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

aufmerksam · « **Reply #230 on:** January 14, 2015, 01:54:44 AM »

My methodology to test for this potential issue was as follows:

SETUP
-PC(foobar) > gungnir > asgard2 > k7xxx

FIRST
-Dig out Random Access Memories, as test album for tha sexy bass
-Listen at normal (lowish) listening volume, all the way through, to see if anything sounded "off"
RESULT: sexy album, no flappy

NEXT
-Listen to the most sub-bass filled songs
-Stare at the Foobar sprectum visualizer to verify that the tracks were laying down sexy enough bass
RESULT: visual verification of album sexyness, still no flappy

LAST
-Repeat steps in "NEXT" while incrementally increasing volume until it was loud enough that I really couldn't give a shit if such a flappy might occur, since I will never listen that loud.
RESULT: my ears hurt, still no flappy

OBJECTIVE ANALYSIS
-Unable to produce flappyness while actually listening to music
-Unclear if this implies I have a non-defective unit, or I didn't try hard enough with "real science"
-Unclear whether this study implies need to recreate youtube video magic

SUBJECTIVE ANALYSIS
-Random Access Memories is really a great album, filled with lucious hooks and sexy sub-bass
-K7XXX is a great headphone for listening to this album, way more engaging than the HD600 is, but not as immersive as the HD800
-I am still glad I paid $200 for this headphone

superballz00 · « **Reply #231 on:** January 14, 2015, 02:13:08 AM »

Quote from: aufmerksam on January 14, 2015, 01:54:44 AM

My methodology to test for this potential issue was as follows:

SETUP
-PC(foobar) > gungnir > asgard2 > k7xxx

FIRST
-Dig out Random Access Memories, as test album for tha sexy bass
-Listen at normal (lowish) listening volume, all the way through, to see if anything sounded "off"
RESULT: sexy album, no flappy

NEXT
-Listen to the most sub-bass filled songs
-Stare at the Foobar sprectum visualizer to verify that the tracks were laying down sexy enough bass
RESULT: visual verification of album sexyness, still no flappy

LAST
-Repeat steps in "NEXT" while incrementally increasing volume until it was loud enough that I really couldn't give a shit if such a flappy might occur, since I will never listen that loud.
RESULT: my ears hurt, still no flappy

OBJECTIVE ANALYSIS
-Unable to produce flappyness while actually listening to music
-Unclear if this implies I have a non-defective unit, or I didn't try hard enough with "real science"
-Unclear whether this study implies need to recreate youtube video magic

SUBJECTIVE ANALYSIS
-Random Access Memories is really a great album, filled with lucious hooks and sexy sub-bass
-K7XXX is a great headphone for listening to this album, way more engaging than the HD600 is, but not as immersive as the HD800
-I am still glad I paid $200 for this headphone

Can you try some tones or sweeps below 40hz? Music usually doesn't go that low while movies do. The volume isn't that loud when the flapping occurs on my set since there is a steep roll off below 40hz on mine. Is the bass roll off due to the HP being open? My Fischer Audio DBA-02 is pretty flat even down to 20hz while the K7XX seems to drop off by 25db.

Marvey · « **Reply #232 on:** January 14, 2015, 04:50:59 AM »

Yes, open cans will drop off in bass severely or loses heft below a certain point. Only way around it is a bigger driver like with HD800 or Sony MA100. What you are describing on K7XX sounds 100% normal to me considering the small driver which may be tweaked differently from Q series. Cone excursion is huge at 30Hz. This is why most speakers can't do 30Hz properly. IEMs tend to be flat because they are totally sealed and coupled with your eardrum.

