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On board audio

FOG
By FOG
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Onboard Chips:

Realtek ALC885/889/892: 2 Ohms

Realtek ALC1150 w/ TI TPA6120A2 headphone amp: 10 Ohms (as seen on Asus ROG Formula boards, known as SupremeFX.  Note that some ROG boards only feature the ALC1150 chip and not the TI TPA6120A2 Op-Amp.  Confused yet?)

Realtek ALC1150 w/ TI NE5532 headphone amp: 0.3 Ohms (as reported in the Op-Amp spec sheet, still unconfirmed.  ASRock's "Purity Sound" featured on the Z87 Extreme4 and up)

 

 

Copied from the FAQ found here: http://linustechtips.com/main/topic/18617-the-audio-boards-frequently-asked-questions-pre-answered/

 

Looks like anywhere from .3 to 10 ohms for the few ones listed. 

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What is the average impedance of on board audio, or does it depend.

 

Low enough that it should be fine with pretty much every headphone. Unless you find some weird ass headphone with 5 ohms or something lol 

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Motherboards that advertise a "600 ohm headphone amp" generally have a 10 ohm output impedance. Realtek/VIA chips are generally under 4 ohms. I think the one exception so far has been from ASRock, but I forget the branding they've stuck on it.

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Motherboards that advertise a "600 ohm headphone amp" generally have a 10 ohm output impedance. Realtek/VIA chips are generally under 4 ohms. I think the one exception so far has been from ASRock, but I forget the branding they've stuck on it.

That would be the Purity Sound. and they're doing it the proper way, with that 0.3 ohm output impedance. ASRock is growing on me... 

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That would be the Purity Sound. and they're doing it the proper way, with that 0.3 ohm output impedance. ASRock is growing on me... 

 

I was talking to a mate the other night about the Asrocks, he just built a pc for someone using one as I have and we have both come o the conclusion that Asrock are definitely becoming the next best thing in Motherboards if they aren't already.

Grammar and spelling is not indicative of intelligence/knowledge.  Not having the same opinion does not always mean lack of understanding.  

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I was talking to a mate the other night about the Asrocks, he just built a pc for someone using one as I have and we have both come o the conclusion that Asrock are definitely becoming the next best thing in Motherboards if they aren't already.

They're definitely putting money into R&D instead of marketing like the other brands.

PC Build in LTT Gallery - JBL J88 - Fostex T50RP (Modded) - Pioneer SE-A1000 vs audio-technica ATH-AD500X - Skullcandy Aviator  
audio-technica ATH-T400 - CHC Silverado and Laredo - Clip-On Headphone Roundup - Sony LinkBuds

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And as in the Tom's hardware article, keep in mind I'm just going off the chip spec. Op-amps can have large resistors in front of them, so things may vary brand to brand and board to board. Honestly I should change that in the FAQ to make it more clear.

Implementation is everything.

"Pardon my French but this is just about the most ignorant blanket statement I've ever read. And though this is the internet, I'm not even exaggerating."

 

 

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1 question, is the lower the impedence better or higher?

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1 question, is the lower the impedence better or higher?

 

Generally lower is "better" due to the damping factor. Ideally you want your output impedance to be at least 8x lower than the impedance of your headphones. This means for 32 ohm headphones you would want an output impedance 4 ohms or less. 

 

More info about how output impedance & headphone impedance relate to the damping factor: http://en.wikipedia.org/wiki/Headphone_amplifier#Output_Impedance

CPU - 3770k @ 4.7GHz | Motherboard - Asrock Z77 Extreme4 | RAM - Crucial Ballistix Sport 16GB @ 1600 | GPU - EVGA GTX 770 SC ACX (2x SLI) | Case - Coolermaster HAF XM | Cooling - CM EVO 212 | Storage - Corsair Force 3 90GB | WD 2TB x 2 | PSU - Thermaltake SMART 850W | Display - Asus VG248QE 144hz + GSYNC kit |  Mouse - R.A.T. 7 | Sound - Creative Titanium X-FI HD | DT990 | ATH-M50 | ATH-AD700

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Generally lower is "better" due to the damping factor. Ideally you want your output impedance to be at least 8x lower than the impedance of your headphones. This means for 32 ohm headphones you would want an output impedance 4 ohms or less. 

 

More info about how output impedance & headphone impedance relate to the damping factor: http://en.wikipedia.org/wiki/Headphone_amplifier#Output_Impedance

:o Ok thanks.

ASUS ROG G75VX

 

Intel i7-3630QM 2.4GHz/3.4GHz Turbo | Nvidia GeForce 670MX 3GB OCed to 736MHz | 750GB HDD | Windows 8.1 | 24 GB 1600MHz RAM | Razer Goliathus Medium | Logitech G400s | Razer Kraken/ JBL J22 | Corsair Vengeance K70 Cherry MX blue

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