May 2, 2022 at 8:32 PM Post #62,536 of 150,849
How hard are these to drive? Specs look fine but they don't always tell the true story.
your right about specs being misleading some time...i cant confirm 100% but it seem they benefit from amping power, they sound the best out of my 2 most powerfull dac-amp dongles which are Tri TK2 (1250 freakin mw) and Xduoo Link2 Bal (270mw@32ohm).
With FIIO KA1 my impressions would be very different, it sound very compressed, brightish and small in spatiality. Don't like them with this dongle (45mw@32ohm).
 
May 2, 2022 at 8:37 PM Post #62,537 of 150,849
Problem with me is that im open minded with tonal balance but right now my fav IEM are my IEM in uses in fact. Their ALOT...(out of review obligation)
I tend to like well balanced tonality with good technicalities wtv the signature, W, U, V, harman, diffuse wtv. Im allergic to thin timbre most of time. I listen more to female vocal yet what affect male vocal affect cello which i listen alot too...
Now that i listen more to Waist Drum, i confirm they are source sensitive as well as amping hungry (scale up), bass is the part im not sure to like, it have warm thumping and definition is vague...extension of HZ Mirror is better yet not as warm punchy....
I tend to judge all IEM as if they all cost 1K too...until i score the sound value part.

Im confident to say HZ Waist Drum are great, not so much about how their musicality will be judge since they are gently bright neutral with slight mid bass boost, quite maturely tuned.
Much appreciated. Doesn’t look too hard to drive, a bit lower sensitivity and impedance than average, so an amp with low impedance with juice to spare should do the trick.
 
May 2, 2022 at 8:49 PM Post #62,538 of 150,849
Much appreciated. Doesn’t look too hard to drive, a bit lower sensitivity and impedance than average, so an amp with low impedance with juice to spare should do the trick.
The lower impedance is just one number - it does not tell about fast transients at high currents.

The best test of the source, in my experience, is the ability to drive an IEM with some resistive load to sound the same - it means that the source can provide higher currents without any distortions of the frequency response.
 
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May 2, 2022 at 9:00 PM Post #62,539 of 150,849
I need the graph ASAP

Just received the HZSound Waist Drum I bought on Amazon two days ago (bought from KeepHIFI shop at a discounted price).

88599c19-ab26-4cf8-8a0d-eda323556832 (1).jpg



HZSound Waist Drum.jpg

Graph of the Waist Drum via IEC711 compliant coupler.


Just did a brief listening, I think the Waist Drum is U shaped, compared to the more neutral bright Heart Mirror. Definitely Waist Drum has more bass quantity, but have to do some comprehensive A/B testing to determine which has better quality.

HZSound Heart Mirror Versus Waist Drum.jpg

Graph of the Waist Drum versus Heart Mirror via IEC711 compliant coupler.

Brief impressions of the Waist Drum:

Accessories are superbly generous:
369eeb36-746b-4d64-bf92-3a5c6e864bd8.jpg

Comes with spare filters, cable, 3 types of tips (inclusive of some sony hybrid lookalike), anime waifuu card, cloth bag. Puts to shame some of higher end IEMs in the accessories department (looking at you TRN cough cough).

56414fdb-4354-4e1a-afa8-98ac07297552.jpg



Build is good, very solid and light, extremely comfortable. Plus it has 2 pin connectors, which is very rare for a bullet shaped design. Meant to be worn cable down.

4ddef23e-bc91-46f5-98e5-038a741ab7f5.jpg


It is semi open back, but surprisingly isolation is about average. Not as badly isolating as some other open backed stuff like the Final E3000 though, but don't be expecting unvented BA type isolation levels.

As for amplification, the Waist Drum can be driven from lower powered sources, but it scales with juice.

Anyway, on to sound, the Waist Drum is U shaped as discussed. Note weight is on the thinner side, though not as thin as the Heart Mirror. Transients are fast. Clarity is excellent. Soundstage height is good, though depth/width are about average. Instrument separation and imaging are good at this price. Instrumental timbre is excellent, though vocals an sound a bit nasal at times.

Bass is mostly mid-bass focused, with some sub-bass roll-off. The bass is north of neutral. Bass quality is moderately fast, with slight mid-bass bleed. Texturing of bass is above average, but lacks some definition when compared to the Heart Mirror.

