GAD
Headphoneus Supremus
- Joined
- Mar 26, 2007
- Posts
- 1,715
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- 11
OK first let me preface this with the statement that I am not the audiophile that many of you are, and my impressions are based on, shall we say, more of a layman's point of view.
My experience with headphone amps is limited to the Headroom Micro with the desktop module. I use this amp with the Micro DAC at home (FLAC, MP3) and alone with my iPod (Cryo Dock) at work. My main cans are the Sennheiser HD-650 for home listening, and the Etymotic ER4p IEMs for work.
I listen to all sorts of music, but for testing I used Norah Jones "Come Away With Me". I also used a variety of rock music such as Nickelback and Green Day since that's what I often listen to at work. I know what I like, but I'm not always good at describing it.
I wanted to get a dedicated work/travel/mowing/whatever rig so I could leave the Micro amp at home. To this end I purchased a set of Sennheiser HD-580 headphones and a Practical Devices XM4 amp (I'd use the Etys mowing and traveling). I am very happy with the HD-580s as you can read in my thread in the headphone forum.
I like quality gear. I'm willing to pay more for the good stuff because I'm rarely disappointed when I do. I'm also pretty good at figuring out when "more money" does not equal "better".
The XM4 is an adorable little amp. I swear that was the first thing I thought when I opened the box. The packaging is minimalistic, but I paid for an amp, not a pretty box, so I'm fine with that. I'll spare you the details about it's look and finish, other than to say it's a good looking little amp.
When I first plugged in the IC cable, I noticed something odd. The cable was not sitting perpendicular to the faceplate. Indeed, I could move the cable freely back and forth and up and down. With some pressure I could impact the signal. Ick.
Out of the box the little amp drives the HD-580s, but the volume is at about two o'clock with normal listening volumes. No problem, open the amp and you can pop on some jumpers to boost the gain. Simple enough, but a switch would be better. In fact I'm surprised there's no switch for gain. This thing has variable defeatable crossfeed, defeatable bass-boost, auto power-off (4 settings!), an LED dimming feature (nice!) and a friggin' flashlight mode. A gain switch would have been nice. Anyway with the gain up, the volume is now at about 9:30 and I'm rockin'. The problem is that with the gain increased, there is an audible hum when using my Er4ps.
Actually - the hum got me thinking - it sounded like a good old fashioned 60Hz hum, and sure enough it was - the hum exists when the amp is plugged in. Since you can charge and play at the same time (assuming rechargable battery of course), I would do that - a lot. While on battery only, there is a slight hiss, but nothing I could hear with music playing.
The bass-boost is a nice feature, because to my ears the amp sounds a tad anemic. The problem is that with the base-boost enabled, I think it sounds too boomy. I am not a bass-freak and boomy bass is a sure way to turn me off. Between the two, I like the base-boost on.
The Cross-feed feature seems to be one of those love/hate things. On my Micro amp I love it - no - I *adore* it. It's subtle, but when you turn it off you miss it. Beautiful! On the XM4 the crossfeed is adjustable which is a nice touch. The problem is no matter how I adjust the crossfeed, I hate it. First the volume is cut significantly with crossfeed enabled. Second, it seems to sound even more anemic. Bass-boost to the rescue right? Not so fast. It's almost as if the cross-feed lowers all sensitivity, but the bass-boost only boosts the bass. Now it's even more boomy.
The volume seems to be uneven somehow on my copy. On low volume, when I slowly increase the volume, it increases first in the left, then the right. Also with the gain up and the ER4ps in place (low gain phones to be fair), I cannot turn the volume to "off". There is always sound. Once at normal listening volume this is not an issue, but now I wonder if the left side is louder than the right...
Now with all the negatives, I can almost certainly say, that if I did not have the Micro amp to compare it to, I would love it to death. The Micro has ruined me though.
For the price ($165 shipped with rechargable battery and adapter), it's a nice little amp. I'd be happier if it had better jacks, but otherwise the build quality is pretty solid. It can't compare with my Micro amp, but it's not designed to.
