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Post by Jim on Jul 9, 2012 18:36:26 GMT -5
I don't imagine that ventilation fan (motors) cause much noise. After all, they're small motors... Much like the motors in blu-ray players, cd players, turntables... Just a little larger.
Unless you're running big ventilation fans.
HVAC Blowers and big motors are ones that tend to be more problematic.
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Post by richardrc on Jul 9, 2012 21:57:11 GMT -5
BTW, if you can afford to, no equipment that uses a motor or a dimmer should share your H/T lines  Does that restriction on 'motors' also hold true for audio equipment cabinet ventilation fans I wonder??? It is all about electrical switching noise. Anything that "chops up" or distorts the ac waveform such as switch mode power supplies, light dimmers big electric motors etc. This can directly effect any connected equipment through EMI as radio frequency energy which can be induced into any nearby electric cable, which is why these devices don't even have to be in your house and the next door neighbors pool pump can stuff your T.V. reception!! So to answer your question it depends... on the motor, how it is driven, how big it is, how it is shielded and filtered from the main ac supply. Emotiva use brushless DC motors/fans inside their latest amplifiers driven from a linear power supply (non switching). These fans have a switch or chopper circuit inside them to perform the commutation function, hence the name brushless. So we have a device right in the heart of the amplifier which is performing a rapid switching function and thus producing EMI, BUT the currents and voltages involved are very small and the corresponding EMI would also be very small, infact insignificant to cause any audible noise, through speakers/headphones which are connected to the amplifier. As for the light circuits, at least in Australia, they are run completely separately to the power circuits, but the dimmers can still cause problems as I mentioned before, althought the newer style universal or trailing edge dimmers are much less likely to be a problem. |
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Post by richardrc on Jul 9, 2012 22:16:01 GMT -5
We have 230/250 volts @ 50 hz in Australia, so would a normal 10 amp power point be OK ? Cheers Gary It depends upon what the amplifier will drive either 4 ohm or 8 ohm and how you will be driving it. I am surprised that no one here has brought it up yet. The amplifier has a 3.3kVA transformer so assuming a power factor of 0.8 it would be pulling 37.5A at 110vac or 17.9A at 230vac (hence the 20A 250vac IEC receptacle and why Dan suggest the 220vac supply) Of course it wouldn't be doing this continuously unless you have some other evil plan for this monster!! For most people they will never scratch the surface as to what this amp can do, the 180,000uF will take care of any short comings in the supply, so 10A @230vac dedicated is heaps. |
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Post by Gary Cook on Jul 9, 2012 22:50:19 GMT -5
We have 230/250 volts @ 50 hz in Australia, so would a normal 10 amp power point be OK ? Cheers Gary It depends upon what the amplifier will drive either 4 ohm or 8 ohm and how you will be driving it. I am surprised that no one here has brought it up yet. The amplifier has a 3.3kVA transformer so assuming a power factor of 0.8 it would be pulling 37.5A at 110vac or 17.9A at 230vac (hence the 20A 250vac IEC receptacle and why Dan suggest the 220vac supply) Of course it wouldn't be doing this continuously unless you have some other evil plan for this monster!! For most people they will never scratch the surface as to what this amp can do, the 180,000uF will take care of any short comings in the supply, so 10A @230vac dedicated is heaps. Thanks Richard, have I been doing the kVA to killerwasps conversion wrong? I used to do it as 3.3kVA x 0.8 = 2.64 kW and at 230 volts that would be 11.5 amps (or 24 amps @ 110 volts)? Cheers Gary |
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Post by richardrc on Jul 10, 2012 0:25:56 GMT -5
VIcosØ=VA
where cosØ=power factor
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Post by dragonV on Jul 10, 2012 5:03:52 GMT -5
We have 230/250 volts @ 50 hz in Australia, so would a normal 10 amp power point be OK ? Cheers Gary Should be fine - supply wise. Not sure what Emo is doing in terms of power cords for non-american outlets.. Yes was wondering how and what adaptor/cord etc you would use to connect this in Australia??? Shipping costs and duty here might also be a killer sadly. |
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Post by richardrc on Jul 10, 2012 6:33:36 GMT -5
 This should do the trick from techbuy.com.au (Part Number:161564), note that it is a 15A plug so has a larger width earth blade to a standard 10A plug. |
