Originally Posted by Andries
I want to buy an portable amp for my ipod touch and Vsonic GR07 BE.
I also need an DAC for my laptop to use at home, i will use it also with my GR07 BE, i however am planning on buying headphones in about 3/5 months and don't know what impendance they will have.
My first choice was the E17 for both at home and on the road.
Then the E12 came out and now i'm wondering if they + another DAC will sound better.
Another problem is that i don't know if earlier mentioned headphones will be just 150 ohm, or 600 ohm. So also power is an issue....
Most important will be the SQ at home, that means with the DAC. My budget is 250 USD, or will that not be enough?
So to conclude:
Amp and DAC or a combi. budget = 250 USD
amp used with: GR07BE on the road
amp and dac used with: GR07BE and headphones of unknown impendance.
most important will be the SQ at home.
I would really appreciate any help,
impedance isn't a problem, it's more of the SPL when it comes down to whether or not you're worried if something has enough juice to drive something. The ohms are resistance. Say if you have an hd800 (300ohms) and plug it into an ipod. You'll get a sound out of it (though not much), but your battery will be better than w/ something of a lower impedance (usually, but that depends also on the SPL/efficiency).
Think of it as a gardening hose. The end point is w/e u need to drive. Pretend 600ohm is your average hose to the headphone. Your headphone will need a certain amount of voltage/current to sound well. Think of a battery as water just being poured down a hose (not forced like when you have it connected to a water outlet). Now think of hooking that hose to a water outlet. Turn it on. A LOT more water will be able to get to the end point where that power is needed.
As for lower impedance, think bigger hose (less resistance), thus more water can be easily sent to the destination.
SPL measured in dB, is the efficiency. Anything above 100dB will be easily driven. IEM's from what I've seen are 108-120dB, so they're easy to drive.
That's how it is to my understanding. Most of the spl or ohm ratings are done at 1kHz for what I've seen, but your Vsonics are at 500Hz, so I'm not sure how to respond to the vsonic and amping.
Best thing would probably be an o2+odac (together) combo from JDS Labs. I don't think that the 2.5x gain should be a problem for your IEMs. As for power, the o2 should have enough power for w/e you're going to through at it, unless it's something like the HE-6.
Hope this helped!
Edit: Though it won't be OTG though since there's not battery. If you need OTG amp, o2 by itself will have the battery. If you need the dac by itself, it'll be $150. So ~$300 is what you're looking at if it's for portable... though not sure if iDecives use a USB out (somewhere on the forum a few weeks/months back someone confused me on this subject saying that only iPads had USB for keyboards).
Edited by MrViolin - 1/31/13 at 3:30pm