Thanks for this tear down. In traditional speakers, passive radiator lowers the resonant frequency of the enclosure in the same way that a port does, and the reason speaker designers use them in speakers is for two reasons: A. because the cabinet is small and the port would end up being too long to fit in the cabinet and B. they are making a waterproof speaker and a port is not waterproof. The way you tune a passive radiator is by adding weight to the cone until you lower your resonant frequency to the desired freq (or remove weight to go up in freq), and the general rule is you need twice the passive radiator cone surface area to driver if you want to play at higher volume. I build speakers for a living. I'm not sure what Letshuoer is trying to do here that can't be accomplished with acoustically resistant fabric (that mesh you were pulling apart, often made by Saati), and vents. IEM's with DD's aren't tuned like speakers. I agree with you this is gimmicky and not necessary.
I totally F'd up the surface area using Radius instead of Diameter. My bad. Still, what I said is correct: 2x6mm DIAMETER = 56.4mm^2 surface area and 1x10mm diameter = 78.54mm^2 surface area.
As you say there is no sparkle or air, one thing hits me : the RC network at first sight seems to be the specific subwoofer crossover....but it's not. When you put this type of network (derivation) on a driver that is not isolated from the other drivers by a serie element L or C, then this network acts on ALL the drivers. And it's action is reducing the treble amplitude. BTW, if I read correctly, the resistor BY5 is 1000 Ohms, so this would be electrically perfectly useless and finally inaudible. Strange design...
Way ta go, MB...now, its a dual driver letshouer z4..lol .seens to he a trend, with chinese iems...they make a great iem, people give alot of hype too..letshuoer s12....then usually, the next iem, iznt..up ta ,snuff...nice find MB...I just bought ,the ,KZ ,DQS..really good, ,fitting,snuggly, which, is very important,!! ( How an iem fits).. outta all my iems..im.up.to 15 iems..kz dqs, is my best fitting iem, did 30 hours of burn 🔥 in...kapow..this iem kicks ass...full sounding now...
Yet so far all I've seen is hype for these lol... With no crossover, all it is doing is playing the same so may as well just have the 2... What does the passive radiator do?...
Can you test the impedance graph ? To see what frequency the passive radiator and the rear chamber was tuned? I f it can be seen at all. Thanks for the teardown , I'm very skeptical about this IEM.
Not good for metal? Not good for me 😔 Also lets say I have an OG s12 that I attempted to do your original mod with. Would it be possible to send it into you for something special? Id be cool to pay. Just curious.. not sire what to do with it now lol. Has the vents poked out, its split and the damper is out on the back of the driver.
Thanks for this tear down. In traditional speakers, passive radiator lowers the resonant frequency of the enclosure in the same way that a port does, and the reason speaker designers use them in speakers is for two reasons: A. because the cabinet is small and the port would end up being too long to fit in the cabinet and B. they are making a waterproof speaker and a port is not waterproof. The way you tune a passive radiator is by adding weight to the cone until you lower your resonant frequency to the desired freq (or remove weight to go up in freq), and the general rule is you need twice the passive radiator cone surface area to driver if you want to play at higher volume. I build speakers for a living. I'm not sure what Letshuoer is trying to do here that can't be accomplished with acoustically resistant fabric (that mesh you were pulling apart, often made by Saati), and vents. IEM's with DD's aren't tuned like speakers. I agree with you this is gimmicky and not necessary.
Excellent information Muclechumps.
Thank you again for your review and explanation of driver configuration. 😊
Thanks, Appreciated. Glad to find another reviewer with time-worthy videos .☺
I totally F'd up the surface area using Radius instead of Diameter. My bad. Still, what I said is correct: 2x6mm DIAMETER = 56.4mm^2 surface area and 1x10mm diameter = 78.54mm^2 surface area.
Came over from the BGAR video! Hope you keep up the awesome incredible work you've been doing!
Thanks! Will do!
Nice teardown and new subscriber here. Can I ask where among the three nozzle tubes is the tubing for the passive radiator is connected?
Отличная разборка, продолжайте в том же духе 👍
Nice video! Just wondering any way to improve the sparkles and airiness?
Fucking love this guy thanks brother glad your brutally honest 🙏
Really good iem for live performances, vocal tracks and jazz, it also goes well with fast rhythmic bass in psychedelic trance
Im glad you enjoy it.
Thanks for this review. You just saved me money!
Put it like this, I wouldn't want to spend my own money on this.
As you say there is no sparkle or air, one thing hits me : the RC network at first sight seems to be the specific subwoofer crossover....but it's not.
When you put this type of network (derivation) on a driver that is not isolated from the other drivers by a serie element L or C, then this network acts on ALL the drivers. And it's action is reducing the treble amplitude.
BTW, if I read correctly, the resistor BY5 is 1000 Ohms, so this would be electrically perfectly useless and finally inaudible.
Strange design...
Here from HBB. Good video earned a subscriber
Thanks for the sub!
Way ta go, MB...now, its a dual driver letshouer z4..lol .seens to he a trend, with chinese iems...they make a great iem, people give alot of hype too..letshuoer s12....then usually, the next iem, iznt..up ta ,snuff...nice find MB...I just bought ,the ,KZ ,DQS..really good, ,fitting,snuggly, which, is very important,!! ( How an iem fits).. outta all my iems..im.up.to 15 iems..kz dqs, is my best fitting iem, did 30 hours of burn 🔥 in...kapow..this iem kicks ass...full sounding now...
Yet so far all I've seen is hype for these lol... With no crossover, all it is doing is playing the same so may as well just have the 2...
What does the passive radiator do?...
I replaced it with a damper and quite honestly got within 1db of the stock bass shelf. It may change the overall sound though.
Wow. I’m glad I didn’t fall for this one. I feel for the people that do.
Yeah, Lethsuoer should stop trying to be special and be good.
Can you test the impedance graph ? To see what frequency the passive radiator and the rear chamber was tuned? I f it can be seen at all. Thanks for the teardown , I'm very skeptical about this IEM.
Hi man! Simgot ea1000 has a passive radiator too do you thing thats also useless?
Not good for metal? Not good for me 😔
Also lets say I have an OG s12 that I attempted to do your original mod with. Would it be possible to send it into you for something special? Id be cool to pay. Just curious.. not sire what to do with it now lol. Has the vents poked out, its split and the damper is out on the back of the driver.
Yes you can send it to me. Join my discord and we can chat.
@@MichaelBruceShortbus I looked for it and cant see it. Should I email for you to send me a discord link?
Sorry if I'm being difficult.
Well that was kinda odd coming from Letshuoer. At least they are trying, right ?
Good video though.
They are trying.. something for sure.
Does it sound any better with the passive driver removed?
Nope. About the sameish.. which isn't amazing. It might have added a bit of thickness to the bottom end but nothing special imo.
Meh...right...Just watched Z reviews (2nd channel) poped up same time...9.21 he said 3 ie300s in the same chase for 100 bucks...LL..Lol.
Haven't tried the ie300 but I don't like these tiny drivers much.
diameter of 6 not radius
diameter of 6 and 10 not radius of 6 and 10
YES, im an idiot and pinned my dumbness. My bad. Still the concept is true. 2x 6mm DD is less surface area than 1x 10mm DD.