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post #23506 of 24765
Quote:
Originally Posted by EveTan View Post

Is it ok to just use it directly without the wallwart? I know that's what Mechgamer is doing with his 2020.

You need a wallwart adapter ps to power the basic Stax amp's. You can't run them off anything else. I haven't asked Mech lately about whether she bought a matching wallwart or using a step down trafo, but she is using either of the one. How are you going to power the 252 if you don't use an AC adaptor? tongue.gif


Edited by DefQon - 7/10/13 at 6:54pm
post #23507 of 24765
Quote:
Originally Posted by DefQon View Post

You need a wallwart adapter ps to power the basic Stax amp's. You can't run them off anything else. I haven't asked Mech lately about whether she bought a matching wallwart or using a step down trafo, but she is using either of the one. How are you going to power the 252 if you don't use an AC adaptor? tongue.gif

Haha sorry. I meant is it possible to use without  the step down.


Edited by EveTan - 7/10/13 at 7:29pm
post #23508 of 24765

Voltage converter?

post #23509 of 24765
Quote:
Originally Posted by DefQon View Post

Quote:
Originally Posted by EveTan View Post

Is it ok to just use it directly without the wallwart? I know that's what Mechgamer is doing with his 2020.

You need a wallwart adapter ps to power the basic Stax amp's. You can't run them off anything else. I haven't asked Mech lately about whether she bought a matching wallwart or using a step down trafo, but she is using either of the one. How are you going to power the 252 if you don't use an AC adaptor? tongue.gif

As per the suggestion of another member, I am in fact just using the 100v Japanese transformer that came with the Stax from Japan. The American transformer I bought makes a weird buzzing sound that I figured probably isn't good for the amp, so I quit using it and just use the transformer now.

post #23510 of 24765

Since the mains will always fluctuate between 120-124v in the States, running the 100v Stax wallwart off 120v+ mains is not a good idea.

post #23511 of 24765

If you used a "wall wart" that buzzed it is either 1 of 2 things-if analogue -mains transformer- then it is a cheaply made and bad design [lamination's vibrating]unless you have dropped it. -If it is digital-SMPS then its still a cheap make as you are hearing the switching frequency or a harmonic of it. If you value you hi-fi equipment -buy QUALITY-if you can afford it.

post #23512 of 24765
Quote:
Originally Posted by duncan1 View Post
 If you value you hi-fi equipment -buy QUALITY-if you can afford it.

Can't disagree to this.

post #23513 of 24765

Couldn't it jsut be that it isn't grounded or something?

post #23514 of 24765

spritzer wasn't lying about 404 sig's sounding bit different to each other. 

post #23515 of 24765
Hi, Stax-heads.

I'm looking for advice on custom in-ear monitors. The reason I'm posting in this thread is that I'm after something with a very analytical sound and a wide soundstage. What I really want is to get as close to the sound of a pair of full-size Staxs as possible in an CIEM. I realise I won't get all that close, but the closer the better.

They also have to have decent isolation. I mention that in case anyone's wondering why I don't go for Stax IEMs.

Maximum cost is US$700.

Looking at reviews elsewhere on head-fi, the main options at under $700 seem to be:

* Cosmic Ears BA2 - only $250, so this is my default choice - http://www.head-fi.org/t/626714/cosmic-ears-new-ciem-company-with-crazy-low-prices-including-hybrid-designs

* Fabs - http://www.head-fi.org/t/541494/multi-custom-in-ear-monitor-review-resource-mfg-list-discussion-26-reviews-um-pp6-added-3-12-13

* Heir 4.A - http://www.head-fi.org/t/620356/review-heir-audio-4-a

* Alclair Reference - http://www.head-fi.org/t/597308/alclair-reference-master-custom-iem-review

I'm hoping to get more opinions, especially since other reviews haven't tended to concentrate on analytical sound.

(Also, if anyone in Melbourne or Sydney could recommend an audiologist for taking the impressions that would be a lovely bonus.)