For my money, I'd spend the extra money and get a Hornet or one of the other premium amps. If that's not an option, the XM4 might be just the ticket.
GAD
My experience with headphone amps is limited to the Headroom Micro with the desktop module. I use this amp with the Micro DAC at home (FLAC, MP3) and alone with my iPod (Cryo Dock) at work. My main cans are the Sennheiser HD-650 for home listening, and the Etymotic ER4p IEMs for work.
I listen to all sorts of music, but for testing I used Norah Jones "Come Away With Me". I also used a variety of rock music such as Nickelback and Green Day since that's what I often listen to at work. I know what I like, but I'm not always good at describing it.
I wanted to get a dedicated work/travel/mowing/whatever rig so I could leave the Micro amp at home. To this end I purchased a set of Sennheiser HD-580 headphones and a Practical Devices XM4 amp (I'd use the Etys mowing and traveling). I am very happy with the HD-580s as you can read in my thread in the headphone forum.
I like quality gear. I'm willing to pay more for the good stuff because I'm rarely disappointed when I do. I'm also pretty good at figuring out when "more money" does not equal "better".
The XM4 is an adorable little amp. I swear that was the first thing I thought when I opened the box. The packaging is minimalistic, but I paid for an amp, not a pretty box, so I'm fine with that. I'll spare you the details about it's look and finish, other than to say it's a good looking little amp.
When I first plugged in the IC cable, I noticed something odd. The cable was not sitting perpendicular to the faceplate. Indeed, I could move the cable freely back and forth and up and down. With some pressure I could impact the signal. Ick.
Out of the box the little amp drives the HD-580s, but the volume is at about two o'clock with normal listening volumes. No problem, open the amp and you can pop on some jumpers to boost the gain. Simple enough, but a switch would be better. In fact I'm surprised there's no switch for gain. This thing has variable defeatable crossfeed, defeatable bass-boost, auto power-off (4 settings!), an LED dimming feature (nice!) and a friggin' flashlight mode. A gain switch would have been nice. Anyway with the gain up, the volume is now at about 9:30 and I'm rockin'. The problem is that with the gain increased, there is an audible hum when using my Er4ps.
Actually - the hum got me thinking - it sounded like a good old fashioned 60Hz hum, and sure enough it was - the hum exists when the amp is plugged in. Since you can charge and play at the same time (assuming rechargable battery of course), I would do that - a lot. While on battery only, there is a slight hiss, but nothing I could hear with music playing.
The bass-boost is a nice feature, because to my ears the amp sounds a tad anemic. The problem is that with the base-boost enabled, I think it sounds too boomy. I am not a bass-freak and boomy bass is a sure way to turn me off. Between the two, I like the base-boost on.
The Cross-feed feature seems to be one of those love/hate things. On my Micro amp I love it - no - I *adore* it. It's subtle, but when you turn it off you miss it. Beautiful! On the XM4 the crossfeed is adjustable which is a nice touch. The problem is no matter how I adjust the crossfeed, I hate it. First the volume is cut significantly with crossfeed enabled. Second, it seems to sound even more anemic. Bass-boost to the rescue right? Not so fast. It's almost as if the cross-feed lowers all sensitivity, but the bass-boost only boosts the bass. Now it's even more boomy.
The volume seems to be uneven somehow on my copy. On low volume, when I slowly increase the volume, it increases first in the left, then the right. Also with the gain up and the ER4ps in place (low gain phones to be fair), I cannot turn the volume to "off". There is always sound. Once at normal listening volume this is not an issue, but now I wonder if the left side is louder than the right...
Now with all the negatives, I can almost certainly say, that if I did not have the Micro amp to compare it to, I would love it to death. The Micro has ruined me though.
For the price ($165 shipped with rechargable battery and adapter), it's a nice little amp. I'd be happier if it had better jacks, but otherwise the build quality is pretty solid. It can't compare with my Micro amp, but it's not designed to.
For my money, I'd spend the extra money and get a Hornet or one of the other premium amps. If that's not an option, the XM4 might be just the ticket.
GAD