Again, I'd stop worrying about it unless it's a problem with music. Excessive worry about these things makes you ghey. I could easily do the same thing with my open baffle speakers and make a youtube video - the drivers with 1mm excursion. But I am not going to because I am not ghey. BTW, car engines blow up when you push them past their limits too.

donunus · « **Reply #233 on:** January 14, 2015, 09:15:32 AM »

Quote from: aufmerksam on January 14, 2015, 01:54:44 AM

RESULT: my ears hurt, still no flappy

My old Q701 playing random access memories using modi/vali at full volume... FLAPPY

robakri · « **Reply #234 on:** January 14, 2015, 10:04:57 PM »

Quote from: donunus on January 14, 2015, 09:15:32 AM

My old Q701 playing random access memories using modi/vali at full volume... FLAPPY

Well, they reach the max power input of 200mW at around 3.5V if I remember correctly (I recently calculated it). I'm not sure what the vali outputs, but it has a gain of 4 and the modi an output of 1.5Volts, I'm not sure if I'm correct to assume that that will be more than a 3.5V output, but I think so. If it is flappy, well you are probably causing cone breakup and ruining your headphones.

donunus · « **Reply #235 on:** January 14, 2015, 10:35:55 PM »

Actually the sound is more like it is underpowered in the way it clips causing distortion even in vocals of music. The flappy bass part actually improved quite a bit with burn in. Listening to the first track of the hunter by Jennifer warnes easily distorts my Q701 out of the Vali. Its either I need a LYR to power this thing or it is just not capable of playing loud music. Both drivers evenly distort making me think that it is a design flaw and not due to damaged drivers. Im talking 105 to 115db volume here with some music but with the Jennifer warnes cd it distorts below 100db I think maybe due to the type of bass content the recording has.

superballz00 · « **Reply #236 on:** January 16, 2015, 02:14:57 AM »

Quote from: donunus on January 14, 2015, 10:35:55 PM

Actually the sound is more like it is underpowered in the way it clips causing distortion even in vocals of music. The flappy bass part actually improved quite a bit with burn in. Listening to the first track of the hunter by Jennifer warnes easily distorts my Q701 out of the Vali. Its either I need a LYR to power this thing or it is just not capable of playing loud music. Both drivers evenly distort making me think that it is a design flaw and not due to damaged drivers. Im talking 105 to 115db volume here with some music but with the Jennifer warnes cd it distorts below 100db I think maybe due to the type of bass content the recording has.

Sounds about right with it distorting at around 105dB. The 20mW another user reported before the flapping sound kicked in would bring these 93dB/mW HP to around 105dB. Not sure how AKG can claim the drivers are rated for 200mW when they can't handle more than 20mW with low frequencies. At least they can fix the frequency response claim of down to 10hz with something more realistic. It probably will do 10hz but at -40dB. Was hopping these can handle at least 2V for some headroom but it doesn't seem to be able to handle much more than 1V.

DrForBin · « **Reply #237 on:** January 16, 2015, 06:04:13 AM »

hello,

for the December holiday i received these and a Schitt Asgard 2.

i have two iTunes libraries one loss-less and one mp3 ripped through the Apple program.

i was reading a subscribed thread on that other site and listening (mp3) to this:

http://www.allmusic.com/album/slow-circle-mw0000189733

specifically "Sleeping Lady."

when an odd thing happened.

i stopped reading, i closed my eyes, opened my ears, and tears came.

guess i'm just saying that for me these are very good cans.

donunus · « **Reply #238 on:** January 16, 2015, 10:45:07 AM »

Quote from: superballz00 on January 16, 2015, 02:14:57 AM

Not sure how AKG can claim the drivers are rated for 200mW when they can't handle more than 20mW with low frequencies.

Isn't it possible that the distortion is caused by the 20mW because it is underpowered? Like a boombox driving some maggies hehehe

Armaegis · « **Reply #239 on:** January 16, 2015, 11:05:55 PM »

I seriously doubt that the headphone would be designed to only operate between 20-200mW... that's only giving you ~10dB dynamic range in there.

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

aufmerksam

Re: AKG 7XXX (Massdrop) Measurement and Succinct Review

superballz00

Re: AKG 7XXX (Massdrop) Measurement and Succinct Review

Marvey

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donunus

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robakri

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donunus

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superballz00

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DrForBin

Re: AKG 7XXX (Massdrop) Measurement and Succinct Review

donunus

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Armaegis

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