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Originally Posted by fhuang /img/forum/go_quote.gif
hi Ray,
i know(you said) this is a very powerful amp but frankly i'm more concern about this amp pairing with iem and portable/low impedance headphone. i mean after all this is still a portable amp(no dis). if i'm getting one, i'm going to use it with iems or low impedance headphone a lot more than high impedance headphone.
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It is designed with UE10, ES2 & Shure E500. The lower gain of 1 does great with those cans.
As to the battery, you should not worry, as the battery will stop charging when it is full. whether being pluged to the charger all the time or not.
Yes, you can charge the battery & play music at the same time.
I found out that many recorded CDs are recorded very low and some times much higher signal is encoded on them. Also the difference in source's outputs are a great factor when designing an amp with gain switch. Having these two factors in mind you do not want to listen to your low recorded music, on a low output source, using very high impedance headphones, with your pot being at at 5:00 O'Clock, DO YOU?. These three factors when they get together you wish that some higher gain was avaialable on your amp to put your Pot around 12:00 or 1:00 O'clock. Thats why we implemented the high gain on the Predator, it is not to lie to the buyer or try to cheat others of of their hard earned dollars. Now gain of 4 will always be perfect with most recording if they are recorded at proper level & if it happen you use your Predator with some home base sources that have higher signal output.
We put a gain of 1 for IEMs for one reason and one reason only, to give a better control over the volume pot so when you dial the knob you will be far away from the biginning of the start of the pot so your two channel's sound stage will be locked in the middle rather than the music being shifted toward one side.
When I designed the SR-71, It had fixed gain at 6, it was fine most of the time with most players of that time as most of them used to have a higher output voltage swing, but still those who used to listen very loud & happened that the music that they had was recorded at lower level, expressed to have the gain of the SR-71 set to that of 11, which I did.
So it is not whether the amp needs this high gain or not it is the conveience
that gives you as an owner to have a better control over your music & sets your pot at the better location when dialed to your level of listening.
Ray Samuels