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A Review On: JDS Labs Assembled Objective2 Headphone Amplifier

JDS Labs Assembled Objective2 Headphone Amplifier

Rated # 2 in Desktop Amps
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Review Details:
Audio Quality
Design
Quality
Value
DSW92
Posted · Updated · 23418 Views · 5 Comments

Pros: Very noticeable improvement in sound quality

Cons: Everything is on front panel

I bought this amp for my Q701s (Which I won't receive until Friday). When it came I took it out just to make sure it works (All my current headphones are low impedance and don't require an amp). I hooked it up with probably one of the worst possible sources you can imagine: a Nintendo DS (I was in the middle of playing a DS game when it arrived). Of course there was volume, but I also almost immediately noticed that the soundstage got bigger and the instrument separation became better. This was on my AD700s. I thought to myself it must be me imagining things. Just to make sure I switched back to directly plugging into the DS and the DS->Objective2->Ad700 setup. There really was an improvement, not just volume, I adjusted the knob so that the volumes were the same. The improvement is definitely real and doesn't require careful listening to notice, it was almost immediately noticeable. Needless to say, I am impressed as I have always been skeptical of headphone amps, but this one made me believe all the hype.

5 Comments:

"I hooked it up with probably one of the worst possible sources you can imagine: a Nintendo DS"
I feel your pain, but with a 3DS, hahaha. It really does have a lame audio system. The O2 helps it quite a bit.
Thanks for that review. i was on the fence as i don't have Golden ears and can't tell minute differences. But I may have to pull the trigger now. ;)
It will also depend on your headphones whether or not you will hear a difference. On my Sennheiser Amperiors, the difference wasn't as noticeable.
I have Grado SR80's myself, also V-Moda M80's. Easily drivable with low impedance. Would they offer more potential for improvement with such an amp?
I can't really say because I haven't tested the O2 with those headphones (though I do have an M80 myself so I might do that later).
It depends on a lot of factors, such your original source also and the output impedance of that. Generally the 1/8 rule applies in which the output impedance should be at most 1/8 of the headphone impedance, otherwise the frequency response can get screwed up a bit. In this case you would hear a very noticeable improvement with the O2, since the O2 has near zero output impedance. On power hungry headphones improvement would also be very noticeable, since if the headphones are under-powered, it wouldn't sound right as well. I've heard out of an ipod, Q701 is more of a sidestep compared to AD700, however it's generally accepted and common knowledge that the Q701 is a big upgrade compared to the AD700. On my AD700 (32ohms same as SR80), sound was definitely cleaner. I think since my Amperiors have a much smaller soundstage, the difference was not as noticeable. There's a lot of factors, but I think you will definitely hear an improvement. The M80 and SR80 both have a bigger soundstage than the Amperiors. I can't guarantee substantial improvement, but I think it's better to just buy the amp. You should at least hear a small improvement and in case you want to upgrade to better headphones later, this amp will make a huge difference compared to an unamped source. I'm trying to be as helpful as I can since many things said here are subjective and you don't really know until you judge with your own ears.