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Author Topic: AKG 7XX (Massdrop) Measurement and Succinct Review  (Read 53813 times)

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Marvey

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Re: AKG 7XXX (Massdrop) Measurement and Succinct Review
« Reply #140 on: December 08, 2014, 05:18:31 PM »
Quote from: donunus on December 08, 2014, 02:12:56 PM
What amp are you using with these Ultrabike? I have some Q701s here and they distort at a volume too low for my liking with the Vali. I was confused whether this was a maximum power issue for this series of cans with their 200mW max rating or if its just a case of just needing more power period.

Could be output Z of Vali at low frequencies?
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shipsupt

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Re: AKG 7XXX (Massdrop) Measurement and Succinct Review
« Reply #141 on: December 08, 2014, 05:46:17 PM »
I seemed to recall folks saying these AKG's needed a "good" amp. I always figured they benefited from something that could swing a little voltage.
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Yeah, well, you know, that's just, like, your opinion, man.

ultrabike

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Re: AKG 7XXX (Massdrop) Measurement and Succinct Review
« Reply #142 on: December 08, 2014, 05:50:59 PM »
It's not an efficient can for sure.
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Marvey

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Re: AKG 7XXX (Massdrop) Measurement and Succinct Review
« Reply #143 on: December 08, 2014, 06:17:12 PM »
I had no issues with the K7XX with the Vali though; but I didn't crank it.

Glad you took the measurements. It seems the dip is not as much with more open baffle measurement - as I suspected.
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ultrabike

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Re: AKG 7XXX (Massdrop) Measurement and Succinct Review
« Reply #144 on: December 08, 2014, 07:04:50 PM »
It's all relative. I still had about 10 dB of margin on my 2i2 so possible to blast 100 dB SPL from the 7XXs. Vali can put out more voltage than the 2i2 so best guess is that it can power these with ease.
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Armaegis

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Re: AKG 7XXX (Massdrop) Measurement and Succinct Review
« Reply #145 on: December 08, 2014, 07:52:50 PM »
Quote from: anetode on December 05, 2014, 09:53:37 PM
Whatever you have lying around. Rumors of the K7 series being hard to drive are greatly exaggerated.
Quote from: Claritas on December 06, 2014, 12:43:37 AM
It was how people avoided coming to terms with their dislike for the sound.
Quote from: marvey on December 05, 2014, 10:24:30 PM
LOL, HD600/H650 were "hard to drive" back in the day. I blame HFM.

I always figured it was people going from the Senns to the K7__ (probably off a receiver or other amp with high output Z, which would exaggerate the midbass hump on the Senn) and then trying to come to terms with the sudden loss of bass. So of course "burn in" or needing a new amp becomes the default explanation. Of course, after 100's (or 1000's!) of hours those pads will soften too, which usually skews the sound to the slightly warmer side.
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Do you think there may be an acoustic leak from the jack hole? ~Tyll Hertsens

Not sure if I like stuffing one hole or both holes. Tending toward one hole since both holes seems kinda ghey ~Purrin

spoony

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Re: AKG 7XXX (Massdrop) Measurement and Succinct Review
« Reply #146 on: December 09, 2014, 12:57:52 AM »
Cool! Why are the distortion figures so different from Marv's?
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Marvey

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Re: AKG 7XXX (Massdrop) Measurement and Succinct Review
« Reply #147 on: December 09, 2014, 01:41:07 AM »
I'm pushing mine probably 10db or more louder.
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ultrabike

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Re: AKG 7XXX (Massdrop) Measurement and Succinct Review
« Reply #148 on: December 09, 2014, 02:42:35 AM »
Possible. Different calibration, different setup. Notice however that both in Marv's and my distortion measurements there are distortion peaks around 2 kHz for the right driver, and around 1 kHz for the left. Different baffles might also create different distortion results (specially absolute) perhaps due to different frequency response.

Perhaps if the tools allowed for % THD plots things might be closer.
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donunus

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Re: AKG 7XXX (Massdrop) Measurement and Succinct Review
« Reply #149 on: December 09, 2014, 03:48:50 AM »
Anyway I will try with more amps and see if they distort at around the same loudness. If so, then I guess its more about the cans nbot being able to tolerate my abuse of volume vs needing more power hehehe
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