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The Ext90 is a device that can be combined exclusively with the Topping Pre90, allowing to use more inputs. With the combination of the two devices, you have two unbalanced RCA inputs and four balanced XLR inputs.
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![Albarry Music AP11 Pre-amplifier [2nd hand]](https://www.playstereo.com/20696-home_default/albarry-music-ap11-pre-amplifier-2nd-hand-.jpg)
![Klyne Audio 7LX/B 3.5.5 Pre-amplifier [2nd hand]](https://www.playstereo.com/21916-home_default/klyne-audio-7lxb-355-pre-amplifier-2nd-hand-.jpg)
