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TOPPING DX9！
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That's it.
oleg87
Addicted to Fun and Learning
Fuse talk on ASR? No words. 
Its getting silly now. I guess though this is how magazines like Stereophool stay in businessYes well I learn a lot here, but I also wanted to contribute, you see, what ASR really seemed to lack was
a talk about purple or orange fuses!I'mma hold off buying those. I'm sorry, man.
Bl00dWolf
Member
I asked Topping for clarification regarding the same situation as with the DX5 II, but for the DX9.
I asked if it was possible to connect headphones to different outputs at the same time, and whether this would cause any damage.
So I'm using DX9 with IEM ZERO2 or Nova via 6.35 and NOIRE X via 4.4 simultaneously.
I asked if it was possible to connect headphones to different outputs at the same time, and whether this would cause any damage.
So I'm using DX9 with IEM ZERO2 or Nova via 6.35 and NOIRE X via 4.4 simultaneously.
Roland68
Master Contributor
The DX9 has completely separate amplifiers for balanced (4.4 ohms and 4-pin XLR) and single-ended (6.3 ohms) headphones.
Therefore, it doesn't matter if you connect a single-ended and a balanced headphone to the DX9; it's essentially the same as having two separate headphone amplifiers.
If you connect two balanced headphones to the DX9 simultaneously, you're connecting the impedances of both headphones in parallel.
As long as you don't go below the DX9's minimum impedance, this isn't a big problem. For example, 32 ohms + 32 ohms = 16 ohms is okay, but 12 ohms + 12 ohms = 6 ohms is not.
However, with significantly different impedances, such as 32 ohms + 300 ohms = 28.92 ohms, the amplifier in the DX9 only sees the resistance of 28.92 ohms.
Do you notice anything? So, if both headphones are plugged in, you risk overloading or damaging one of them.
Even worse with very different headphones with the same impedance, e.g. an HE6se (V2) and a very sensitive IEM. The DX9 has a resistance of approximately 32 ohms, which is a really high power output.
Anyone who listens very loudly with the HE6se (V2) shouldn't be surprised if the IEM is dead afterwards, because it has just been roasted in the electric chair.
More importantly, all types of headphones are subject to aging of the materials used in the drivers and diaphragms, and also to wear and tear.
You do realize that you're significantly reducing the lifespan of your headphones if they're always plugged in, right?
Personally, I think it's a bad idea to leave two or more headphones plugged in when they're not in use. If multiple headphones are used simultaneously, none of them can be overloaded; that would be noticeable.
Bl00dWolf
Member
That's exactly what I was worried about.
I always have two connected now:
IEM to unbalanced 6.35 and NOIRE X to balanced.
In the DX9 menu, I always select one type, and the others turn off automatically:
1) IEM ON, 4.4MM OFF, 4-PIN XLR OFF
2) IEM OFF, 4.4MM ON, 4-PIN XLR OFF
3) Headphones OFF, XLR to monitors ON
I don't really want to constantly disconnect and reconnect my headphones.
As I understand it, DX9 does not supply power to them when I'm not using them, because with the XLR output to the speakers, all my headphones are in off mode.
The same thing happens when I use IEM - no sound with 4.4 Noire X. And vice versa - when I use Noire X, the is no sound with IEM 6.35.
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Roland68
Master Contributor
As long as you take the trouble to deactivate the respective outputs in the menu, it's not a problem, since the outputs are physically separated via relays.
Hello,
Just bought the thing few days ago and pretty disappointed with how loud it is, hoping there are some owners here that can confirm (or not) what I am hearing/measuring.
I noticed that it was not very loud compared to my E30 II Lite/L30 II stack but dismissed it audio memory can be fickle. After buying the HE6 and couldn't get enough volume from it on mostly quiet masters, I tested its headphone BAL out against the E30/L30. To my surprise, all things being equal (max volume/max gain/same songs), the difference between them was quite huge, DX9 is noticeably quieter. Roughly measuring with a phone db meter using multiple headphones HE6, HE1000, LCD-X, the difference was always 9-10 db in favor of L30 II. And that's compared to BAL, SE was 6dbs less (as it should compared to BAL, which kinda means my difference measurements were pretty OK), so about 16 dbs less than L30 II. For roughly same power, 16 dbs is absolutely huge.
Also bought an L70 and, connected to DX9 pre amp, abolutely blows DX9 balanced out of the water, at least 20 dbs louder.
Any owners here that also compared with a similar stack or amp? Not sure if my unit is defective or there's a reasonable explanation for the above. And yes, I know there are different gain structures but still.
Thanks!
Just bought the thing few days ago and pretty disappointed with how loud it is, hoping there are some owners here that can confirm (or not) what I am hearing/measuring.
I noticed that it was not very loud compared to my E30 II Lite/L30 II stack but dismissed it audio memory can be fickle. After buying the HE6 and couldn't get enough volume from it on mostly quiet masters, I tested its headphone BAL out against the E30/L30. To my surprise, all things being equal (max volume/max gain/same songs), the difference between them was quite huge, DX9 is noticeably quieter. Roughly measuring with a phone db meter using multiple headphones HE6, HE1000, LCD-X, the difference was always 9-10 db in favor of L30 II. And that's compared to BAL, SE was 6dbs less (as it should compared to BAL, which kinda means my difference measurements were pretty OK), so about 16 dbs less than L30 II. For roughly same power, 16 dbs is absolutely huge.
Also bought an L70 and, connected to DX9 pre amp, abolutely blows DX9 balanced out of the water, at least 20 dbs louder.
Any owners here that also compared with a similar stack or amp? Not sure if my unit is defective or there's a reasonable explanation for the above. And yes, I know there are different gain structures but still.
Thanks!
Roland68
Master Contributor
Do you own a DX9 or DX9 Discrete?
DX9. The one with AKM chip. Amplified should he the same though?
Its measurements are consistent, I get:
6 db difference between SE and BAL
5 db between Low and High gain on SE
11 db between Low and High gain on BAL
Just the difference between it and L30 II is huge
Roland68
Master Contributor
First, I’d like to verify that the headphone cabling is sound and free of faults, as that could be the cause of precisely these kinds of issues.
Do you have both SE and balanced cables for each of your headphones?
Do you use adapters for them?
Unfortunately, there are "pseudo-balanced" cables and adapters on the market where the negative contacts for the left and right channels are shorted together.
You can easily check this using a multimeter.
Here is some basic information regarding comparability:
For starters, the gain (input to output) differs for each of your devices.
Each potentiometer or volume control used may have a different logarithmic curve. This means the physical position of the knob tells you nothing; only the maximum setting is comparable. Alternatively, you would need to measure the actual gain from input to output.
Input sensitivity may also vary.
Cables are fine, either Hifiman or decent quality from Amazon. Same results with all and some are 4.4 some XLR. No adapters. I Have both SE and BAL for some headphones, yes.
Yep, I know gain matters a lot but still didn't expect such huge difference. Actually i was expecting to be louder than L30, not way quieter. By itself it's not usable with HE6se, assuming negative pre amp for EQ and some quiet masters.
Tested Fiio K17 today and, on Ultra high gain is also around 12 dbs over DX9. Both max volume.
Anyone has experience with both?
Yep, I know gain matters a lot but still didn't expect such huge difference. Actually i was expecting to be louder than L30, not way quieter. By itself it's not usable with HE6se, assuming negative pre amp for EQ and some quiet masters.
Tested Fiio K17 today and, on Ultra high gain is also around 12 dbs over DX9. Both max volume.
Anyone has experience with both?
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