Duvida na compra de Headphones

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Power Member
Boas!
Precisava da vossa ajuda na compra de uns headphones!
Entre estes dois modelos quais compravam?

Já agora podiam-me explicar o que quer dizer:
- Sound pressure level (SPL)
- Frequency response (headphones)
N entendo a diferença de valores de uns p/ os outros.. daí precisar da opinião e ajuda!
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Sennheiser PC 140
http://www.sennheiser.co.uk/uk/icm.nsf/root/05350#

Technical Data:
Jack plug 3.5mm stereo
Nominal impedance 32 Ohm
Ear coupling binaural
Cable length 3 m
Frequency response (headphones) 40.....20000 Hz
Sound pressure level (SPL) 109 dB(SPL)


Logitech Internet Chat Headset
http://www.logitech.com/index.cfm/products/details/PT/EN,crid=103,contentid=6339,detail=2

Technical Data:
* Frequency response:
o Headset: 20-20'000 Hz
o Microphone: 100-10'000 Hz
* Microphone sensitivity:-59 dBV/µbar, -39 dBV/Pa+/-4dB
* Headphone Impedance: 32 ohms
* Microphone Bias Voltage: 3.0 V DC
* Microphone Load Resistance: 2200 Ohms
* Connector: 2 standard 3.5mm audio jacks (audio in and out)
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Abraço
Rui Sousa
 
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