Amphere in xpa2 gen2

[Yngve2]

How many amphere can the xpa2 give?

[Deleted]

According to the results of Emotiva's test on their AP (Audio Precision) machine:



XPA-2 Gen2

8 ohms
302 watts RMS @ 0.07% THD+N into 8 ohms
+/- 0.085 dB, 20Hz - 20kHz
Gain - 29.4 dB
SN - 96.4 dB @ 1 watt --- 120.8 dB @ full power


4 ohms
502 watts RMS @ 0.12%  THD+N into 4 ohms
+/- 0.110.5 dB, 20Hz - 20kHz
Gain - 29.4 dB
SN - 93.0 dB @ 1 watt --- 120.0 dB @ full power



Note that these figures above are an average of the Ch1 and Ch2 results.  RMS equals continuous power.  Gain is now down to just above 29 dB's and SN ratios are improved over the Gen1 XPA-2.  This should be one brute of an amp, even better built and very quiet.

 




 

[Yngve2]

Hi, yes i know the watt output,i cant find any data over the _electric current in AMPERE, the XPA2 gen2, gives to the speakers.

Eksample:Electrokompaniet amps, gives almost 1ampere to 1watt in 8ohm.

This high current,makes the amplifire run any speaker with a lot of force and control.

[Yngve2]

Eks:Electrocompaniet aw2*120m max current 100ampere. This is very high current for a 120watt amp. Electrocompaniet aw250r is 250wpch and gives 100ampere to. This is only eksample of two very good amps.
I belive the Emotiva xpa2 gen2, has a lot of ampere to,thanks to its big 1200va,toroidal transformer?

[wizardofoz]

While not entirely accurate as its an inductive load rather than (note the correct use of THAN and not THEN) purely resistive, you can use Ohms Law to get a rough idea of what would be drawn at the rated output into the rated load. Of course this doesnt tell you what the maximum might be, nor accounts for the reactiveness of the load as it is changing all the time based on frequency and cone position.

www.ohmslawcalculator.com/ohms_law_calculator.php

some related info

www.gollihurmusic.com/faq/31-OHMS_AND_IMPEDANCE_FROM_THE_OUTPUT_SPEAKER_PERSPECTIVE.html

[Deleted]

Sorry, I misunderstood your question.  You are maybe comparing somewhat to the Electrokompaniet AW250R which lists maximum peak current of greater than 100A.   I don't know the figure for the XPA-2 Gen2.  The XPA-2 Gen1 had a reputation for being able to drive below 4 ohm  loads easily.  The Gen2  seems to be an upgrade to the Gen1.

Hopefully a member here will be able to help you.  I also suggest you send a PM (private message) to Lounge Administrator and Emotiva staff employee, KeithL.  He is very knowledgeable, super helpful and will know the answer or will get it for you promptly.  Lonnie, VP and Chief Technical Officer would also know but many times he is out of the office.

Look for KeithL in the forum under the Emotiva Staff Commentary section.

[geebo]

Aug 19, 2013 4:37:56 GMT -5 Yngve2 said:

Hi, yes i know the watt output,i cant find any data over the _electric current in AMPERE, the XPA2 gen2, gives to the speakers.

Eksample:Electrokompaniet amps, gives almost 1ampere to 1watt in 8ohm.

This high current,makes the amplifier run any speaker with a lot of force and control.

According to ohms law, 1 amp flowing through 8 ohm takes 8 volts which would equate to 8 watts, not 1 watt. 300 watts into 8 ohms would come out to about 6.125 amps. 500 watts into 4 ohms would be around 11 amps. These are approximate for reasons stated by wizardofoz.

[Dan Laufman]

Output current ratings are a hold over from the amplifier arms race of the 70's and 80's. There are so many misleading ways to rate peak output current, and every manufacturer has their own method to further confuse the customer. It really has no meaning when comparing amplifiers as their is no real standard used.

