Denon 2000, confused with amp/dac info

[Folex]

I used to think the denon's did not need an amp until I got the Fiio 5. I know its not the best amp or even close but with it I notice a difference with the denons. They sound smoother and more satifying. 
 
This is the part I don't get, denon's freq are 5~45k.. yet on this forum people seem happy with amp/dacs that only do 20~20k. Isn't this going to lead to the headphones sounding like any generic headphones @ 20~20k ?
 
Also looking to get a desktop usb/dac, I currently using sennheiser uusb1 with the fiio 5. 

 

[Grado77]

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[finchouse]

that's an interesting point. I've got an e17 on order, and didn't even think about this. I"m hoping some of the more veteran members can comment here. subbed

 

[Folex]

Since I have an E5 I'll use it as an example
 
● Frequency Response:
10Hz ~ 100KHz
● Suitable Headphone
Impedance:
16 Ω ~ 300 Ω
 
Full Size E10
 
● Frequency response
20Hz~20KHz
● Suitable Headphone
Impedance: 16Ω~300Ω
 
With this said is the E5 ($19) > ($70) E10, 

 

[PurpleAngel]

Quote:

I used to think the Denon's did not need an amp until I got the Fiio 5. I know its not the best amp or even close but with it I notice a difference with the Denons. They sound smoother and more satifying. 
This is the part I don't get, Denon's freq are 5~45k.. yet on this forum people seem happy with amp/dacs that only do 20~20k. Isn't this going to lead to the headphones sounding like any generic headphones @ 20~20k ?
Also looking to get a desktop USB/SAC, I currently using Sennheiser uusb1 with the Fiio 5. 

I believe the human ear can not hear sound above 15k.

 

[Folex]

". Specifically, humans have a maximum aural range that begins as low as 12 Hz under ideal laboratory conditions,[3] to 20,000 Hz in most children and some adults, but the range shrinks during life, usually beginning at around the age of 8 with the higher frequencies fading. Inaudible sound waves can be detected (felt) by humans through physical body vibration in the range of 4 to 16 Hz. "
 
 
I'd tried some of the lossless sound test and been able to hear up to 23k precisely and @ 24k I think I'm hearing it but I can't be sure. 

 

[Folex]

So no one has an idea about this ?

 

[PurpleAngel]

Quote:

Since I have an E5 I'll use it as an example
 
● Frequency Response:
10Hz ~ 100KHz
● Suitable Headphone
Impedance:
16 Ω ~ 300 Ω
 
Full Size E10
 
● Frequency response
20Hz~20KHz
● Suitable Headphone
Impedance: 16Ω~300Ω
 
With this said is the E5 ($19) > ($70) E10, 

The E10 puts out more milliwatts then the E5 for a given Ohm (something like twice the milliwatts?).

 

[PurpleAngel]

Quote:

I used to think the denon's did not need an amp until I got the Fiio 5. I know its not the best amp or even close but with it I notice a difference with the denons. They sound smoother and more satifying. 
This is the part I don't get, denon's freq are 5~45k.. yet on this forum people seem happy with amp/dacs that only do 20~20k. Isn't this going to lead to the headphones sounding like any generic headphones @ 20~20k ?
Also looking to get a desktop usb/dac, I currently using sennheiser uusb1 with the fiio 5. 

I believe the Denon AH-D2000 listing as 5~45k is more of a marketing tool then practical use.

 

[Folex]

Quote:

I believe the Denon AH-D2000 listing as 5~45k is more of a marketing tool then practical use.

 
I think the 45k part is overkill, as mentioned before the highest I've been able to hear is 24k (assuming the audio test was correct). But most people who buy Denon 2000's without modding aren't focused on the highs. On that same audio test I was able to to make out 5hz 9 out of 10 times. I closed my eyes while it cycled from 1hz up to 40hz. I would open my eyes when I was able to make out a sound or hear a rumble. This happened @ 5hz 9 times, and 6hz one of the times. And I'm not a frequency junkie, I'm just trying to justify why the denon's sound so good to me. 
 
 
Quote:

The E10 puts out more milliwatts then the E5 for a given Ohm (something like twice the milliwatts?).

This might work better with a higher ohm pair of headphones, but the denon 2000's have such a low impedance. I would think for the denon's the E5 would be better since it amp all the frequencies you'd hear/feel. 

 

[TMRaven]

Guarantee what you were hearing at 24khz and 5hz was just harmonics.

 

[Folex]

Quote:

Guarantee what you were hearing at 24khz and 5hz was just harmonics.

 
You may be right, I also tried the audio test with the 555's and I could not hear or feel anything until about 16hz-17hz and once again 23-24k. For me it just seems hard to believe that with a blind test I'm able to pick up the low's roughly at the manufacturer's spec.