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Hi guys! I'm new Here and I want to share my experience with my 2 IP200's in a wedding.
I run a four piece Chamber band (2 Violins, cello and piano) through an XR-18. I've used this setup with an Inuke3000 DSP + two Peavey's PR15 for years. Past weekend was the great first time of my Turbosounds in real life. It was and outdoor venue for 200 people in a wedding reception.
I must confess that I was so confused, when I was getting some "distortion" from the columns at relative low volumes. I tried everything: changed cables, channels, played a little bit with the gain structure, with the Eq presets, and the result was the same: when I raised the volume as it was supposed to be, there was a lot of crancking distortion everywhere.
I said: ok, I am doing something wrong and I just can't figured it out right now, I saved the night playing in a relative low volume with ocassional distortions.
Back in my house I started to check what was going on. I've also tried to connect my Yamaha P140 directly to the ip2000, without any mixer... The response was the same. If I play "loud" the system makes a painful sound of distortion, specially when you attack a note in a FF staccatto. It is like the DSP of the Turbosound just can't handle it.
In the other hand, if you play some music through the mixer or via Bluetooth those crancks never happen and the system can get really loud, clear and it sounds wonderful!!!
In short, I'm really afraid about have made the biggest mistake in my life buying this equipment... I have a little concert next week and I'll take my Inuke + Peaveys just in case...
PS: I think that I've tried everything in the Gain structure: Low output levels from the XR, the A input in 0db and the Master of the turbo in +10.
Played getting a hotter signal both, in the xr and in the A input, with a lower level in the Master...
The same configuration with the different modes of EQ and position, getting the sub louder and in 0db...
Do you have any thoughts? I've read all the previous posts and I think that other guys have experienced the same that is happening with my Turbos...
The input should be able to handle +22dBu without distorting. Full power should occur at a nominal 4dBu nominal as long as the DSP is configured properly. The output of the XR18 is +4dBu nominal, +16dBu max so it is well matched to the IP2000.
The amount of clean volume the IP2000 can produce should be the same regardless of whether you are using the line inputs or the bluetooth. The DSP has three gain controls Input, Volume, Subwoofer and all should be initially set to 0 dB. This is straight from the quick start guide. With these settings, the IP2000 should get plenty loud before your mixer's output meters go into the red.
One thing to keep in mind, the max SPL an IP2000 are capable of producing is only 123dB. Although I wouldn't expect this to be a limiting factor with the ensemble you describe, it is well below the max SPL of many quality 12 + horn PA cabinets such as a QSC K12.2. I would think the IP2000 would be a great choice for you application
If the IP2000 is distorting too early with the settings at 0 dB, then either the inputs are blown, the signal being sent to the IP2000 is distorted, or perhaps something is wrong with your cables. Another possibility that I have seen mentioned is the connections where the speaker components go together.
I suggest setting your IP2000 with the Sub and Volume at 0 dB and turn the Input all the way down. Run music through your mixer with it peaking just under the red on the output meter. Confirm the sound is clean in your mixer with a pair of headphones. Slowly bring up the Input on the IP2000. Is the signal distorted right away? If yes, how low do you have to run the output of the XR18 for the distortion to go away. With this setting, what happens when you increase the level of the Input on the IP2000?
I had some distortion in my unit during loud male vox at times. I sent them in and they came back passing the specs according to tech support. One did have a screw rolling around inside.
Tell me are you daisy chaining the two from one to the other or sending a left to one side and right to the other?
I did determine that the pass through side for each channel can actually be used as a turn around like the QSC speakers have but I stopped doing that in case it was the cause of my male distortion. The distortion seems to have gone when I got them back.
FWIW I run the main in on the IP2000 at 5 right now and the channel is at 0. My subs are at -3 but that is because I generally two of my EV 12" subs for the bass and kick. I aux feed my subs to them.
I found another thread online about a 2 piano act that was having an issue with distortion after playing awhile. I am not sure if they ever resolved it.
I returned that unit a few months ago. Noe I have two Turbos that don't make that painful rattling noise. For the time being "fortunately" I only have to deal with the unpleasant crackling sound...Try taking the top sections off and shake? I had a loose screw in mine, was making the same noise.

I missed the thing of the "Connections where the speaker components go together" Where was that?

Very happy to mention that I got all the guitar players to turn their amps away from the audience
Here is another shot from a different angle.