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I'd need to know what mixer you have, to know if there is a [line out] connection socket and an [internal amp in] connection socket.
"each with own poweramp" I presume means the ep1500's and NOT that the speakers are active (ie containing amps)
***If any of your speakers are active, ask the question again, with more detail.***
So if all your speakers are passive, I offer the following.
I assume there is [effect send] and [effect return] on the mixer
effect send>quadraverb>effect return
mixer line out > eq > compressor > sonic maximizer > crossover
sub output of crossover> amp > sub
high output of crossover to mixer's internal amp input
mixer's speaker output > main speakers
monitor output > other side of eq (>other side of compressor if desired, but use sparingly ) > other side of sonic max if it is true stereo , otherwise skip > amp > monitors
If your mixer doesn't have an input to its internal amp, we are "back to the drawing board"
With questions like this it pays to give as much detail as possible; model and make of each component etc
I have done my best with the the info you have provided.
Don't feed amp outputs into powered speakers
1. The needle is not inserted correctly
Remove needle & reinsert needle( flat side towards the back of machine)
2. The needle is damaged
replace with new needle
3. The wrong size needle is being used
Choose a needle to suit the thread & fabric
4. The foot not attached correctly
Check & attach correctly
bird nesting problems
Try these suggestions
1. Change needle
2. Rethread the machine--top --make sure to use every thread guide
3. Take the bobbin out --make sure it is inserted correctly into the bobbin
Case, & make sure the bobbin is turned the correct way
4. make sure the thread has not come off the thread take up lever
5. Clean under the needle plate & in the bobbin area for lint or threads
The needle thread breaks
1. the needle thread is not threaded properly
2. The needle thread tension is to tight
3. The needle is bent or blunt
4. The needle is incorrectly inserted
5. The needle thread & the bobbin thread are not set under the presser foot when starting to sew
6. the threads were not drawn to the rear after sewing
7. The thread is either to heavy or to fine for the needle
firstly are you using a regular twin needle on a knit fabric? this could cause skipped stitches.
is the twin needle quite old and possibly blunt?
Is the Hobbymatic a model that requires a slanted twin needle, there are two types of twin needles as the computerised machines need the offset style. You can distinguish between them by the plastic block on the needle shaft where the twin needle points are set, either red or a deep brown colour.
If none of the above apply, then it is possible that the timing sequence is slightly off so that one of the needle's thread is not getting caught during the stitching.
Timing is an adjustment that I leave to the technician to address. But if you want to have a go yourself there may be some videos on you-tube for your model and how to make this adjustment to it.
A sewing machine operator can often help themselves when their machine does not operate properly. Here are some simple instructions, which if properly used can save time and mechanics service calls. TROUBLE;UPPER THREAD KEEPS BREAKING; This could be trouble;================Do this; 1.Top tension to tight================loosen tension 1 turn 2.Machine improperly threaded=========check threading 3.Thread twisted on guide post========" 4.Thread twisted out of tension=======" 5.Take up spring bent or broken=======Check action of spring 6.Thread jumped off pull off finger===Check threading 7.Needle bent or burred===============new needle 8.Bad cone of thread==================try another cone TROUBLE;LOWER THREAD KEEPS BREAKING; 1.Bobbin tensionspring to tight=======Loosen tension slightly 2.Bobbin threaded wrong===============check threading 3.Bobbin wound to tight or uneven=====try new bobbin 4.lint or thread on bobbin case=======clean inside case 5.Lint or thread inside hook==========clean inside hook 6.Bobbin case nicked bent or burred===check/change case TROUBLE;MACHINE STARTED SKIPPING STITCHES; 1.Needle bent or burred===============change 2.Needle set in crooked===============Check 3.Thread jumped off take up spring====check threading 4.Thread jumped off pull off finger===check threading TROUBLE STITCHES SHOWING LOOPS; 1.Forming loops on top of cloth=======Tighten bobbin tension ======================================or loosen top tension. 2.forming loops on bottom of cloth====Tighten top tension 3.Bobbin placed in case incorrectly===remove and replace 4.Bobbin thread slipped from under====check threading of tension===============================bobbin case 5.Lint or thread in top tension=======clean between tension discs
now that is strange. check your thread, now take that twin needle and try this, shove it very hard up into the the needle holder. my thought is that it is not up enough. because your problem is exactly what would happen should the twin needle be sitting too low. try shoving it up higher and test again.
The selector knob may be a potentiometer or a rotary impulse giver device. In any case, it looks like the internal contacts are either dirty or oxydized so the value is changing in an erratic way which causes the unit to skip several presets at a time.
It would require a skilled technician to disassemble and clean the controller (if it can be disassembled in the first place), otherwise you will probably need to replace the preset selector knob entirely.