[chrisgeary]

Sennheiser PXC450 - £166 from dabs.com although I think they are nearer £200 normally
Bose Quietcomfort 2 - £225 from bose

The purpose of this review is to assess the sound quality of both headphones regardless of the environment they are used in. I have reviewed them in a hotel room with very little in the way of background noise. My source is a lowly Apple iPhone with MP3s created from WAVs using VBR-3 (approx 190kbps files).

Testing the Headphones

They are both noise cancelling headphones. The Bose were tested with noise cancelling ON, largely because they don't produce any sound when off. The Sennheisers were tested ON and in bypass mode.

I used a variety of tracks:
Faithless - To All New Arrivals - Music Matters (For its velvety sound)
Hybrid - Morning Sci-Fi - Blackout (Another velvety track but a little dancier)
BT - Monster - Various Tracks (Wider dynamic range, 48khz audio)
BT - This Binary Universe - See You On The Other Side (As above)
Sarah McLachlan - Surfacing - Angel (Soft vocals)
Sarah McLachlan - Surfacing - Do What You Gotta Do (as above)
Norah Jones - Come Away With Me - Various Tracks (silky vocals)

Physical

Both headphones are over the ear designs, so they don't sit on your ears. I think this is a generally a more comfortable design. I know that my reference Senn HD25-1s are not comfortable after an hour or so. The PXC450s are physically larger than the QC2s - they could certainly accomodate the larger ear, whereas the QC2s seem to be the perfect size. The pressure on my head is about right with the QC2s. The PXC450s are firmer, and whilst not uncomfortable for longer listening sessions, you are aware of them more so than with the Bose.

Another thing worth mentioning is that I am a wearer of spectacles. This is not a problem for the QC2s but the PXC450s seem very sensitive to the seal around my ears. There is a bass drop if I have my glasses on, as if the seal is no longer 100%. This is not the case with the Bose phones, they don't care whether I have glasses or not!

My ears felt contact with the innards of the 450s at times. Not uncomfortable but not an issue with the QC2s.

One last thing to mention is that because the PXC450s are larger, there is more scope for misaligning the phones to your ears - a different sound can be obtained depending where you wear the cans. I think they are supposed to be worn with your ears towards the back of the phones - it sounds and feels wrong middle to front. Again, the Bose fits perfectly every time and doesn't suffer from this variation.

Both sets can be used in noise cancelling mode with their cables detached. They both use a single AAA battery integrated in one earphone. The 450s have extra controls for volume and a talk-through function, which is a bit gimmicky but works quite well if you can't be bothered to take them off.

Sound

So lets get down to it, how do they sound? I'll break this down into four sections: bass, midrange, treble and the whole picture.

Bass: This is an interesting one. The PXC450s have almost too much bass in bypass mode (and without glasses!). Engage the noisegard circuitry and the bass drops significantly. The effect seems to be slightly less on a plane when there is a lot of low frequency noise to contend with, but nonetheless they are bass light when in noise cancelling mode. The QC2s only run in noise cancelling mode and they are unaffected by glasses so they perform consistently in this department delivering a balanced mix I would say. Not bass light, not bass heavy. However, they are not as detailed as the Senns. Bass notes are lost in a muddy warmth. Warm is probably the right description, the sound is warmer but somehow confusing. There is not the depth or scale either that the Senns can deliver (when you get the right combination of specs/modes etc). The bass presentation is much larger, wider. The Bose sounds boxier. Enable noisegard on the 450s and this changes, they lose their depth and scale but remain composed, never muddying the audio.

Midrange: Both perform well vocally, delivering plenty of detail. The soundstage, again, is slightly better on the 450s. There seems to be a slight lift in the presence band on the QC2s that makes it sound boxy. The Senns sound open, light and airy.

Treble: The 450s have oodles of detail and never sound harsh or sibilant. The same can be said of the Bose too, but I would say they have slightly less detail and because of the boxy bass and midrange, this takes the edge off the overall presentation.

The Whole Picture: The 450s have a light, airy, big, deep and powerful presentation. They deliver subtly when required and power if its needed. The QC2s have a chunky, slightly muddy less defined presentation that doesn't quite hit the spot.

On A Plane

Ok this is a bit unfair as I've not taken the QC2s on a plane but I have sat a 10 hour flight from London to San Francisco with the 450s. Firstly, they cancel plane noise unbelievably well - If i could measure the drop in db I would. As I have to describe it instead, its like pressing the mute button on your hifi and the audio dropping 20db. I expect the QC2s would perform in much the same way. I also expect the QC2s to win the long term comfort test but that said, I wore the 450s for 8 hours of the 10 with two short breaks in between. Aside from getting slightly moist ears, I felt no discomfort at all. Unlike my reference HD25-1s which leave my ears sore after about 1 hour. Ok they are on-ears!
Incidentally, the same picky seal that loses bass when I wear my specs also lets in plane noise, so I had to wear my specs outside the phones. Not a big deal but I don't think the QC2s suffer this problem.

