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Crown vs Lab Gruppen

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ceharden View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Topic: Crown vs Lab Gruppen
    Posted: 10 May 2019 at 11:47pm
Here's one for you:

A live music venue needs to power (bi-amp) a pair of EV Eliminator/ Shuttlesound Motivator 2x15" + 2" mid-high cabs.  They have available:

Crown Macrotech MA2400 and MA600
3x Lab Gruppen LAB1600

I'm not interested in any comments about buying other amplifiers.  What configuration would you choose?  Some of them have already been done in the past.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FOO Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2019 at 12:25am
Depends on sound quality vs spl/Grunt requirement. 

Best sound = LAB1600. Two bridget on 15", and one in stereo on 2".
Most grunt = MA2400 on 15", and one LAB1600 on 2". Maybe two LAB1600 bridget on 2". 
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ceharden View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2019 at 12:31am
The LAB1600 and MA2400 have the same power output into 4R on paper (about 800W).

The venue was originally running MA2400 and MA600 until they changed to bridged LAB1600 on the midrange.  The current house engineer is worried that it's too much power (about 1600W @ 4R bridged) as the drivers are a bit on the vintage side.

I'm going to suggest that they run one LAB1600 per side, midrange on one channel, HF on the other if they don't want to run bridged.

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Chris Grimshaw View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris Grimshaw Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2019 at 11:37am
Originally posted by ceharden ceharden wrote:

I'm going to suggest that they run one LAB1600 per side, midrange on one channel, HF on the other if they don't want to run bridged.



Good idea. Drop an amp behind each cab and you keep the speaker cables nice and short.
That said, there's nothing wrong with too much power so long as the limiting is up to scratch.

Chris
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Post Options Post Options   Thanks (0) Thanks(0)   Quote csg Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2019 at 6:54pm
Originally posted by Chris Grimshaw Chris Grimshaw wrote:

Originally posted by ceharden ceharden wrote:

I'm going to suggest that they run one LAB1600 per side, midrange on one channel, HF on the other if they don't want to run bridged.



Good idea. Drop an amp behind each cab and you keep the speaker cables nice and short.
That said, there's nothing wrong with too much power so long as the limiting is up to scratch.

Chris

Not such a good idea in an install - speakers are usually flown, and the air is usually warm and dirty / full of smoke or haze. that's why every good install has its amplifiers in an amp room / plant room / office etc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2019 at 9:01pm
Originally posted by csg csg wrote:

Originally posted by Chris Grimshaw Chris Grimshaw wrote:

Originally posted by ceharden ceharden wrote:

I'm going to suggest that they run one LAB1600 per side, midrange on one channel, HF on the other if they don't want to run bridged.



Good idea. Drop an amp behind each cab and you keep the speaker cables nice and short.
That said, there's nothing wrong with too much power so long as the limiting is up to scratch.

Chris



Not such a good idea in an install - speakers are usually flown, and the air is usually warm and dirty / full of smoke or haze. that's why every good install has its amplifiers in an amp room / plant room / office etc


Not to mention that the actual power loss on even 2.5mm cable is basically negligible Vs thermal compression unless your run is over 40m long
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2019 at 10:08pm
The amp room is directly behind the stage.  The cable run is about 5m to one stack, 10m to the other.  Not an issue.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Elliot Thompson Quote  Post ReplyReply Direct Link To This Post Posted: 13 May 2019 at 5:16am
Originally posted by ceharden ceharden wrote:

  The current house engineer is worried that it's too much power (about 1600W @ 4R bridged) as the drivers are a bit on the vintage side.




When you hear a client says this, never offer more power. If anything goes wrong, the client will put the blame on you. The Crown Macro-Tech 2400 (On the bench) should give you anywhere from 950 – 1000 watts per channel @ 4 ohms RMS pending on how much current you have available.

 

Best Regards,

Elliot Thompson
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris Grimshaw Quote  Post ReplyReply Direct Link To This Post Posted: 13 May 2019 at 10:21pm
Originally posted by toastyghost toastyghost wrote:


Not to mention that the actual power loss on even 2.5mm cable is basically negligible Vs thermal compression unless your run is over 40m long


Yep, fair point. In this case, I agree that the practicalities should outweigh chasing that last tiny bit of performance.

Chris
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