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Soundmagic HP150 impressions thread. - Page 41

post #601 of 611
Quote:
Originally Posted by DecentLevi View Post

If anyone wants to tighten up the bass / dynamics a bit on their HP 150 or 100, here's a method that I call an "external mod", that can be done without any alterations to the headphone itself. Just get 1-2 of these external resistors to stack in front of your headphones, which adds 75 ohms of impedance. Lyova & I have done extensive testing on these, and it seems to tighten up the loose / 'flabby' bass and the dynamics a bit.

https://www.amazon.com/dp/B00A2QJL0C
http://www.ebay.com/itm/272165203681

Also an external "inline volume limiter" can be used for the same effect. The difference is more subtle rather than 'day & night', and is good for either normal or modded headphone, but I would still recommend the modded version from Tru-Fi speakers (link in my signature). Especially the newest revision for his HP-150 mod - it's a sure shot winner and I liked it even about 30% better than his HP-100 mod
@DecentLevi

My perception of audio is not quite as great as yours, so I can't say I heard a 30% improvement in dynamics like you did. But, I've always been using impedance (resistor) cables with cheaper headphones that have lower resistance to make up for any channel imbalances (by decreasing the proportion of the difference in impedance to the overall impedance between the two drivers). I'm glad you were there to try that for me though since I, unfortunately, forgot to measure (while I was at the meet) the modified HP150 with and without the resistor cables to see if it made an improvement in the total harmonic distortion ratings (this distortion can be affected by the dynamics of the headphones). So I'm not sure if there is a scientific basis for all this (since I have no personal measurements) other than what I already know about audio (THD, dynamics, electrical impedance, etc.) in general and what Levi told me he heard.

The only reason I prefer resistance cables (/impedance adapters) though over analogue volume limiters, is that analogue volume limiters all tend to have a slight channel imbalance at lower volume levels.

Best Regards,
Lyova Margaryan of Tru-Fi Speakers
Edited by Packdemon - 7/23/16 at 3:18pm
post #602 of 611

Another interesting thing about this headphone are the holes around the driver. All the reviews say it is a closed can with one tiny hole....the bass port. actually there are four compartments around the driver, each compartment has five holes. I've found that covering these holes is another opportunity for modding this headphone.

 


Edited by 7keys - 7/23/16 at 6:30pm
post #603 of 611
Quote:
Originally Posted by 7keys View Post
 

Another interesting thing about this headphone are the holes around the driver. All the reviews say it is a closed can with one tiny hole....the bass port. actually there are four compartments around the driver, each compartment has five holes. I've found that covering these holes is another opportunity for modding this headphone.

 


Noticed that while I was stripping mine down. I think (speculation, of course) that's what give these phones a larger than usual SS. Back wave of the driver reflecting forward or something like that

post #604 of 611
Quote:
Originally Posted by 7keys View Post
 

Another interesting thing about this headphone are the holes around the driver. All the reviews say it is a closed can with one tiny hole....the bass port. actually there are four compartments around the driver, each compartment has five holes. I've found that covering these holes is another opportunity for modding this headphone.

 

 

Those holes are necessary for drivers to breath. It doesn't affect the sealing of the headphones too much since it is really just the air circulating between the seal from the earpads and the inside of the driver. Most dynamic drivers in closed headphones have them actually (filtered with mesh or felt though). That being said though, there are actually more holes in this headphones from which sound leaks than just the single bass port on each side (or the not so well isolated stock earpads). Air actually leaks inside (and out) from the lip where the earpads are placed, the larger open hole from the hinge port, and the smaller open hole from the hinge port that has the right channel wire/cable running through it.

 

Beyerdynamic "closed" driver:

 

Lip:

 

Bass port (that you mentioned):

 

Large hole hinge port:

 

Smaller hole hinge port:

 

 

Now after saying all that, I still think that your idea of sealing those holes on the driver's plastic diaphragm is not a bad idea at all if you can somehow manage to balance the sound afterwards. I'd actually not only like to see that done to it, but also have entire inner diaphragm plastic portion (not the driver in the middle itself though) covered in dampening material like your blue tac or some dynamat to help reduce even more of the negative phase reflections from the earcup. That could help to potentially make a dynamic driver sound closer (closer not quite there though) to a planar magnetic driver. Basically, it would solve (or lessen rather) the problem presented in this video in regards to the part about dynamic drivers:

 

 

Best Regards,

Lyova Margaryan of Tru-Fi Speakers


Edited by Packdemon - 7/23/16 at 7:42pm
post #605 of 611

I'll be using some of this on the holes, I'll start cutting a piece that will fit the whole area in each compartment.

post #606 of 611

I would recommend covering just 1-2 holes on each bank of holes, for a more balanced result rather than closing off an entire section.

 

-or- adding more holes

post #607 of 611
Quote:
Originally Posted by DecentLevi View Post
 

I would recommend covering just 1-2 holes on each bank of holes, for a more balanced result rather than closing off an entire section.

 

-or- adding more holes

I thought I'd close all the holes first, if I closed only one it might be too subtle a change for me to notice. I'd like to get a good idea of what this will do first and then I could decide on how many holes I prefer.

post #608 of 611
Quote:
Originally Posted by 7keys View Post
 

I thought I'd close all the holes first, if I closed only one it might be too subtle a change for me to notice. I'd like to get a good idea of what this will do first and then I could decide on how many holes I prefer.

Very interesting, keep us posted on the results!

post #609 of 611

Hey, the same earpads that were tested to pair the best with the HP 100 / 150 mod are on a cheap Massdrop:

https://www.massdrop.com/buy/19011

choose the DT770 premium memory foam option (leather, not velour)

 


This is the right one, although they don't show a photo for this one


Edited by DecentLevi - Yesterday at 8:52 pm
post #610 of 611
I currently own ibasso dx80 listening with audio technica 50x and creative aurvana live between both Headphones I prefer CAL but I want to upgrade headphone and my choice is soundmagic hp150
is the Sound quality is good without any amp.
how does the Soundstage of hp150 will compete with CAL in term of both width and depth
post #611 of 611
Quote:
Originally Posted by DecentLevi View Post
 

Hey, the same earpads that were tested to pair the best with the HP 100 / 150 mod are on a cheap Massdrop:

https://www.massdrop.com/buy/19011

choose the DT770 premium memory foam option (leather, not velour)

 


This is the right one, although they don't show a photo for this one

Could you point me to the thread or site where they tested pads for the HP150.

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