Instruction: Answer the given question using the supporting document.

Input:
Question: How is the bass on this DAC?
Document: What a beautiful sounding AMP/DAC , much better detail and stereo separation than my more expensive portable amplifier.Tonally wise , just right , sweet highs , MIDS and low ,tight and control bass
I found the amp to be lacking bass, it is also takes 4 to 5 hours to charge and only plays for 4 to five hours. The build quality is excellent but it doesn't make up for the short comings. There are better amps for the money.
This amp covered the need for an amp as well as a DAC. The sound is outstanding ! This piece of equipment can make my AKG headphones come to life ! The price was also in the ballpark. Some more expensive tube amps might do better,but you would pay more for the equipment !
Worldwide there are very few direct cable connection options, especially with the Lightning.Enter the SONY PHA-1. It's made to work with the iPhone, including the iPhone 5. It can be used as a straight amp or better yet to bypass the internal Apple DAC/AMP by using the Lightning connection (out) to the PHA-1 USB (in) - one cable, no adapters.
So you get a cleaner connection and sound, and it offloads to the amps built-in DAC to handle the sound processing. With the FiiO,you may be doing a line out of your idevice, but your still inputting analog into the amp, not digital.I can't compare this to the Fostec, it is far better than the FiiO line of DAC/amps. I'm not saying the FiiO's are bad or horrible, but they just can't stand up to constant daily usage.
obvious improvement after I use it in my ipod classic, I love IPC because it have a big volume to accommodate my music, but I need a improve it audio quality, the PHA- 1 is the best choice.
You can now find the Sony HPA1 from Sony's own website, but for something like $500 or $600. You can get it shipped from Japan for around $400 with shipping. It's the exact same device, the only difference is any only documents are in Japanese. You can find the English versions on the net, but they really aren't that necessary.
This amp works great when used as a desktop amp and remove the factor of battery time when used on mobile device. Average battery time for this product should be around 5 hours, however, the best time i got after fully charged is no more than 2 hours which is so annoying! I could not take a power bank with me just for the amp! Thus in the end I decided to return it
They limit access to the volume knob. That's the bad news, the good news is four screws will remove them.Enough said. It's a great combo for any smart-phone / iPod / iPad etc. It's not cheap, but you get what you pay for and the SONY PHA-1 is worth every nickel and then some.Update - 5/27/13The more I listen, the more I love it.Undocumented tip - The Power LED is green when you turn it on.
The product seems to be opened before, and the headphone adapter is gone, excellent quality tho. It would be awesome if you can send us the missing adapter. Thx
Answer: It is plentiful , tight , controlled , not better than my big desk top amps but really good in general. I recommend this DAC amp greatly