[productred]

For my preferences, 1650 hits all the right notes. It also helps that the earpiece looks glamourous in black and gold. 1670 is no doubt more neutral, with faster transients, more apparent note texture and airier than 1650, but I notice some sibilance in the treble with my testing (WM1A, stock single-ended 1670 cable). I listened back and forth a few times just to make sure. And the 1670 had some "ttt" and "sss" hotness at some passages at say, Hotel California. At that instant the warmth, tone, naturalness and forgiveness of the 1650 seemed more alluring although less technically proficient. So for looks, pricing and ultimately the sound, I'd take 1650 any day of the week. Once again it's a preference game, don't take my word as gospel.

I have to agree on the looks point. If only the 1670 could sport one of their fancy colour combinations...............

I found the 1670's treble airier than the 1650. On balanced (with the 035 cable) I heard no sibilance whatsoever, while the trebles are hotter on both when on single end, with the minor swelling in hi-mids on the 1650 easing it a bit more than the flatter 1670. The siblings are very easy to be driven out of any source, but the extra power on balanced means better control at both ends of the spectrum.

With all that said, caveat is I have the 1551 and quite naturally would be less likely to be impressed by the very, VERY similar sounding 1650.

 

[ZenErik]

Makes me want to give the 1670 a shot, but it's a shame that I really have no opportunity outside of blind buying. Loaner tours for Acoustunes where they aren't easy to find would be amazing.

 

[productred]

Makes me want to give the 1670 a shot, but it's a shame that I really have no opportunity outside of blind buying. Loaner tours for Acoustunes where they aren't easy to find would be amazing.

I'd say it is a pretty safe investment for blind purchase as the tunning is balanced, sound is transparent and pretty accomodating.

 

[ZenErik]

So who’s gonna get a HS1690 TI?

https://twitter.com/acoustune/status/1045840804189634560?s=21

 

[OverlordRush]

What's the different between the ARC35 and the ARC33 cable? Their spec looks the same on accessoryjack, and the ARC33 is $120 cheaper.

 

[productred]

What's the different between the ARC35 and the ARC33 cable? Their spec looks the same on accessoryjack, and the ARC33 is $120 cheaper.

The 35 uses the Pentaconn OFC 4.4mm plug which costs a fortune.

 

[OverlordRush]

The 35 uses the Pentaconn OFC 4.4mm plug which costs a fortune.

is it worth the extra $120 tho?

 

[productred]

is it worth the extra $120 tho?

Yes or no. Not a good value, but does sound a tiny bit cleaner and also gives you peace of mind.

 

[OverlordRush]

Yes or no. Not a good value, but does sound a tiny bit cleaner and also gives you peace of mind.

too late... already ordered it thanks for the info

 

[productred]

too late... already ordered it thanks for the info

You'll enjoy it, I got the 35 myself as well and never regretted it.

 

[audionewbi]

I just came from Singapore, which was a very fun, productive and growing experience, nevertheless, I couldn't help but wander around many amazing local shops and try the gears I was interested.

Among the number of products, I tested the Acoustune IEM stood out the most for me, especially the 1650Cu, which I prefer more than the 1670SS.
The sounds were a wide U sound, very clean and the driver was very responsive.

 

[blazinblazin]

I just came from Singapore, which was a very fun, productive and growing experience, nevertheless, I couldn't help but wander around many amazing local shops and try the gears I was interested.

Among the number of products, I tested the Acoustune IEM stood out the most for me, especially the 1650Cu, which I prefer more than the 1670SS.
The sounds were a wide U sound, very clean and the driver was very responsive.

I found the new fw 3.0 for WM1A matches 1650 really well in Balanced.

 

[seenc]

I just came from Singapore, which was a very fun, productive and growing experience, nevertheless, I couldn't help but wander around many amazing local shops and try the gears I was interested.

Among the number of products, I tested the Acoustune IEM stood out the most for me, especially the 1650Cu, which I prefer more than the 1670SS.
The sounds were a wide U sound, very clean and the driver was very responsive.

after some head-on comparison with 1670, I also have preferred the cheaper version(1650). despite the slightly lower details and the brightness, 1650 has a more balanced sound without undue emphasis at the top, especially that reveals on sibilant.

btw the combo AK SR15 with 1650 is great! there is nothing to complain about.

 

[OverlordRush]

Just got the ARC35 cable for my 1650. Compare to the plussound EXO silver plated copper cable, the ARC35 give the 1650 more rumble and less forward mid-bass, female vocal is also more forward. I would recommend the cable 100% for all 1650 owners.

 

[productred]

The 2 reasons why I get the 1670 instead of the 1650 are

1: I have the 1551cu and the 1650 doesn't sound all that different, same signature, just a marginal improvement on details which isn't of paramount importance given the signature of the cu siblings
2: I can hear some nasal quality in the vocals of the cu siblings, a minor swelling in the 4-6k region which is not present in the 1670 - the 1670 sounds more balanced and open to me and the transition from mids to highs is smoother and more coherent.

With the tiny bit of extra colouring, the 1650 is actually fairly enjoyable, just not what I needed for the moment. Technical level of the two should be considered as the same.