Koss PRO4AA Headphones Considering the purchase of a pair of Koss PRO4AA headphones. I notice the impedance is listed at 250 ohms.... high. can anyone tell me if this poses any problems when using the headphones with a PC as opposed to a regular stereo amp? Koss PRO4AA Headphones Considering the purchase of a pair of Koss PRO4AA headphones. I notice the impedance is listed at 250 ohms.... high. can anyone tell me if this poses any problems when using... » Read More Koss PRO4AA Headphones Considering the purchase of a pair of Koss PRO4AA headphones. I notice the impedance is listed at 250 ohms.... high. can anyone tell me if this poses any problems when using the headphones with a PC as opposed to a regular stereo amp? « Show Less
1017590
I personally don't have any problems with using them with my PC, but since every PC is different at how they output sound it just depends on how much output your PC gives.This pair also doesn't need to be terribly loud since they have excellent sound isolation.
1017591
They sound great with my tiny Sangean DT-210 shirt-pocket radio. It has rave reviews for FM sound quality (look it up) and runs on just two AAA batteries. Since that little radio can drive these high-efficiency headphones nicely, I think nearly anything could.
1017592
Yeah...you need a REALLY good sound card to use these, and even then, it'd be better if you just stuck to using an A/V Receiver or something instead.
1748385
the 32ohm version is made to be run off just about anything, and still retain good volume and dynamics. the 80ohm is tuned for a bit more bass than the other models. at 80ohm it sits on the border of needing or not needing an amp. I personally thought it needed one when I listened to it out of my phone. the 250ohm definitely needs an amp, and is the most balanced sounding of the 3 versions. it's far from a balanced headphone though. I only say balanced in comparison to the other ohm versions of the same headphone. the 250ohm version is really made for a studio plugged into monitoring equipment. doesn't mean you cant use it at home, but you have to have an amp. just remember this with headphones, the lower the ohm, the more likely it will sound good just plugged right into a source. as the ohm goes up, volume and dynamics start to suffer, to the point that a separate amp will be required. if you don't want to use an amp, get the 32ohm.
920668
could be whoever advertised the headphone wasn't paying attention its more likely to be the 32 ohm like in the description. i use the dt990 250 ohm powered off the schiit magni 2 (Recomended) otherwise the 32 ohm version is a nice option for more compatibility with e.g. a smartphone, although these headphones are a bit too nice to take on the go.
1256937
Hi John, I am using this as a bedroom system and am powering a pair of Paradigm MK5 SE speakers (small towers) with it. I am running it through a DAC and just using a extra iPod as the source. It fills the large bedroom with beautiful sound and stout bass. You will want to make sure that your speakers have a relatively high sensitivity number - probably 87 or higher for best results. It really helps to smooth out the sound from a digital input. My father-in-law was so impressed with the sound, he just got one to power his Martin Logan bookshelf's. I have not tried to use it as a preamp, so can not comment on that. Overall, it's a great little piece for the price. Hi John, I am using this as a bedroom system and am powering a pair of Paradigm MK5 SE speakers (small towers) with it. I am running it through a DAC and just using a extra iPod as the source. It fills the large bedroom with beautiful sound and stout bass. You will want to make sure that your speakers have a relatively high sensitivity number - probably 87 or higher for best results. It really helps to smooth out the sound from a digital input. My father-in-law was so impressed with the sound, he just got one to power his Martin Logan bookshelf's. I have not tried to use it as a preamp, so... » Read More Hi John, I am using this as a bedroom system and am powering a pair of Paradigm MK5 SE speakers (small towers) with it. I am running it through a DAC and just using a extra iPod as the source. It fills the large bedroom with beautiful sound and stout bass. You will want to make sure that your speakers have a relatively high sensitivity number - probably 87 or higher for best results. It really helps to smooth out the sound from a digital input. My father-in-law was so impressed with the sound, he just got one to power his Martin Logan bookshelf's. I have not tried to use it as a preamp, so can not comment on that. Overall, it's a great little piece for the price. « Show Less
886316
These headphones can get the job done but if you want something that can just get really loud you need to look more into the specifications. Not sure what in particular is important but I know it comes down to physics. It may be the transducer/amp/or ohms. Try googling it. These headphones get loud and don't get muddy which is good as well. Try googling and read up on some stuff.