For the midrange, the upper mids have a pinna gain of around 12 dB or so. In essence, vocals are forwards, and may occasionally veer into shouty territory, if used at higher volumes (Fletcher Munson curve). At lower volumes/moderate volumes, this is not much of an issue, and it is a fine line that the Waist Drum balances.

Treble is boosted with good clarity and details, with surprisingly minimal sibilance. Extension is moderate, not the most airy or sparkly set.

I haven't done in depth comparison with the Heart Mirror, but the Waist Drum is more musical and less sterile/analytical. It is no slouch in the technicalities department and instrumental timbre is organic. I quite like the Waist Drum on first impressions, perhaps only the upper midrange may be an issue for those sensitive to this area, will do some detailed testing and report back!
 
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May 2, 2022 at 9:43 PM Post #62,541 of 150,849
Interesting new Intime eartips seeming to try to give back some of the effect of our outer ear parts that we lose when using in-ears ...
1651541993048.png

1651542019710.png

1651541974820.png

"Earpieces developed by utilizing the vibration analysis and acoustic analysis technologies cultivated in the development of earphones that use the company's original laminated ceramic tweeter. By adopting a unique reflective soundproof structure that superimposes the sound that comes directly into the ear and the reflected sound that is slightly delayed, the sound stage is wide and has a high sense of presence, which is in high demand.

In this structure, by providing a new reflection space inside the earpiece, some sound flows into the internal reflection space, is reflected and emitted to the outside, and intentionally produces an effective delayed sound. It is said that this slight delay makes the human ear feel more three-dimensional. In addition, the effect of this structure is not limited to the company's earphones, but it is said to be effective when attached to earphones made by other companies."
 
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May 2, 2022 at 10:07 PM Post #62,542 of 150,849
Interesting Intime eartips seeming to try to give back some of the effect of our outer ear parts that we lose when using in-ears ...
1651541993048.png
1651542019710.png
1651541974820.png
"Earpieces developed by utilizing the vibration analysis and acoustic analysis technologies cultivated in the development of earphones that use the company's original laminated ceramic tweeter. By adopting a unique reflective soundproof structure that superimposes the sound that comes directly into the ear and the reflected sound that is slightly delayed, the sound stage is wide and has a high sense of presence, which is in high demand.

In this structure, by providing a new reflection space inside the earpiece, some sound flows into the internal reflection space, is reflected and emitted to the outside, and intentionally produces an effective delayed sound. It is said that this slight delay makes the human ear feel more three-dimensional. In addition, the effect of this structure is not limited to the company's earphones, but it is said to be effective when attached to earphones made by other companies."

Are these going for an analogue reverb effect?

Japanese Translation of text in image (if anyone is wondering)

Sound invades the earpiece
Direct sound is emitted to the outside and part of it flows into the reflective space.
Reflected sound is emitted to the outside
Reflected sound flows
Sound hits the bottom of the reflective space
 
May 2, 2022 at 10:16 PM Post #62,543 of 150,849
Are these going for an analogue reverb effect?

Japanese Translation of text in image (if anyone is wondering)

Sound invades the earpiece
Direct sound is emitted to the outside and part of it flows into the reflective space.
Reflected sound is emitted to the outside
Reflected sound flows
Sound hits the bottom of the reflective space
Thanks.
In order of arrows(?):
Sound invades the earpiece
Direct sound is emitted to the outside and part of it flows into the reflective space.
Sound hits the bottom of the reflective space
Reflected sound flows
Reflected sound is emitted to the outside
 
May 2, 2022 at 11:02 PM Post #62,544 of 150,849
Interesting new Intime eartips seeming to try to give back some of the effect of our outer ear parts that we lose when using in-ears ...
1651541993048.png
1651542019710.png
1651541974820.png
"Earpieces developed by utilizing the vibration analysis and acoustic analysis technologies cultivated in the development of earphones that use the company's original laminated ceramic tweeter. By adopting a unique reflective soundproof structure that superimposes the sound that comes directly into the ear and the reflected sound that is slightly delayed, the sound stage is wide and has a high sense of presence, which is in high demand.

