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Fostex HP-P1 Portable Amplifier and DAC for iPod/iPhone (Short REVIEW and Impressions Thread) - Page 19

post #271 of 1285

Interesting. AFAIK, I thought the SE535 is infamous for having the hiss but thought a (decent) DAC/Amp would -remove- that hiss instead :-

 

http://www.head-fi.org/t/563102/shure-se-535-very-noticeable-hiss

post #272 of 1285

I'm using low gain. The hiss is at the same volume regardless of where I set the volume but I listen at about 10ish too. It's the same regardless of what filter I use. I ordered a pair of DT1350s so I'll try those out tomorrow. Will report back.

 

I don't get any hiss if I plug them directly into the iphone 4.

post #273 of 1285

 I have had equal success either w/ an external amp or using the onboard amp section of the HP P1. If I had to describe a difference I would say that HP P1 adds a bit of "warmth" to the upper bass/lower midrange, whereas if I gradually add slight amounts of volume , at a time, when using the Stepdance2 I can come up with a close match to what I hear using the P1 by itself but there seems to be slightly more distinction between the overlapping of instruments frequencies ranges. I'm guessing what I'm saying is that if you don't generally listen much to recordings that contain dynamically complex instrumentation(orchestral), you will be pretty hard pressed to hear much of a difference. If I did'nt already have the Stepdance2 , I don't believe I would have gone out of my way to add it to the mix, Having it though is like "having my cake & eating it too!" These observation were made while listening w/ Beyerdynamic DT 1350 headphones(Sorry, but you're on your on when it comes to IEMs as my ear canals don't like them) (Did I already post this? well here it is again,anyhow)

post #274 of 1285
Quote:
Originally Posted by djn04 View Post

I'm using low gain. The hiss is at the same volume regardless of where I set the volume but I listen at about 10ish too. It's the same regardless of what filter I use. I ordered a pair of DT1350s so I'll try those out tomorrow. Will report back.

 

I don't get any hiss if I plug them directly into the iphone 4.



So I plugged the DT1350s into the HP-P1 and the hiss is gone. It must have been the sensitivity of the SE535s. I also scrounged up my old pair of Etymotic ER6i and the hiss was still there albeit less than with the SE535.

post #275 of 1285


 

Quote:
Originally Posted by djn04 View Post



So I plugged the DT1350s into the HP-P1 and the hiss is gone. It must have been the sensitivity of the SE535s. I also scrounged up my old pair of Etymotic ER6i and the hiss was still there albeit less than with the SE535.


I would not be surprised to see Fostex & Beyerdynamics sharing a table togther at audio shows as synergistic as this pairing is turning out to be . A "peanutbutter & jelly" pair of portable audio couplings !

 

 

post #276 of 1285

 

Quote:
So I plugged the DT1350s into the HP-P1 and the hiss is gone. It must have been the sensitivity of the SE535s.

 

Strange. I hear no hiss with any amp I've tried with my 535s or with the 530s that I had for a number of years. Maybe Shure fixed the problem (my 535s are only a few months old) or, if it is a high frequency hiss, perhaps my hearing is not good enough to detect it as I'm over fourty.

 

post #277 of 1285

Just got my HD-25-1 ii today and this one really likes the HP-P1 amp while the DT1350 likes the ALO Continental pairing with my ears.  I almost sounds like they voiced the HP-P1 to the Sennheiser sound.  This is very good.  Now I only need my SR-71B to come in and test these out balanced.

post #278 of 1285


 

Quote:
Originally Posted by slwiser View Post

Just got my HD-25-1 ii today and this one really likes the HP-P1 amp while the DT1350 likes the ALO Continental pairing with my ears.  I almost sounds like they voiced the HP-P1 to the Sennheiser sound.  This is very good.  Now I only need my SR-71B to come in and test these out balanced.


Alright, I'll bite . What about HD 25-1 grabs your interest a bit more than the DT 1350s with the HP P1?  ( I like the 1350s better with my Stepdance2, but the P1 will give me a point of reference if I should give the Senns a listen) Thanks

 

 

post #279 of 1285
Quote:
Originally Posted by knowhatimean View Post

Alright, I'll bite . What about HD 25-1 grabs your interest a bit more than the DT 1350s with the HP P1?  ( I like the 1350s better with my Stepdance2, but the P1 will give me a point of reference if I should give the Senns a listen) Thanks

 

First impressions and subject to change; single ended;

DT1350 + ALO = Fostex HP-P1 + HD-25-1  rated A  NOTE: these can be compared directly with only changing the headphone this has not been done yet.

