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bass face blackdb4.1 - feedback?

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    Posted: 21 March 2017 at 5:24pm
anyone got experience with this?
http://www.bassfaceaudio.co.uk/product/blackdb4-1-4-channel-amplifier/ - http://www.bassfaceaudio.co.uk/product/blackdb4-1-4-channel-amplifier/
 class d, claims 150x4 at 4 ohm and 225x4 at 2, 2 x 450 at 4 ohm bridge, it has got variable hi and lo pass on two channels and just  hi pass or clone of the other two channel flters on the remaining two. could run and process a sub on one side and  tops on the other, making a neat one box solution.
i read bad feedback about it's cheaper sibling db4.2 build quality, any experience about this?
should i trust those rms values?
i can have this bass face for 200 euros new. for 230 i could have a Ground Zero gzha mini four
https://www.rg.it/gzha-mini-four_ground-zero-id-32326. - https://www.rgsound.it/gzha-mini-four_ground-zero-id-32326.html
rated at 4x70 / 4 x 130, tested in germany as 4x67 at 4 ohm and 4 x111 at two - should give 2 x 222 at 4 ohm bridge; hi pass and lo pass on every channel .
i feel 400 watts max should be more than enough for my target and lust to carry batteries (almost 40 amp hour! - i think i could be happy using 20 x 2 for tops and 50 for  two parallel tops, 90 watt 10 amps hour, but like a powerful amp for headroom and  low distortion at low power levels)
i read that amps are less efficent with little output and more efficent at higher output, so using one amp at medium level could be more efficent than 2 at low level.
i know everyone loves pioneer gm d8604 but i  need hi pass for subs...
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