If the company had supplied me with the unit, I would have done exactly that. But when members send something to be tested, I do that and post the results. You need to be pushing companies to publish comprehensive measurements like I do so there is no doubt as to validity of the testing. Until they do, this situation will remain.I wish Amir had arranged to have the amp inspected at the factory before publishing such a scathing review.
And I thoroughly enjoyed rock music in the late 1970's played through my pair of big custom JBL bass reflex speakers (from Hank Hong of Honker's Sound Company in Berkeley, CA). The drivers were the famous JBL S8 drivers with 15" woofer, and powered by a McIntosh receiver. This speakers below are JBL C50's - with the same S8 drivers and crossovers.NO. I'm saying I find rock n roll very pleasing and exiting with this setup. Very simple.
The DCA Stealth is a power hungry headphone. It sounds beautiful out of the HPA-1. It's plenty loud with the volume level at noon. With some songs I get so into it, I turn it to 2 or 3pm, but very rarely because that's hearing damage territory.If someone thinks that $3.7k is a fair price for a headphone amplifier sans DAC without balanced input and output, and not enough juice for "power hungry" headphones, go for it. As for me, I'll stick with My $350 Topping DX7s DAC/headphone amp which doesn't have those limitations, and spend the $3.3k I saved elsewhere.
The claim is that sighted listening tests are worthless.
2 volts is the maximum DAC RCA output of almost all the DACs I test. It is not material what the product does beyond that level of input. You are not likely to have that kind of source. Heck, a lot of mass consumer products don't even do 2 volts out (think many AVRs).With a gain of 8dB (x2.5), you cannot actually "push the product to its limit" with the 2VRMS output of your analyzer.
Nope. To grok this amplifier you have to be ready for it to go into clipping with insensitive headphones. And have noise with every sensitive IEMs/headphones.To grok this amplifier, you need to prepare yourself psychologically for the concept of 0.1% distortion.
They are only worthless if they go against all objective data and engineering knowledge. In this case, the amplifier is extremely weak by desktop standards and readily will go into clipping region. You don't need a blind test to know that the sound is severely distorting then. Measurements back the same.The claim is that sighted listening tests are worthless. So I choose to ignore your subjective evaluation. I do wonder if your impressions of the amplifier's sound were colored by knowledge of the measurements.
You were allowed to say what you wanted despite creating a duplicate login after being banned before. So don't use that card. Like your arguments about this product, you speak without correct knowledge.You're just wrong Amir. It's not a good review. But the thing is, nothing good ever comes from arguing with a narcissist holding a ban hammer.
LOL, I've said what I came to say. See ya.
You have to use critical content and listen for the distortion. Otherwise it may be very difficult to hear it. In addition, some clips sound a lot less loud than others due to their spectrum but nevertheless stress the amp (low frequencies do this). Here are my goto test tracks:The DCA Stealth is a power hungry headphone. It sounds beautiful out of the HPA-1. It's plenty loud with the volume level at noon. With some songs I get so into it, I turn it to 2 or 3pm, but very rarely because that's hearing damage territory.
More than enough power for this application, it would seem. But there's a graph on the internet says it doesn't have enough power, so what do I know.
Nope. To grok this amplifier you have to be ready for it to go into clipping with insensitive headphones. And have noise with every sensitive IEMs/headphones.
The ear is remarkably insensitive to 2nd harmonic distortion in real-world signals. Nelson Pass has written plenty about this. You just don't need ultra-low distortion for audible transparency.
I wish Amir had arranged to have the amp inspected at the factory before publishing such a scathing review.
Alright, I bought the "Silent Shout" album on Bandcamp and downloaded it as FLAC (16 bit, 44.1 kHz). "Like a Pen" is a fun track!You have to use critical content and listen for the distortion. Otherwise it may be very difficult to hear it. In addition, some clips sound a lot less loud than others due to their spectrum but nevertheless stress the amp (low frequencies do this). Here are my goto test tracks:
Let them play out until you get a mix of bass notes and the highs. Then listen to how clean the highs are are you turn up the volume. Tolerate it for a few seconds if it is too loud. The idea is to get used to hearing the distortion and what it sounds like. Then you can turn the volume back down and see where the distortion disappears.
And oh, please stream the original versions. Youtube clips likely have lossy compression artifacts of their own so may not be revealing.
Well, each to their own I guess. If your notional human that likes to crank it up to 120dB does so on a regular basis their hearing won’t last long.You are confusing constant average A-weighted SPL (as shown in the linked safety regulations) with unweighted peak SPL in the bass and the desire to have distortion free audio reproduction where distortion is not allowed. This has been discussed a number of times. Most people will not listen to more than a few mW on average. It is not about those people. It is about having the ability to drive a headphone to 120dB SPL peaks when someone cranks a song up to uncomfortable loud levels and wants to do that without running into distortion. I am not advertising to listen to those average levels all day long. How much voltage/power is needed (if one has a couple of headphones) depends on the efficiency and impedance of them. Some may never need more than 50mW, others may want several Watts.
Besides, this isn't about the HD650 it is about the input voltage needed to reach clipping levels. The HD650 is actually quite efficient but there are other headphones that aren't.
Like the well known DT880/DT990 600ohm for instance.
Here is a much needed video on the topic of how loud we really listen to music. And issues related to hearing damage, etc. It is an argument that seems to come up twice a day since I started testing headphones. Here, I review the literature on true dynamic range of music and considerations...www.audiosciencereview.com
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Well, each to their own I guess. If your notional human that likes to crank it up to 120dB does so on a regular basis their hearing won’t last long.
My 2 cents, ymmv etc etc