Just wondering if anyone knows whether Lithium-Ion batteries like the one used in the upgrade option in the old Practical Devices XM4 can be replaced easily. Mine doesn't seem to hold it's charge for very long at all now (even without using it it will discharge very quickly). All i can find is...

I’ve been reading through a lot of posts here and have learned a lot. I’m hoping y’all don’t mind if I ask a few newbie questions to see if I’m on the right track.   I’m using mostly my iPhone 4s (but sometimes my iMac) to listen to AAC files recorded at 128 bit rate, but also have a few...

Hello   I'm looking for a headphone amp that would make the following set-up sound as good as it can:   Iphone 3GS -> Mp3 192-256-320kbps  -> ?Portable Amp/DAC? -> Audio Technica ATH M50?   Only a few files are mp3 192kbps ones. Most of em are 320kbps mp3 files.   Thanks for any...

Hi.   I'm looking for the best portable amps under $250 that i could use to power the ATH-M50 headphones using the headphone-out of my Cowon J3.   In the meantime, I'll look for posts about amping the M50.   Thanks in advance.

In my attempt to choose a portable amp, I am trying to find differences in features. The 2move has crossfeed, which is touted as highly improving the soundstage (you can tell where the instruments are as if you were using speakers instead of headphones.) Does the Predator use this, or does hot...

i just need to know the best headphone amplifier for Ultrasone HFI-580   criteria : it has to have quite punchy bass boost for these phones also it must boost the volume of these phones i need it to be a DAC also for the pc its price range is max 120 $

I'm transferring this over to the main Headphones forum. This started off as a search for Canadian manufacturers, but it has expanded since then. I'm mostly focusing on Canadian manufacturers/distributors/retailers of headphone gear and trying not to branch off into regular home theatre...

Hello. I've been doing some research on amps for some time and selected some models. I wish you guys could help me choose from one of them, or give me a better choice, within the U$100(or lower)-U$130 price range. So, the ones I picked up so far are:   Bravo Tube Headphone Amplifier V3 EQ...

I will buy MD series Denon 2000 from LawtonAudio soon and I am looking for an amp. I like small amps that can be brought along without to much trouble for smartphone use. Will be used quiet a bit with computer too, but I am just not sure I need the DAC USB feature?   I have read about RSA...

Wich one will deliver me the highest volume and bass boost without any distortion and muddy bass?   now i using RE0 but in the future i'll buy Monster turbines or Hippo VB

NOTE: This is a SUBJECTIVE Review that has occurred over a long time horizon. All observations, rankings, and comments are my personal opinion and nothing more. For testing Methodology please see post#8. Some pics of the initial batch of amps reviewed: #1: from top to bottom, the RSA...