DT1350 + HP-P1 slightly less than either of the above, rated B+

HD-25-1 + ALO <<< any of the above, rated C

 

I like the concept of a headphone being damped properly not over-damped or under-damped, with that being said:

The HD-25-1 + ALO is simply under-damped or loose or muddy or slow on transients

The DT1350 + HP-P1 is slightly over-damped or slightly thin or light or a little to fast on transients

The DT1350 + ALO and HP-P1 + HD-25-1 seem properly damped with good attack on transients.

 

More listening to the HP-P1+HD-25-1 is recommended with further evaluation of other parameters such as air and instrument positioning later.

 

The bottom line is that equipment synergy is king.


Edited by slwiser - 2/3/12 at 3:08am
post #280 of 1285

I have a couple of questions.  I do plan on using this primarily with IEMs and need to iron out if the Fostex is what I want or if I need to look elsewhere.  Regarding those who have heard a hiss with high sensitivty phones, most of my favorites tend to be high sensitivty for some reason, would you classify the hiss as a Cowon+SE535 hiss or a ZO2.1+SE535 hiss?  In other words, do you have good hearing and can tell it is there during quiet passages or is it so horrible it reminds you of an AM radio.

 

post #281 of 1285

I forgot to mention I own SE535, FX700, IE8, Atrios, MTPG, Brainwavez B2, Klicpsch Custom 3, V-Moda M-80, and Beyer T50p and plan on getting UM Merlins and possibly Futuresonics' MG6PRO....at which point several of the universals and possibly one of the portables will get culled and offered up to the for sale section.  I also own a 600ohm Beyer 990, Grado SR325, Audio Technica M50 and might look into getting the HE-500, but again I am primarily looking at the HP-P1 for my IEMs just curious how it would work for the full size can's if anyone has tried with any of them yet(I suspect the 600ohm Beyers are out, but have no idea about the others.

 

So, HP-P1...yeah or nay?

post #282 of 1285

I read some of the earlier discussion on battery replacement and was curious to clarify that issue.  My iPhone started dropping charge-time pretty rapidly at only two years of steady use.  I'm wondering why the earlier speculation that the batteries in this unit may last much longer (at least that's what I gleaned from a brief scan of that discussion)?  Also, is Fostex offering a replacement battery at all?

post #283 of 1285

One more question about the "SPDIF digital output" - the manual says that you can connect this port to a digital recorder or an amplifier for playback.  Sorry, I don't get this - if the output is providing digital>digital as delivered via the HP-P1 SPDIF Toslink connection, then you would need the interface of a DAC before using an amplifier (which requires an analog signal, nes pas?).  Yet the literature and manual seems to indicate it could go just to an amplifier....Huh?  Can anyone explain this?  Can anyone further comment about the quality of a line-out signal or the quality of the digital out via that self-same SPDIF port?  Anyone using this to stream files from their computer to self-powered monitors to listen that way?  Does it make for a decent DAC for those purposes?

post #284 of 1285

The manual clearly has some errors. There is a Toslink digital output and an analogue line out (fixed volume) using a 3.5mm socket.

 

The battery is soldered in, but it's obviously replaceable. I have no idea how Fostex would handle such a request though. 

post #285 of 1285

Thanks, Currawong.  I commented on your review thread as well (thanks for that).  

 

My thoughts/concerns on the battery issue, and this goes for all such devices that are prone to some pretty heavy use and multiple cycles of recharging, just like my iPhone, is whether this is a case of planned obsolescence or is there some sort of reasonable provisions for their eventual need for replacement.  Devices like these, especially those with a capable amp and DAC in the same tiny chassis (HP-P1, DX-100, HM-801, Colorfly, etc)....should they be viewed as a disposable investment with a lifespan like an iPhone?  What are your thoughts?  I know HiFiMan does offer replacement batteries for the 801...but wasn't sure about others.  

 

One further question: Is the Fostex able to play FLAC from an iPhone4 via an app like FLAC Player?


Edited by jax - 2/5/12 at 10:17pm
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