In this structure, by providing a new reflection space inside the earpiece, some sound flows into the internal reflection space, is reflected and emitted to the outside, and intentionally produces an effective delayed sound. It is said that this slight delay makes the human ear feel more three-dimensional. In addition, the effect of this structure is not limited to the company's earphones, but it is said to be effective when attached to earphones made by other companies."
Where can we get these to try?
 
May 2, 2022 at 11:17 PM Post #62,545 of 150,849
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May 3, 2022 at 1:16 AM Post #62,547 of 150,849
May 3, 2022 at 10:27 AM Post #62,549 of 150,849
Just received the HZSound Waist Drum I bought on Amazon two days ago (bought from KeepHIFI shop at a discounted price).





Graph of the Waist Drum via IEC711 compliant coupler.


Just did a brief listening, I think the Waist Drum is U shaped, compared to the more neutral bright Heart Mirror. Definitely Waist Drum has more bass quantity, but have to do some comprehensive A/B testing to determine which has better quality.


Graph of the Waist Drum versus Heart Mirror via IEC711 compliant coupler.

Brief impressions of the Waist Drum:

Accessories are superbly generous:

Comes with spare filters, cable, 3 types of tips (inclusive of some sony hybrid lookalike), anime waifuu card, cloth bag. Puts to shame some of higher end IEMs in the accessories department (looking at you TRN cough cough).




Build is good, very solid and light, extremely comfortable. Plus it has 2 pin connectors, which is very rare for a bullet shaped design. Meant to be worn cable down.



It is semi open back, but surprisingly isolation is about average. Not as badly isolating as some other open backed stuff like the Final E3000 though, but don't be expecting unvented BA type isolation levels.

As for amplification, the Waist Drum can be driven from lower powered sources, but it scales with juice.

Anyway, on to sound, the Waist Drum is U shaped as discussed. Note weight is on the thinner side, though not as thin as the Heart Mirror. Transients are fast. Clarity is excellent. Soundstage height is good, though depth/width are about average. Instrument separation and imaging are good at this price. Instrumental timbre is excellent, though vocals an sound a bit nasal at times.

Bass is mostly mid-bass focused, with some sub-bass roll-off. The bass is north of neutral. Bass quality is moderately fast, with slight mid-bass bleed. Texturing of bass is above average, but lacks some definition when compared to the Heart Mirror.

For the midrange, the upper mids have a pinna gain of around 12 dB or so. In essence, vocals are forwards, and may occasionally veer into shouty territory, if used at higher volumes (Fletcher Munson curve). At lower volumes/moderate volumes, this is not much of an issue, and it is a fine line that the Waist Drum balances.

Treble is boosted with good clarity and details, with surprisingly minimal sibilance. Extension is moderate, not the most airy or sparkly set.

I haven't done in depth comparison with the Heart Mirror, but the Waist Drum is more musical and less sterile/analytical. It is no slouch in the technicalities department and instrumental timbre is organic. I quite like the Waist Drum on first impressions, perhaps only the upper midrange may be an issue for those sensitive to this area, will do some detailed testing and report back!
Talk about a nice timing! Do you have the Xduoo Link2 Bal to pair it with? very very good.

Listening to this with the HZ WD right now. I love how the percussion are super snappy, crisp, fast and precise and how the voice is quite dense not thin for female (didnt try male vocal), bassis just a little bit warm boomy, as if thump is softed in edge but still fast and weighty, mids and treble are star of the show here:



PS: if you can share your impressions on my other chifi thread, it would be appreciate since these are legit good IEM that need to be share!
 
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May 3, 2022 at 11:08 AM Post #62,550 of 150,849
Talk about a nice timing! Do you have the Xduoo Link2 Bal to pair it with? very very good.

Listening to this with the HZ WD right now. I love how the percussion are super snappy, crisp, fast and precise and how the voice is quite dense not thin for female (didnt try male vocal), bassis just a little bit warm boomy, as if thump is softed in edge but still fast and weighty, mids and treble are star of the show here:



PS: if you can share your impressions on my other chifi thread, it would be appreciate since these are legit good IEM that need to be share!

how is WaistDrum compared to the current hype, Moondrop Chu?
I know Chu is cheaper, but still.
 

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