1368939
From what I read the amp is pretty good as well and could handle phones up to the HD650, which are 300 ohms I believe,. The DT 880s come in 32, 250 and 600 ohms models. So depending upon your model, the 600 Ohms would work, but would push the perfomance a bit. Some people with 600ohms headphones would still buy the Fostex for portability, and then might have a desktop amp at home. The opinion i gave is a uer's experience in the Head-Fi forum.
706723
Hi, this unit sounds amazing with my Sennheiser HD250 headphones, which are also rated at 300 ohms. It is an amazing piece of gear.
579661
I am using Philips X1, which is 30 Ohms. It has more than enough power for my taste. I'm not sure if a 250 Ohm headphone would work, without an amp.
1496263
It usually means 8 ohms is the recommended speaker impedance. Using lower impedance speakers like 4 ohm draws more power from the amp and can cause the amp to overheat. But generally in quality amps this will only be a real concern if u constantly blast music close to maximum levels. Some higher end brands will say they are 8 ohm but 4 ohm stable meaning they can handle the lower impedance
938663
Yes- & the impedance will be fine, these are Awesome super tweeters & will extend your frequency response amazingly! they can sound a bit harsh, which I enjoy, But if you think they are a bit too loud you could add volume controls to them or add a different capacitor on the plus side of the input terminals (BI polar 2.2uf or so) - or just adjust the tone control of your amp/receiver! Well worth the price! great tweeters!
2186486
These are the specs direct from their website. From my own personal experience, my laptop does just fine. I have not amped them personally, but I have read (online) that they do improve with amping. Also driving them from my iTouch is good. Just switch off the EQ and they sound great.Type: Dynamic, semi-openDriver: ¨ª50 mm, neodymiumSensitivity: 98 dB SPL (1 mW)Frequency Response: 10-30,000 HzMax. Input Power: 300 mWRated Impedance: 56 ¥Ø (Copper-coated aluminum wire)
291498
I'm afraid I can't say exactly how that particular Sennheiser will sound, and it doesn't really make sense to ask. But, it is the best headphone amp for the money, probably for 3 Times the money, and there is nothing odd about the ohm rating of the Sennheiser, so it's worth the purchase.
583310
one more thing i forgot to mention son. remember this system is a 4 ohm system. you cannot hook it up to a "normal" stereo receiver because they are almost all wired for 8 ohm. my son`s friend bought these after hearing them at my house and hooked them to an integrated amplifier his buddy gave him and blew them up. my apologies if you already were aware of this.
1603431
Thanks for the replies. Will keep it in mind when I am ready to buy a headphone amp.
1386824
I dont know the impedance of the qc15's, but if the ohms are 50 or less, i dont think the e17 would help very much. Low impedance headphones usually do not require much help from amp/dacs. I really can only talk about the e07...only slight improvement due to bass boost when plugged in to my PC/i Tunes. My Acer PC seems to power my sennheiser 598 or Audio tech ATH-50's very well. If you are using i-phone or Gallaxy mobile devices, portable amp/dac is essential. I hope this was helpful.
760996
it sounds tiny because it is 150 ohms so it needs an amp to push it but the pc 360 are 50 ohm and dont need an amp ... jus look for a headset with 50 or less ohms and u wont need an amp
206112
The 250 ohm pros have a little more bass and clamp a little tighter around your head. The difference doesn't amount to much, and it certainly doesn't amount to paying $200 extra. Just go with the pros and you'll be good. You also shouldn't have a problem with your Sound Blaster Z and these.