Thanks!

Jason
post #23516 of 24765
Lots of good audiologist in the city and east area.
post #23517 of 24765
Quote:
Originally Posted by DefQon View Post

Lots of good audiologist in the city and east area.

Great. I'm near the city.
post #23518 of 24765
Quote:
Originally Posted by DefQon View Post

Since the mains will always fluctuate between 120-124v in the States, running the 100v Stax wallwart off 120v+ mains is not a good idea.

 

It's a good way of blowing up the amp as the components are run pretty close to their limits so feed it a higher input voltage and the linear switcher will run all of it out of spec. 

 

Quote:
Originally Posted by DefQon View Post

spritzer wasn't lying about 404 sig's sounding bit different to each other. 

 

Clearly two different drivers at play here.  

post #23519 of 24765
Quote:
Originally Posted by duncan1 View Post

If you used a "wall wart" that buzzed it is either 1 of 2 things-if analogue -mains transformer- then it is a cheaply made and bad design [lamination's vibrating]unless you have dropped it. -If it is digital-SMPS then its still a cheap make as you are hearing the switching frequency or a harmonic of it. If you value you hi-fi equipment -buy QUALITY-if you can afford it.
Wanna give me a link to the one you would use then? wink.gif
It is the amp itself buzzing, not the wall wart.
Quote:
Originally Posted by tumble View Post

Hi, Stax-heads.

I'm looking for advice on custom in-ear monitors. The reason I'm posting in this thread is that I'm after something with a very analytical sound and a wide soundstage. What I really want is to get as close to the sound of a pair of full-size Staxs as possible in an CIEM. I realise I won't get all that close, but the closer the better.

They also have to have decent isolation. I mention that in case anyone's wondering why I don't go for Stax IEMs.

Maximum cost is US$700.

Looking at reviews elsewhere on head-fi, the main options at under $700 seem to be:

* Cosmic Ears BA2 - only $250, so this is my default choice - http://www.head-fi.org/t/626714/cosmic-ears-new-ciem-company-with-crazy-low-prices-including-hybrid-designs

* Fabs - http://www.head-fi.org/t/541494/multi-custom-in-ear-monitor-review-resource-mfg-list-discussion-26-reviews-um-pp6-added-3-12-13

* Heir 4.A - http://www.head-fi.org/t/620356/review-heir-audio-4-a

* Alclair Reference - http://www.head-fi.org/t/597308/alclair-reference-master-custom-iem-review

I'm hoping to get more opinions, especially since other reviews haven't tended to concentrate on analytical sound.

(Also, if anyone in Melbourne or Sydney could recommend an audiologist for taking the impressions that would be a lovely bonus.)

Thanks!

Jason
I don't have much experience with CIEMs but I just heard the 4As yesterday and they do NOT fit the bill for what you're looking for.
Quote:
Originally Posted by davidsh View Post

Couldn't it jsut be that it isn't grounded or something?
But then why would only the American transformer make the amp squeal but not the Japanese one? Neither are grounded...
post #23520 of 24765

Mechgamer you said the American transformer you bought makes a quote-"weird buzzing sound" I took that to be a wall wart?? . If you are saying its the amp that's buzzing that's a change to your original post?? Spritzer is absolutely right if you are using a 100 V Jap wall wart that s WORKING voltage is 100V and the US voltage is 124 V or more it will output a good bit over the standard voltage of a correct one. Old tube radios for export used different tapping's to accommodate different countries voltages. An "old trick" if all the tubes were of low emission was to  lower the tapping settings so that more voltage was applied to them[over voltage] NOT recommended normally] IE from say UK 240 V tapping reduced to 210V  so the regulators[if any] inside the equipment must be able to cope with that . Maybe so but what about the smoothing caps they wont live with overvoltage Also is the Japanese mains frequency -60HZ as is the US standard -the UK is 50HZ that would cause a buzzing.  ?

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