I’m still in the midst of writing my RED review but I did a number of measurements today using my normal clone 711 coupler.
Here’s the standard measurement. Some very minor channel imbalance. As usual, above the ~8 kHz artifact it’s not accurate and I would say I don’t notice that apparent 13 - 14 kHz peak.
Here it is against the 10 Ω Bass+ Adapter. Adds a healthy amount of bass and lower mids.
This is the same graph as the above with the Bass+ Adapter but unaligned. The key message here is that at the same volume, the Bass+ Adapter attenuates the full-range 7.8 mm driver to increase the perceived bass response. You’ll have to increase the volume to reach the same listening level as without the Bass+ Adapter. Most people already know this but just wanted to point it out for those unfamiliar.
Here is the original Truthear ZERO vs RED.
And if anyone was wondering how the Bass+ Adapter works with the original ZERO.
Finally, let’s look at the comparison between tips.
Here is the narrow vs. wide bore tips. Note I am using the Small size tips to do this measurement because the Medium size will slide out of the coupler. We can see that there is some difference but given that it’s in the treble region, I’d take it with a grain of salt and defer to Resolve’s measurements. I’d have to sit down and really AB test these tips to see if I can hear a difference and honestly, I think it’s less important than picking the one that best fits you.
Here is the Narrow vs. Foam tips. We can see that they look quite similar to one another.
Finally, here’s all the tips compared.
This next graph is more of a “proof” that the size of the tips (small vs. medium) should measure pretty much identically as long as you properly match the seal and insertion depth. I think most people already know this but wanted to include it here in case anyone was going to comment about how my measurements for the Narrow vs. Wide bore tips is wrong because I used the small tips.
Finally, whenever there’s a dynamic driver IEM with venting ports, people invariably want to know what happens if you block them. So here it is.
Looks like any hopes that blocking the vent will turn it into ungodly bass cannons ala the Tin Audio T2 have been thus broken.
And compared to the original ZERO.
The way this response looks reminds me of the 64 Audio Trio and Fourte actually… that weird mids hump.