# New TOL A&K DAP : the AK Ultima SP1000

Discussion in 'Portable Source Gear' started by Toolman, May 15, 2017.
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1. My comments on the amp after using it a few days and what has changed, negatives and positives of the amp

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2. Does anyone know how to calculate the power of this amp in mw for a 32ohm headphone?

3. I like your review but you got to use good gear with it....cables etc. My rig is set to take full advantage of this amp and I will tell you it drives the SP1000 very well and your right on the clarity... I love it. I was worried I was going to have an issue and start looking at other amps that would not be so form fitting...I'm so happy this worked out, HD800 bliss finally we have power! Now I have a nice contained portable high end music source to take everywhere....okay now to get it insured lol...

Last edited: Jul 17, 2019
4. You would need to send it in to our EU repair center in Germany. I will PM you with more info.

5. The formula for Wattage conversion is:

Wattage =(Volt)(Volt)/impedance

And in your case it will be:

10V X 10V divided by 32 Ohm = 3.125 Watt

The above is based on high gain and balance out which is rated at 10 vrms

For unbalanced and high gain, or for low gain and balanced, the rating is 6.2 Vrms, the Wattage will be:

6.2V X 6.2V divided/ 32 Ohm = 1.2 Watt

Last edited: Jul 17, 2019
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6. a BIG thank you from all the other non-electrical engineers among us!!

7. Thanks for that, I know there are online calculators, but the thing that threw me off was that the specified ratings were based on "condition no load". I didn't quite know how to calculate in that case.
Are you sure you're correct? That's very capable desktop levels of power.

Last edited: Jul 17, 2019
8. @dcfac73, the following is a discussion I had on another thread.

“Condition No Load” Is a number and a known variable just like Zero is a number. When the resistance is known as in Ohm then you can convert it into wattage. Because of my interest in the Khan Cube I wanted to know exactly how much power (12Vrms) are we talking about, I specifically consulted an electrical engineer from IIT, those were the numbers we came up with under different loaded conditions. Remember from no load which is zero to different loading like 30 ohm or 60 ohm is a known linear variable that can be used in the conversion. I will post the formula for that conversion when I return home later today.

As for the unit measurement of root means square (RMS) it refers to the measurement of constant and sustained power supply as oppose to the common term of maximum milliwatt per channel that is based on peak to peak calculation. So 250 milliwatt per channel may actually mean that the channel is capable of reaching up to 250 mW even for a split second but in actuality it may be running only 200 mW on a constant basis. On the contrary, when root means square is used as a measurement, it is only talking about average power supply for a given channel, it is not talking about maximum capability and in fact for any root mean square you can add a factor of 0.719 to the measurement representing headroom or swing for that channel. Let say for instance a 6 Vrms into 30 ohm will give 1.2 watt of average driving power, but in times of need for dynamic swing like when the cannon in 1812 concerto kicks in, it can go up to 1.7 watt as maximum power with an additional factor of 0.719.

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9. As usual, you're the man.
Thanks!

10. Just received my amp yesterday, my question is do you think it would benefit from any kind of break in? I would think at least 100 hours but that’s based on what I would more than likely give to a new DAP.

11. @JasonNYC, I put my 1TB Sandisk card in 2 different SP1000 in a store and they couldn’t recognized or read the card that has been formatted and filled with music. Does it require an updated firmware to read the new card? But my three years old Sony 1Z can read the new card no problem. Will the SP2000 read the 1TB card when it comes out? By the way it looks like the SP2000 is delayed to September now according to an authorized dealer.

12. Should be no issue at all using the 1TB cards. We have been using them here in our US offices since they were first released. Our HQ team is currently testing them before we announce official support. We have found a bug with the KANN CUBE on the latest firmware with the 1TB cards that should be fixed in the next firmware, but no issue with SP1000. We recommend formatting as FAT32 for best results and compatibility.

13. Thanks I will check with the dealers again.

14. Got my sp1000 amp but I can’t get it to work on my sp1000.

I have the latest firmware and have tried everything to get it to turn on. When trying to enable the amp from the swipe down menu it doesn’t seem to recognise the amp. The amp icon is in grey and when pressing it nothing happens.

Borrowed another SP1000 and it worked straight away. Made sure both settings on both SP1000 were the same.

@JasonNYC, Could the issue be fixed with a reset, or is my unit faulty?

Last edited: Jul 20, 2019
15. @JasonNYC is there any difference ( sound wise) aside from color match if I pair SP1000 amp CU to my SP1000 SS? Vs SP1000 SS amp to my SP1000 SS?
Thanks.

Last edited: Jul 20, 2019