How to fix problems on the Gemini PA 7000

You need to take it to the shop and get the switch replaced. It shouldn't cost more than an hour's labor/bench charge and the cost of the switch. Depending on your market probably $75-100.

I have a Gemini xga 4000 that only channel 2 works fine but channel 1 is very very low .......

What kind of preamp and how are you using the xga, I assume on PA, and you want to use maybe a guitar preamp and amp head directly to it? Your preamp could go straight line in to the xga, the only thing the (whatever kind) of head is for power of onstage monitoring of your guitar. That is optional since the PA should have monitors. I personally use my full rig onstage to hear myself but, I mic it to the PA which always sounds better than direct. If you could be more specific to these models and uses or ideas, I could help you more.

Can you elaborate? What do you want to connect it to?

The problem is you have an ILLEGAL connection based on proper electronic design. This pedal has UNBALANCED high impedance interconnects and the output of your mixer and the PA SHOULD be BALANCED low impedance interconnects. This makes the system subject to noise and you may even get static discharge noise. Also verify that the TASCAM and the PA system are ALL powered from the SAME receptacle or power conditioning module. This is a tough design problem to achieve what you want. Essentially you want to make the master gain of the TASCAM on a foot pedal as I understand it. There is one pedal that CLAIMS to have balanced in and out and if I had the schematic I could verify it... but I could not find the schematic in my searches... look at: http://www.sweetwater.com/store/detail/StealthPedal
This one MIGHT do the job right. You MUST use TRS BALANCED cables, NOT TS, from the mixer to this and from this to the PA. Do research on BALANCED and UNBALANCED and TRS and TS and also XLR cables using google to understand the difference and importance of using balanced interconnections in your system. I would try to get one of these pedals on approval with the correct cables and test it.

Did you have the same speakers you test with at the store? If not, that is the problem. This unit will generate 400 watts a side when used on 4 ohm speakers, and a little over 200 watts a side with 8 ohm speakers and about 120 watts a side with 16 ohm speakers. For mics, the trim controls will be between 3 o'clock and full right. You set these using the PFL button with loudess vocal such that the indicator does not reach into the clipping. Do this for each channel. ALWAYS use balanced lines where possible. Use of unbalanced cables input results in a 6 Db loss. You will want to run the channel and main faders normally in the 80% range, like between -5 and 0 for BEST signal to noise ratio. There are good videos on You tube about mixer setup. If the speakers were not the ones tested with, your speakers may be the problem... I HOPE they are NOT consumer stereo speakers as you will soon smoke them with this mixer... the consumer speakers are very inefficient and you won't get much sound before blowing them up. If you spent less than $300 for EACH EV speaker new, it is UNLIKELY they are suitable. The suitable ones I found for 12 inch are around $600 each...hopefully these are the ones you have. There are less expensive brands. Frankly, if you want more sound, especially bass, I would go up to 15 inch speakers. These are probably the lowest end price wise to consider: http://www.musiciansfriend.com/pro-audio/behringer-b215xl-15-1000w-passive-pa-speaker Shop around, but stay with PA rated pro speakers as consumer ones just won't take it and eventually fail when used with these amps. ALSO be very careful if you use 1/4 inch speaker plugs as the SLEEVE of the A channel of this amp is the HOT, not the TIP of the jack... short the sleeve to something grounded and it is goodbye amp.

Connection all depends on what type PA system you have. Here are the rules: Power this device from the SAME receptacle your mixer is powered by, even if it means running an extension cord. Use ONLY a balanced line from the mixer... either TRS cable or XLR cable.

This is far from normal. What may be the problem is a component on the circuit board itself. You may have to take this to someone who has a multimeter to test and see which one it is (this may take a while, since there are a LOT of small components). If you don't want to (or have the money to) do that, you can just set the balance to the opposite side of the louder speaker until it sounds even out of both channels. Eventually, though, something will have to be fixed.


Hope that helped!

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Proper level setting of the mixer is important. HOWEVER if the clipping is occuring at the speakers the only possible problem MIGHT be that you have a supersonic feedback that is saturating the speakers above your hearing range, Be sure you don't boost the highs too much with the EQ as this can cause the feedback that you can't hear. Also make sure that you power the speakers from the SAME receptacle as the mixer, even if it means running an extension cord to bring power to the mixer. This is to avoid a low frequency hum and common mode distortion/damage. A low frequency hum could cause the clipping.
It would be a good idea to get a sound meter to check the sound level. You should be able to reach 85 Db from this system without clipping. If you need more than that, you MAY need more speakers if the band instruments are too loud. Also if the band has amps that get into the vocal microphones that adds to the clipping level... make sure the mics don't "hear" the band instruments. Make sure your speakers are toward the audience from the mics to avoid the supersonic feedback problem. If the vocalists can't hear themselves with that configuration you need to set up seperate stage monitors.

There are some pretty good videos on YouTube about proper mixer level setup.

Several things to check:

If the speakers are cut off when externaal cables are connected to line outs, possibly the jack sensing switch for the right channel thinks that a plug is in there... you might cycle one in and out to see if that might fix.

Another thing is they LIKELY have a PAN control setting and it might be set full left. The external MP3 would NOT be under PAN control, only the keyboard voices would be affected by it.