This is a B.S. rating for the most part. You cannot force 8 amperes of current across an 8 ohm load at one watt. Doesn't work that way. The resistance of the load and the voltage applied across the load determines the current flow. It's very simple, and it's called Ohm's Law. You cannot "force" more current to flow, unless you are a marketing department!

Ask the manufacturer for their detailed test data under both 8 ohm and 4 ohms conditions. Use the Audio Precision (or equivalent) data they provide as a reference point. As an example, you can analyze our amplifiers performance under very rigorous and fully documented conditions to determine their true performance. IMO, you should be able to do the same for an amplifier costing four or five times as much. They should be able to supply this for you,. This data will let you understand the true output power capabilities of an amplifier under the most stringent continuous load conditions. If it can deliver continuous rated power across the full frequency spectrum under various sine wave load conditions, believe me, it has plenty of "peak " current capability.

But hey, what do I know?

Cheers,
Big Dan

[Yngve2]

Thank you for al your answers. I am going to use the XPA2 i am buying to day, on a pair of Infinity Kappa 8.2 gen2. Kappa 8.2
needs a lot of power,to give the great sound they are capable of. I have a Onkyo tsxr 875 and the Onkyo makes the Kappas sound very good, but has a bit to little power in the upper and lower bass.
So i hope the Emotiva xpa2 wil give what the Onkyo dont.
English is not my language,so please ekscuse my writing errors.
Have a nice day everybody

Yngve.

[geebo]

Aug 19, 2013 9:06:40 GMT -5 Yngve2 said:

Thank you for al your answers. I am going to use the XPA2 i am buying to day, on a pair of Infinity Kappa 8.2 gen2. Kappa 8.2
needs a lot of power,to give the great sound they are capable of. I have a Onkyo tsxr 875 and the Onkyo makes the Kappas sound very good, but has a bit to little power in the upper and lower bass.
So i hope the Emotiva xpa2 wil give what the Onkyo dont.
English is not my language,so please ekscuse my writing errors.
Have a nice day everybody

Yngve.

Both my XPA-5 and XPA-2 absolutely trounce my old Onkyo. I think you'll be pleased with it.

[GreenKiwi]

Aug 19, 2013 9:06:40 GMT -5 Yngve2 said:

Thank you for al your answers. I am going to use the XPA2 i am buying to day, on a pair of Infinity Kappa 8.2 gen2. Kappa 8.2
needs a lot of power,to give the great sound they are capable of. I have a Onkyo tsxr 875 and the Onkyo makes the Kappas sound very good, but has a bit to little power in the upper and lower bass.
So i hope the Emotiva xpa2 wil give what the Onkyo dont.
English is not my language,so please ekscuse my writing errors.
Have a nice day everybody

Yngve.

I'm sure it will give you all the power you can handle (unless you're wearing ear plug and in the next house down on the street. )

[Deleted]

Yngve, Welcome to the Emotiva Lounge.  From the feed back we have all heard here at the Emotiva Lounge you are going to love the sound of the XPA-2 driving your Infinity Kappa's.  The most frequent praise I have heard on the XPA-2 is the superb driving power especially for the bass. 

Thanks to Big Dan Laufman, President and CEO of Emotiva, for filling in for Keith!  


Please come back and let us know how you like the XPA-2 Gen2 with your speakers.  Don't worry your English is just fine.   

[leonski]

I'll give dan  Hi Marks for being pretty right on.  NO standard exists for an amps current output.    For steady state conditions, ohms law rules.  Do The Math.

However,  without destroying the amp with some kind of catastrophic short, you CAN measure very high currents for very short time periods.  However, you must stay within the Safe Operating Range of the output devices.  You may be able to get say.....25 amps out of an XPA-2 GII, but it'll be at some very low voltage.  

One ruling factor which NO manufacturer discloses is an amps performance into reactive loads.  2 amps which may perform to within say......1/2db into a resistor may be WAY different when you have a 45 degree or maybe even a 60 degree load  applied.  One amp will do well while the other.....falls flat on it's figurative face.   For those who own speakers which are difficult loads, without regard to how 'efficient' they are (should be sensitive) the choice should be easy.