theguitarfreak

Upgrading to crown amps, help with choosing for my setup

41 posts in this topic

Hmm, thank you. Should I better change this parameter back to 600W?

I'm not sure but I think you have a small yet very common misconception. The way we hear sound makes us think the change from 1W to 10W is precieved the same as going from 1000W to 10000W, so 600W is not so little!!

That depends on how much headroom you need, 600W would give you just a bit under 12dB, you should be fine with just 12dB, if you run into the limiters or if the clip light is on too much then it means it wasn't enough and you should adjust it for the next show.

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Added a comment about the headroom, was everything clear enough?

Avi

Thanks a lot Dakos. Its more or less clear. I have two systems in my company. One indoor system where we use VRX and for outdoor shows we use DAS Aero 50. I ordered MA5000i for running the VRX. I will be running 2 VRX932LA coupled running at 4 ohms from one channel of MA5000i. I know the speakers need an rms power of 1600w at 4 ohm so ideally my amp should be 3200w per channel to provide peak headroom. But I think I will have to go with the 5000i which is 2500w per channel due to budget constraints. So going by this what do u think should be my rms and peak limiter settings on the amp so I get the max headroom without burning the coil.

Dear theguitarfreak,

The peak limiter for 1, 2, 3 ,4 or whatever number of speakers connected in parallel is the same, you saw the calculations we did for Peter so either choose the 131V or 113V, you'll have a bit better protection with the 113V.

As for RMS limiting and headroom, headroom is something you create by the way you configure your rig, the need for different headroom settings depends mostly on the type of music you play, so what type of music do you intend to play?

Avi

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Added a comment about the headroom, was everything clear enough?

Avi

Thanks a lot Dakos. Its more or less clear. I have two systems in my company. One indoor system where we use VRX and for outdoor shows we use DAS Aero 50. I ordered MA5000i for running the VRX. I will be running 2 VRX932LA coupled running at 4 ohms from one channel of MA5000i. I know the speakers need an rms power of 1600w at 4 ohm so ideally my amp should be 3200w per channel to provide peak headroom. But I think I will have to go with the 5000i which is 2500w per channel due to budget constraints. So going by this what do u think should be my rms and peak limiter settings on the amp so I get the max headroom without burning the coil.

Dear theguitarfreak,

The peak limiter for 1, 2, 3 ,4 or whatever number of speakers connected in parallel is the same, you saw the calculations we did for Peter so either choose the 131V or 113V, you'll have a bit better protection with the 113V.

As for RMS limiting and headroom, headroom is something you create by the way you configure your rig, the need for different headroom settings depends mostly on the type of music you play, so what type of music do you intend to play?

Avi

It will mostly be loud rock bands and DJ playing.

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DJ playing is not a problem, loud rock bands is a completely different story, you need more SPL and more headroom, about 15-20dB, so it depends on how far your audience is from your speakers and if you're playing indoors or outdoors.

I would suggest you read this thoroughly:

http://www.crownaudio.com/how_much_power.htm

It is very summarized and "to the point" article for exactly what you need.

Also use this calculator:

http://www.crownaudio.com/elect-pwr-req.htm

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Hi,

after some time of using iT 8000 with 6 VRX 932 some technical problems came with the amp. So now I have to make a decision, what will be my next step. So far I would like to try bi-amp wiring for my VRX's.

Will anybody give me a piece of advice what amp to choose?

As my iT8000 is half gone (one channel woks, the other doesn't sometimes, but sometimes does...) All that I can use is 2x XTI 4002 so far.

What amp should I look for?

Thank you for any help

Peter

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Dear Peter, how are you?

The replacement amp depends on how much you want to spend?

The cheapest option and still achieve biamp would probably be to fix the broken 8000 and get another i-Tech to run your HF drivers, even the 4000 is enough.

You can go the more expensive route and jump to the HD series amps, then the obvious replacement for the i-Tech 8000 is it's successor, the i-Tech 12000HD for the 6 boxes and for the HF drivers the 5000HD is the current replacement for the 4000. In this case I would still try to fix the older 8000 and put it on the subs instead of the two XTi's.

Did I understand you correctly?

Avi

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Hallo Avi,

nice to hear from you.

Thank You!

You understood well.

Actually I forgot to say, I have two spare XTI 4002s.

Any chance on using them on HF in case of successful repair of iT8000?

Peter

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Hello Peter,

Do you need some help with the IT8000 repair? If so, please describe your issue.

A.

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I thought you were powering your subs with the two XTi's, did something change? What are you powering your subs with now?

Yes, even one XTi would be enough to drive the HF drivers of three speakers per channel power wise. Limiting wouldn't be as good though since the XTi's have only one limiter in their DSP Vs two limiters on the older i-Tech Vs three limiters on the i-Tech HD.

If you have two spare XTi's, sell the two of them and buy another i-Tech. I believe you'll even have some spare change left and a bit more SQ. Is this a valid option?

Avi

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You are right, I still use my old XTI 4000's to power my two SRX 728S but there are two more amps (2x XTI 4002) available..

As you said before, the option with 1x iT5000HD and 1x12000HD or 1x iT9000HD??? would be very nice, handsome, beautiful.. Now the low budget issue takes place again,..

So

1. repair it8k

2. buy one more xti4002 for HF

will think about it for a while.

I'd love to get those HD's anyway..

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Hello Peter,

Do you need some help with the IT8000 repair? If so, please describe your issue.

A.

Thank you for your offer. First I'll try to let my Crown amp supplier repair my iT8k.

The issue is that when I switch it on, everything works as is supposed. Let's say the sound check of a band is over and the gig is to start shortly. When first sound comes out from my speakers after some time of silence between soundcheck and gig, one channel works fine but the other one "is very quiet". If I rise my master fader a bit higher, this quiet channel starts to work suddenly as it is supposed. It just needs some more signal to break the "gate"..

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1. repair it8k

Yes, definitely.

2. buy one more xti4002 for HF

No, I thought you already had two additional XTi's available, one XTi 4002 is enough for all six HF drivers, that leaves one spare XTi. What I suggested was to sell the two XTi's and buy another i-Tech for about the same money.

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If you are handy with a soldering iron, I would initially recommend that you resolder the BCA coils : Open the top cover; Locate the BCA coils : located towards the fron of the unit; Remove the two coil assemblies from the chassis; Remove the old solder and replace with lead free; Make sure that the coil leads extrude about 2 to 4 mm before resoldering! Re-install the coils.

Alain

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Hi there,

new amp just arrived! I-Tech 4x3500 HD

speakers are the same ( 6xVRX 932, 2xSRX728S)

so I'm fighting with presets again

when using default setup no. 39 from VRX900 Passive V5 R1 set called "VRX932LA-1 3x LT 80 / VRX918S" I'm not able to edit xover, eq and delay ..

should I start with my own preset from scratch or shall I somehow modify this setup? If so, then how to unlock it? When I make a copy of this preset, it's still locked..

Output limiters are set to 169,1V PEAK, 60V RMS.. and no attack parameter, just release set to Manual.

Any ideas please?

Thank you

Peter

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