Summary

Sennheiser PXC450

These headphones are physically massive and they have a big sound to go with their size. To me they are more like having speakers on my ears - I mean that in a good way. Yes they are large, but they also sound hifi. Unfortunately, they are let down by noisegard robbing them of bass in operation. They are also let down by a picky seal that does not like spectacle wearers. They do cost less than the QC2s and if the PXC350s (which doesn't have talk-through) sound the same as the 450s, then they are a real bargain and undercut and outperform the QC2s considerably. Even at dabs current price, the 450s have set a new benchmark in performance and value.

Bose Quietcomfort 2

Comfortable and easy to live with. They don't have the scale and authority of the 450s but they aren't far behind. They are let down by a muddy bottom end that robs the user of detail. One could argue that not being able to use them as normal headphones without noise cancelling is also a negative. Not being fussy about specs is good. They don't convince if you want headphones to use at home.

So which am I keeping? Its a little bit of a tough one. One the one hand I like how easy the Bose cans are to live with. They sit nicely on my ears, their presentation is consistent, they get on with my specs, they are smaller and slightly more comfortable. On the other hand, the sound quality of the PXC450 is way ahead of the QC2s. The fact that I wore them for 8 hours of a 10 hour flight says that I can live with their bigger frame. I can also live with their picky seal and ear position. I'll be keeping the Sennheisers!

PXC450
Detail, subtly, velvet, open, great soundstage, power, control. Spine tinglingly good! Just awesome. Perhaps a little bass heavy. Audiophile headphones that happen to have noise cancelling as an extra.

QC2
Unfussy, nice but muddy, boxy and constricted. Decent headphones but they aren't normal headphones as well as noise cancelling.

[john59]

http://www.dabs.com/productview.aspx...ationKey=50404

[mrm3]

Just wanted to say thanks for the review.

Waying these 2 up at the moment.

Bose QC2 - can be bought at Heathrow for £191.
Senns pcx 450 - dabs.com still by far the cheapest at £176.

[HiFi Headphones]

Thanks for the great review Chris.

I'm in agreement about the sound quality of the Sennheiser PXC450 over the Bose QC2.

One question. How would you rate the build quality of the Bose QC2 over the Sennheiser PXC450?

I'm not that impressed by the build quality of Bose headphones. In fact I don't quite understand what the hype is all about. So many people think that Bose make the best headphone ever!

[chrisgeary]

The Bose look dated, it has to be said. The PXC450s feel chunky (well they are larger) - they have a solidity that the QC2s don't quite have. That said, the QC2s are definitely lighter. I've heard many reports of QC2s breaking quite easily - its too early to tell whether the PXC450s have any build defects - but mine are absolutely solid so far!

I think Bose QC were good at the time, but things have moved on and Sennheiser have raised the bar quite considerably.

[mrm3]

Thx

Do you reckon the cheaper Senns PXC350s would be equally good at the noise cancelling aspect if not as good audio wise?

Think I will probably get the PXC 450s ! On your head be it ! Well my head I suppose.

[mrm3]

Just noticed this on a review/marketing doc.

NoiseGard noise compensation technology actively neutralises unwanted noise: a tiny microphone mounted on the outside of the headphone picks up ambient noise, a processor calculates and superimposes the relevant phase-inversed sound signal. The result: the two acoustic signals cancel each other out and the unwanted noise no longer reaches the user’s ear. In the case of the PXC 350, the tried-and-tested NoiseGard Advance system reduces unwanted noise by up to 85 per cent, while the new NoiseGard 2.0 system featured in the PXC 450 actually reduces noise by up to 90 per cent. In this latest system, the filters, microphones and processor efficiency have been optimised to ensure a virtually unrestricted sound experience even in high-noise environments.

[chrisgeary]

I've wondered about the 350s on several occasions - sound-wise and their noise cancelling ability. I think I prefer them in black too. Lets ask ourselves though, what is 5% in reality? If 20db is a realistic figure for noise reduction, then 5% of 20db is 1db - which is barely noticeable IMHO. Perhaps Noisegard 2.0 covers a slightly wider spectrum, which would make the difference greater in terms of our perception.

That said, outside of a noisy environment, if the 350s sound the same as the 450s, they are surely a bargain headphone.

[Victor ch]

Well, yeah, long time reader first time poster.

Thought might say a word or two. I happen to own a pair of QC2's and Im looking for the 450s as an 'upgrade'. Buying Grado's and Bang&Olufsen's made me dislike the Bose's quite a bit, thus me wanting an acoustic performance similar to the once I mentioned but with noise-canceling (I take the school bus so )).

