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I remember back in the eighties my father having a pair of these headphones. Which prompted me recently to find a pair. Well I’m about 7 pairs in so far, and have finally found a fully working pair that the pads have not gone flat on. You will read online that Koss will supply replacement pads for only $5.00!! Which is fine if you living in the USA, but equate to about £60 in the UK via a European spares supplier. The biggest issue I have found with vintage pro 4aa’s is either open circuit drivers, faulty jack leads, and even the cable running through the headband. The biggest and most painful fault is the fact that the ear cushions shrink, and go hard. To a degree you can split the pads open and fill with foam, but this is by no means ideal, as ear cushions on most headphones do have an effect on overall sound quality. If you do get a good pair, you will be pleasantly surprised with the sound quality. They really are good, considering the design is over 40 years old. They are not lightweight, and not the most comfortable headset, but I found this was easily made up by the neutral and controlled sound quality. Not as flat as a pair of DT-100’s, but certainly more suitable for studio and easy listening. The impedance of 250 ohms does render them not the loudest phones for use with portable devices, and they are not exactly a fashion statement. But for home hifi, or I’m the studio, they will handle a pounding. I have many pairs of vintage Koss headphones, and these certainly were the most pioneering model they made. However the pro 4aaa is more comfortable and sound marginally better, even though they have a similar driver configuration. I’m not saying they beat modern helpings from Sennheiser, AKG or Beyer. But for the curious audiophile or collector, they are worth a go.Read full review
Verified purchase: Yes
I bought a pair of these back around 1970 (I remember they cost me about a week's wages), and they are still going strong after nearly 50 years, which is a testament to their build quality. The original ear cushions were oil filled, which had a tendency to dry up over time. The sound quality is fantastic, and they are driven perfectly well from my PC sound card without any additional amplification, but, as others have pointed out, they are big and heavy, and not really suitable for use with portable music players. But if you want something for home hifi listening, or as on-ear monitors for sound recording/mixing, they are hard to beat.
Verified purchase: No
These headphones are from the 1970s and are fairly heavy, but have a very good sound and decent noise isolation from the outside world. I've been very impressed with mine. One thing to note is that, whilst a mobile phone or MP3 player will drive these, they're quite high resistance and prefer proper hifi amplification or, preferably, a dedicated heaphone amp for best results.
Verified purchase: Yes | Condition: Pre-owned
Excellent sound crisp and clear comfortable to wear but heavy which I don't mind like most vintage equipment they were made to last
Verified purchase: Yes | Condition: Pre-owned
I like them. They are very good quality and they sit tight. The one point-short is intended for me, not for the headphones. I was looking for something light to wear on my jogging round, but these are Heavy-duty professional studio headphones, so that's something you should think about, when considering these headphones.