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Old 22nd September 2012, 06:26 PM   #161
4real is offline 4real  Netherlands
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But CxD300 does not have balanced inputs, CxD400 and the stereo amp does. The question is: what actual use is it, since the IRS has single ended input?

Last edited by 4real; 22nd September 2012 at 06:31 PM.
 
Old 23rd September 2012, 03:29 AM   #162
4real is offline 4real  Netherlands
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... Well, one of the uses might be high impedance. What are the input impedances of all the amps?
 
Old 23rd September 2012, 03:09 PM   #163
Cristi is offline Cristi  Europe
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CxD400, CxD250-HP and IRS2092 Stereo amplifier have balanced input, with input impedance 20Kr. CxD300-8R and IRS2092 modular amplifier does not have balanced input and their input impedance is 3K. Their input need to be buffered to provide matched impedance. There are several advantages of using balanced input, the noise imunity is higher, and in multi-channel designs the GND loop effects can be easily avoided or reduced if one of the inputs, usually inverted one is tied to GND at the signal source point. Also it allows easier BTL connection by simply swapping inverted input with non-inverted input of one of the channels which has to be 180* out of phase.
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Old 25th September 2012, 05:14 AM   #164
4real is offline 4real  Netherlands
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Thanks Cristi, so I'm back at CxD400 or Stereo amp. Can you give us the gain values of the different amps and power options? I'd like to know to match the right gain with the miniDSP output.
 
Old 25th September 2012, 06:27 PM   #165
Cristi is offline Cristi  Europe
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The voltage gain for CxD400 400W version is 33.5 or 1.2V input signal sensitivity for full output power. values of gain in range of 28 to 40 (input sensitivity of 1 to 1.4V) can be set by changing the value of one or two resistors.
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Old 26th September 2012, 05:06 AM   #166
4real is offline 4real  Netherlands
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The CxD400 does only list one supply voltage range. Is that for both 200W and 400W versions?
And what about the gain of the Stereo module?
 
Old 27th September 2012, 01:59 AM   #167
Cristi is offline Cristi  Europe
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yes. same supply voltage for 200W on 8R or 400W on 4R. same gain for stereo module too.
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Old 27th September 2012, 03:16 PM   #168
4real is offline 4real  Netherlands
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Thanks Cristi, I think I'll go for the (4x) stereo modules with SMPS800R@60V PSU (2x)... I will probably be ordering in a few weeks, can't wait to compare with my current UcD400
 
Old 28th September 2012, 07:43 AM   #169
zog666 is offline zog666  Australia
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That CxD250-HP amp modules looks really nice, I enjoy my lower cost irs2092 modules from another vendor (powered by a Connex SMPS), these look even better.
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Old 28th October 2012, 07:52 AM   #170
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Hi Cristi, I've received my four CxD300-8R modules and my two smps500r power supplies - thanks. I plan to install two modules and one power supply in each of my active speakers. Do you recommend putting the electronics in a metal enclosure or can I just bolt them all to one of the wooden inside walls of each speaker?
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