Just to make my point I want to mention Bose ones are actually just average sounding, at least to me. Owning a hi-fi setup, 'hi-fi headphones' and good on-the-go earphones (B&O) I got used to really great sound, this is were Bose can't deliver. Even with Lossless (which makes up 60%+ of my library) the QuietComfort's seem just to boxy as the OP said, and muffled I might add. Listening to some Dispatch or other acoustic sessions further accentuate Bose's decision on making the QC2's rather poor sounding, I'll say the midrange is close to non-existent with these, too much muddy bass and weird (can't say other thing) treble muffle the already poor performing midrange. Just my two cents

I'll post back when I buy the PXC450s

Thanks,
Victor

[chrisgeary]

Welcome! I'm looking foward to hearing your views.. I think we both have the same opinion about the QC2s...

[Victor ch]

Originally Posted by chrisgeary

Welcome! I'm looking foward to hearing your views.. I think we both have the same opinion about the QC2s...

Yeah, Im actually craving them pretty badly, I really enjoy having my own concert hall within the bus, but if its a Bose concert hall is not the best there is I hope these Senns will perform beautifully, Im like 2 months away from them :P I'll post a lengthy review when I get em.

Victor

[Monopot]

How are the PXC450's for general listening outside of music? Was thinking of getting some for next time I fly (oz bound) as my in ear CX300's get a little uncomfy after a while, but recently wanted to get some headphones to use my 360/ps3 at night.

Thought instead of getting a dedicated headphones for this, if I can use the PXC450's as well (just via TV headphone out) this would solve the problem, but how do people get on with them like this? Obviosully I'll need an extention lead as I take it that its quite short?

Thx!

[chrisgeary]

Yeah you'll need an extension unless you like sitting 1m from your TV

They are fairly neutral sounding headphones, if a tad bass heavy with noise cancelling off. For gaming I would imagine they would rock.

[Monopot]

Originally Posted by chrisgeary

Yeah you'll need an extension unless you like sitting 1m from your TV

They are fairly neutral sounding headphones, if a tad bass heavy with noise cancelling off. For gaming I would imagine they would rock.

Thanks. Not had over the ear phones before so may have to go and try some somewhere first but so far they are looking a good bet.

BTW - Looked at your photo link in your sig. Love the Oz ones!!! I'm going to to live there next year, just waiting for visa, so can't wait!

[Monopot]

Originally Posted by chrisgeary

Yeah you'll need an extension unless you like sitting 1m from your TV

They are fairly neutral sounding headphones, if a tad bass heavy with noise cancelling off. For gaming I would imagine they would rock.

Ordered a pair of PXC350's today. Looked at lots of different headphones, ended up realising I need closed back as don't want the sound coming out and annoying the misses etc.

Was really tempted with the PXC450 but thinking about it more, the only real difference for me would be the talkthru which I wouldn't use often enough so I thought I'd save myself the £80 and get the PXC350's instead. Did look at the ATC-ANC7's but the reports of noise leakage put me off, whereas the PXCs seem to hold the sound pretty good.

Will post how I get on with them when the arrive.

[chrisgeary]

Yeah will be really interested to know what you think of the 350s. I had the ANC7s as well, but they sounded terrible, especially when noise cancelling. The effect was pulling my ears to one side - most bizarre.

[Monopot]

Originally Posted by chrisgeary

Yeah will be really interested to know what you think of the 350s. I had the ANC7s as well, but they sounded terrible, especially when noise cancelling. The effect was pulling my ears to one side - most bizarre.

Fingers crossed they should be here today if Royal Mail keep the pace up.

Wishing my 5.1 system had a headphone out but oh well, limited to the headphone out on the TV instead

[Monopot]

Originally Posted by chrisgeary

Yeah will be really interested to know what you think of the 350s. I had the ANC7s as well, but they sounded terrible, especially when noise cancelling. The effect was pulling my ears to one side - most bizarre.

Well got home and my PXC350's were waiting for me. Tried them on my iPod Touch, PS3, 360, AppleTV and MacBook Pro and come the following conclusion.

They are already boxed up to be returned to Amazon

Buildwise I thought the felt quite plasticy. They were also very light which was a surpise but this isn't a bad thing. Fit wise they weren't great as I was expecting the ear padding to be soft but it actually felt quite stiff. I tried some QC3's in the Apple store and the padding on these were V.soft, unlike the PXC350s.

Sound wise it went downhill. Currently I use Sennheiser CX300's on my iPod and have it around 10% volume. To get a comparable level on the PXC350's I had to turn the headphone volume to full and then have the iPod at 50% without NC and even higher with NC. The sound was also very tinny and lacking in bass or depth. I tried adjusting the EQ but no joy. The misses tried them and didn't like the sound one bit.

