Headphone speakers frequency response

[IZBEIDZ10]

Hi!
Is there any chance that frequency response can be at least 12.5 kHz for Logitech H650e if we include mistake or other field/distortions?

• Frequency response: 50Hz-10KHz (Diffuse field)
• Sensitivity: 90 dB ±3 dB at 1 KHz, Input 0.56V/10 mm free field
• Distortion: <4% @ 1 kHz, 0 dBm0, 1 kHz
• Compliant to EN60950-1

https://www.logitech.com/en-us/prod...siness-noise-cancelling.981-000518.html#specs

 

[NickK]

Almost impossible to say without someone analysing it.

a frequency range isn’t a brick wall so it will taper off. Typically they’ll give the -3dB points.

Any specific reason you ask about 12.6KHz?

Also their sensitivity statement is pure bole. 90dB +/-3dB yada.. it sounds like they’re trying not to say 87dB (the assumption here it’s 447mV which is consumer line-in 0dB).

have you looked at plantronics if you need a Headset?

 

[IZBEIDZ10]

I'm just wondering how it works from view of physics. They show specific data frequency response: 50Hz-10KHz. As you said - frequency range isn’t a brick wall.
If we use sensitivity mistake +/-3 db, can it possibly indicate that frequency response can be higher (more than 10KHz)? Also there is mentioned that 50Hz-10KHz is measured using diffuse field acoustic testing. Do other method can show different frequency response data?

 

[NickK]

The typical thing is to give a range where the frequency rolls off -3dB.

Another complicating thing is the impedance and the driving amp. Speaker impedance isn’t one value - my 55ohm HPs increase to 800ohm at higher frequency. So depending on the amp output impedance the final output frequency response will differ.

In short it’s likely there is higher frequency however for long term listening, quite often they roll off the higher frequency (say starting at 7khz) to prevent fatigue.

The only real way is to have a frequency response curve for the amp+HP pairing but most drivers have a frequency response curve published (for any good HP or speaker drivers).

 

[IZBEIDZ10]

Seems similar example here:
https://slideplayer.com/slide/17134700/99/images/7/Example:+Loudspeaker+response..jpg
It says 3db difference can produce 2 times in intensity. Do you know how it effects max frequency?

 

[NickK]

+3dB is seen as 2x signal power and it’s also roughly used in the past as “twice as loud” but what a human hears twice as loud is complex so people perceive up to +10dB as “twice as loud”.

Speakers are complex - the frequency response graph is a single tone. However heavy transients can alter that due to the momentum of the speaker cone, effect of supports or dampening has, the voice coil and magnet/electromagnet.

In short -3dB roll off points give a good finger in the air. So it’s likely that higher frequencies are supported but are rolled off. How much and how quick depends on the speaker (and amp). That isn’t provided by Logitech.