Hello fraseyboy,
It might be too late for you, but below is the link to the original
Sony catalog page (1981):
http://www.audioidiots.com/merk.appa...pparaatID=2312
According to the catalog they are rated 20Hz-20KHz.
I do own them since 1987, and I got them used. So, mine are probably at
least 20 years old.
According to my research they are Sony professional monitoring series (pre MDR-V6). If you check online they are still in use in some recording studios.
Phones are extremely well built. It is a pleasure to look at them, to my taste they look better compare to my ATH-A900. The pads are glued directly to cans, they are made from leather or synthetic leather, but they still look pretty good.
If you buy them online most likely you would need to replace the cable. I just replaced the connector and shortened the cable because it broke in the place where it enters the driver housing. You can totally disassemble phones, but you would need to remove pads
in order to do that.
They are closed type and cover my ears, but pads are very shallow and I need to take
them off after 2h or so. Compare to my Sennheiser HD 25-1 they are more comfortable. I can not listen to HD 25-1 for longer than an hour. Compare to ATH-A900 they are not as comfortable, I can listen to A900 for 3-4hours without taking them off.
I do not know their impendence, but they are very easy to drive, in fact they are by far
the easiest to drive phones I have.
Besides ‘Sony DR-S3’, I have the following phones: ‘Audio-Technica A900’, ‘Sennheiser HD 25-1’, ‘Panasonic RP-HT355’.
The sound I can not really judge because I am not an audiophile by any means.
I am almost 100% listen to my MP3/FLAC collection via Indigo Echo DJ CardBus card.
Still, here is my opinion. I think they sound pretty good for their age. After I fixed the cable I realized that the not so good sound I used to hear was due to the aging cable,
but not the drivers, in fact now I enjoy the sound signature they produce. Sony produces very warm, probably too warm mids, bass is there, but it does not stand out as in
HD 25-1. I use HD 25-1 with HD 650 cable and they produce way too mach bass to my ears. The same with highs, they are there, but they are not as visible as in HD 25-1. I think Sony have a typical vintage sound with a lot of mids where voices and classical would
be the best. For a lot of recordings I prefer DR-S3 to DH 25-1. To me they allow to enjoy music more and that is very important to me in the end of the day. Technically wise
I think HD 25-1 are superior (more detailed, extended lows and highs), but Sony just sounds better to my ears.
Compare to ATH A900 Sony is not to the same level. I think A900 are technically superior. However I do not like A900 mids. I do not know what is wrong with them, they sound too cold and analytical to me. Again there are some recordings there A900 are just a bliss to my ears. There some recordings there I can not stand them, yes I can hear all of details, but there is no body to the music. I think A900 have a problem to render nice warm mids and comparing them to Sony just makes it more pronounced.
Compare to cheap ‘Panasonic RP-HT355’, I would choose Sony any day, Panasonic’s pedestrian sound is just that, it does not carry you away as better phones do. One thing though, they are a bit more comfortable to my ears compare to Sony.
So far I did not find my ideal closed headphones yet. I was betting on A900, but their mids are not for my ears. HD 25-1 are way uncomfortable, tiny soundstage and bass hurting my ears. Sony DR-S3 have nice vintage sound, but technically outdated. So, till I find my ideal set I use DR-S3, HD 25-1 and A900 depending on my mood and type of music I am listening to.
In any case I think Sony DR-S3 are a good headphones for a collection. They have a very enjoyable sound signature and just looking good after many years of using.