Hi my mackie thumps 100 watt aren't delivering a decent volume ,,I,m using mackie mixer please help

Question edited for clarity

https://elektrotanya.com/mackie_thump_th-15a_sch.pdf/download.html

Or contact Mackie direct
https://mackie.com/sites/default/files/PRODUCT%20RESOURCES/MANUALS/Owners_Manuals/Thump12A_Thump15A_OM.pdf

..

See my previous answer. Service Locator Mackie

Don't even go there. In my experience these are just not reliable speakers, we have had and heard of so many issues with them we sold our working ones. If one has gone sell the other working one with the dead one as spares and repairs and buy something from QSC, EV, JBL or Yamaha or even Wharfedale Pro.

You should return it, that's what the warranty is for. Don't even think about trying to sort it yourself

Balanced audio interconnects (either XLR or TRS cables from the mixer and then balanced audio interconnects from the amp daisy chain inputs to the existing speaker inputs. If the amps do not have linked input jacks, then use TRS type WYE connectors at the inputs. Then use speaker rated cables from the amps to the passive speakers.

You failed to give us the most important information... what brand and model of the mixer? Youwill use balanced interconnect lines to a balanced MAIN output jack, assuming it exists...

Use balanced lines for the audio interconnects. Use XLR low noise mic cables or TRS type cables. IMPORTANT: Power the speakers and the mixer from the SAME receptacle, even if it means running extension cords. Ground bounce in building wiring can destroy the circuits in the equipment.

You may be getting a small amount of cross-talk. How high are the gain settings and sliders when this occurs? Also, can you describe the overall setup that you are using? I'll check the prints, but you should not be getting any volume unless the gains are maxed.

Dan

how u hook up a mixer

If all other functions work for those channels, the most likely problem is the fader itself. These can fail and operate more like switches rather than faders. Without witnessing the behavior, I can not state that for sure. While these mixers are not the hardest to work on, they are time consuming. The faders can be purchased from Mackie directly. If you need to have this repaired, any shop that repairs audio gear should be able to erpair this for you. Where are you located?

Dan