# iFi ZEN CAN Signature 6XX (Amp) **URL:** \ **Category:** DACs and Digital\ **Created:** [July 6, 2020, 4:13am UTC](https://forum.headphones.com/t/ifi-zen-can-signature-6xx-amp/7407 "2020-07-06T04:13:37Z")\ **Posts on this page:** 1\ **Showing post:** 13
**Author:** ![Resolve](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.headphones.com/resolve/32/51647_2.png) [@Resolve](https://forum.headphones.com/u/Resolve)\ **Post date:** [July 31, 2020, 9:33pm UTC](https://forum.headphones.com/t/ifi-zen-can-signature-6xx-amp/7407/13 "2020-07-31T21:33:43Z")
Here are some measurements and comparisons done on the GRAS 43AG between the ZenCAN Signature’s bass boost and that of the ZenDAC. ![HD6XX Bass Boost Comparison](https://us1.discourse-cdn.com/flex016/uploads/headphones/original/2X/a/ad41ad70011e83cfd24e53b06e73fbe7d388f9c1.jpeg) Note that the green line is the ZenDAC and not the ZenCAN non-signature. I’m still investigating that. But in essence, the ZenDAC’s ‘Truebass’ gives it a lot more energy than the Signature ZenCAN’s ‘HD6XX’ button. Also important to note is that the ‘HD6XX’ button also boosts 5-6khz by a noticeable amount. I’m not sure if this is actually a good thing, since one of the things I really like about the HD6XX is that it’s on the smoother side, and this gives it a bit of a peak there. Speaking with one of the reps, apparently they did do quite a bit of research on this and that was a preference for a lot of people. I’m just not sure it’s what I personally want out of the HD6XX. But maybe that’s also because I like the HD6XX to be smooth, and for some it may be a bit too laid back. Fun how subjective this hobby can be. For the bass differences, if the non-signature ZenCAN is similar to the ZenDAC’s truebass, then this difference may just be similar to the difference between Harman 2018 bass and Harman 2013 bass. I prefer the latter. Interestingly, the Signature ZenCAN’s bass boost does put it pretty close to that: ![HD6XX Bass Toggle](https://us1.discourse-cdn.com/flex016/uploads/headphones/original/2X/1/1ecdd5f1cdc322388ed807d7c2944a86d068bfbb.jpeg) --- _[View the full topic](https://forum.headphones.com/t/ifi-zen-can-signature-6xx-amp/7407)._