Next was the games consoles. Again volume was lacking and very little bass to be found There was however a better increase in fine detail compared to my current CX300's but the sound just felt flat and tinny again. NC made it worse so, and also because I had to turn the volume on the TV much higher with the PXC350's to get any decent volume out they were leaking more sound than I expected, much more than my CX300's because I could have them on a much lower volume.

I tried them on a film just to see how the coped here and they were abysmal! I put Transformers on at the first seen when the helicopter transforms. There is a total lack of bass or immersion and you could barely hear the gunfire. My CX300's at least had a bit of umph but still lacked.

Overall its a big for me. Not impressed at all with the sound quality as I was hoping for a big jump like the first time you bin the bundled Apple earphones but unfortunately it wasn't to be. I might look at the HD555's instead now considering how the PXC350's leaked sound at the high volume required, or I might just invest in some better in ear models.

Oh well. Wouldn't have thought my £15 CX300's would end up being the ones being kept.

[chrisgeary]

Assuming the 350s and the 450s aren't a million miles apart in construction and sound quality, lack of bass (with NC off) is not something I would have predicted. Agreed they are bass light with NC on but I have to EQ the bass DOWN on my iPhone for my 450s with NC off. And yes, I agree with the comfort issue, the QC2s definitely won that one. Maybe the 350s aren't built to the same specification. I can't help feeling, though, that you had some sort of issue to find the CX300s the keepers.

[Monopot]

Originally Posted by chrisgeary

Assuming the 350s and the 450s aren't a million miles apart in construction and sound quality, lack of bass (with NC off) is not something I would have predicted. Agreed they are bass light with NC on but I have to EQ the bass DOWN on my iPhone for my 450s with NC off. And yes, I agree with the comfort issue, the QC2s definitely won that one. Maybe the 350s aren't built to the same specification. I can't help feeling, though, that you had some sort of issue to find the CX300s the keepers.

Yeah me too really. The reviews of both the 350's and 450's were always really good so I was expecting a lot more from them considering the price. Maybe its the fact that I've just got used to having in ear headphones now and going to overhead ones like this just didn't suit.

I know the 350's should have blown the CX300's out the water quality wise and perhaps if they were a little bit better I could have lived with it, but as they felt worse to me I just couldn't pay £100 for them like that. Maybe I had some duff ones?

The volume issue was something I really wasn't expecting either. For me sitting at home in a quiet room to have to put the PXC volume at full and then my iPod at 60% wasn't a good impression, when my CX300s only need 10%. At work when I use my MM50ip's with my iPhone (basically CX300s with a mic) the volume doesn't go this high when I'm in the data centre, so the PXC350's would be unusable in that situation.

Oh well, think I'll have a look at some higher quality in ear headphones now instead.

[Monopot]

OK for completeness sake I thought I'd drop a quick update in.

In the end I went for some Sennhieser HD555 over ear open headphones and they arrived yesterday. WOW!!! I was not expecting that I can say, it was like the first time you try decent earphones after those crummy ipod ones. I tried them in my iPod Touch, MBP and my TV headphone out for my 360 and the clarity/details from these headphones is amazing! There is also enough bass there for me which I was worried about as when using my CX300 they were quite bassy, but the HD555 although less bass, they more than make up for it in detail. The bass is still there just not "fake" if that makes any sense.

They really did shine even more though when I ran them through my MBP for some music. They are just crisp, refined, detailed and also extreamly comfy to wear. I also wear glasses and its not a problem for these at all which is good.

Sound leakage occurs but not massivly and the misses said its not at a level which is a problem so thats good. Overall I'm very VERY happy with them.

Problem is, I now realise my CX300's are lacking so will end up looking for some new in ear ones for out and about now. Possibly Shure SE102's?

Overall though I'd highly recommend the HD555!

[chrisgeary]

I had a chance to listen to the PXC350s the other week, a colleague brought a pair in. You're right, the construction of them is very plasticy. Nothing like the solid build of the 450s. The sound quality isn't as good either. I imagined the 350s to be the 450s without talk-through, but they really aren't. Glad I went for the 450s now.

2 years on, they are still as good as new. They've survived several plane journeys and perform brilliantly. The build quality is clearly excellent. I'm still not keen on the bass hump in bypass mode nor the lack of bass in NC mode, but too much bass in headphones is a rare thing and thankfully it can easily be EQ'd out in iTunes or just by wearing my glasses! The gap the arms of my glasses creates is enough to reduce the bass output to ideal levels. Overall, I'm still very happy with my 450s, they still impress with the detail and transparency, not to mention the sheer depth of bass response and the scale that comes with it.