New speakers don't sound good

RonRizz

No. The resistance in ohms you are running is dictated by the speakers (or load on the amplifier). Your set being 2.7 ohms will give you a slight increase in output, and a slightly bigger draw on your amp, but not enough to cause the amp stress.
it sounds to me like they hooked the tweeters to the crossover (or they would have fried by now) but bypassed the crossover and ran straight from amp to the woofers. Without a high pass filter on the amp (or without it on and set to a high enough frequency) your poor little woofers may be seeing down to 20HZ. Alot of music out there wont reach that low, so you only distort, or get sloppy on certain tracks.
Let us know what comes of it.

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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals