Removing DACs allows it to reproduce sounds very precisely. Unfortunately, in stock form, they couldn't push low Ohm speakers. TI later published guidance on those chips and I corrected that issue accordingly.

$250 per amp.

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