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Post by Jim on Jul 10, 2012 6:43:31 GMT -5
I used to do it as 3.3kVA x 0.8 = 2.64 kW and at 230 volts that would be 11.5 amps (or 24 amps @ 110 volts)? I believe it would be 3.3kVa / .8 = 4.125 kW (A PF of 1 would mean 3.3 kVA = 3.3 kW) I'm curious what the actual measured power factor is.  |
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Post by RightinLA on Jul 10, 2012 7:45:36 GMT -5
I used to do it as 3.3kVA x 0.8 = 2.64 kW and at 230 volts that would be 11.5 amps (or 24 amps @ 110 volts)? I believe it would be 3.3kVa / .8 = 4.125 kW (because the power factor means that it needs to draw more wattage to get the 3300 VA, A PF of 1 would mean 3.3 kVA = 3.3 kW. I'm curious what the actual measured power factor is. Efficiency and power factor are being confused here. They are separate quantities. |
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Post by Jim on Jul 10, 2012 7:55:05 GMT -5
I believe it would be 3.3kVa / .8 = 4.125 kW (because the power factor means that it needs to draw more wattage to get the 3300 VA, A PF of 1 would mean 3.3 kVA = 3.3 kW. I'm curious what the actual measured power factor is. Efficiency and power factor are being confused here. They are separate quantities. Well I'm still curious about the measured power factor even if you're unhappy with my wording. ;D I was trying to keep my answer short and simple without getting into true power / apparent power, etc. I understand the distinction. |
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Post by richardrc on Jul 10, 2012 8:57:07 GMT -5
I believe it would be 3.3kVa / .8 = 4.125 kW (because the power factor means that it needs to draw more wattage to get the 3300 VA, A PF of 1 would mean 3.3 kVA = 3.3 kW. I'm curious what the actual measured power factor is. Efficiency and power factor are being confused here. They are separate quantities. No confusion, although they are both related to money  as someone has to pay for that wasted energy!! |
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Post by Jim on Jul 10, 2012 10:49:04 GMT -5
Does anyone know how many LEDs each channel has on the meter? 10 or 12?
I'm just curious, as some pictures make it look like it has 5, but I know that can't be correct (looking at meter video, etc).
Edit: I think it's 12 bicolor (red/blue) LEDs.
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Post by danr on Jul 10, 2012 19:19:13 GMT -5
Sooooo...do we have any listening impressions posted anywhere yet?
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klinemj
Emo VIPs 
Official Emofest Scribe
Posts: 15,101
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Post by klinemj on Jul 10, 2012 19:51:26 GMT -5
danr...isn't unboxing and debates over power/plug needed & LED's enough? I mean come on...how it sounds? What's important about that?  OK...so...joking aside...I have to second danr...HOW DOES THE DANG THING SOUND? Mark |
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Post by Jim on Jul 10, 2012 19:55:54 GMT -5
I was asking about LEDs to add to the FAQ......... but yeah, I third the motion for listening impressions!
;D
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klinemj
Emo VIPs
Official Emofest Scribe
Posts: 15,101
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Post by klinemj on Jul 10, 2012 19:58:07 GMT -5
If it's not out of protocol, I will "fourth" it.
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Post by richardrc on Jul 10, 2012 21:06:20 GMT -5
Just a link for Australian customers showing all of the household GPOs, the last two are not common and many sparkies don't know about them, probably because a standard household service is limited to 80A. www.fam-oud.nl/~plugsocket/Australian_3hd.html |
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Post by The Mad Norseman on Jul 10, 2012 21:59:22 GMT -5
And I'll throw my own plea out there too then! Can anyone report back yet as to how they like their new XPR-5? How does it sound? Any 'user practical' info or wisdom to impart? C'mon- give!  |
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Post by Jim on Jul 11, 2012 11:41:56 GMT -5
Apparently the XPR-5 buyers like it so much they've become hermits and would rather play movies and music all day and have no interest in the interwebs anymore!
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Post by monkumonku on Jul 11, 2012 11:48:52 GMT -5
Apparently the XPR-5 buyers like it so much they've become hermits and would rather play movies and music all day and have no interest in the interwebs anymore! I think they will faithfully post a review once they are out of the hospital from having to lift the amp into their racks. |
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as someone has to pay for that wasted energy!!
