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| Portable Headphone Amps Discussion of portable headphone amps. |

07-24-2008, 04:44 PM
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Junior Head-Fi'er
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Join Date: Jun 2008
Location: Tokyo,Japan
Posts: 7
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iBasso OEM Project
My friend received the following proposals from ibasso.
>I think different communities have different needs.
>When many head-fier from Head-fi are suggesting us to remove the >charging circuit from the P series
>and use AAA batteries, you guys are suggesting us to put it back.
>When other people want the P3 to be smaller, you guys want it to be >bigger.
>It is very difficult to us. I dont think we are going to change the design at >this time.
>As a solution, we can accept your OEM project.
>If you can collect more than 50 orders, we will make the amp follow your >instructions,
>also it can under your own brand name or community name.
>The price is cheaper if the order quantity is larger.
>The sound quality of your amp should be competitive to any home unit,
>since large space is allowed and higher voltage is applied.
>It is pretty interest.
His demand is as follows.
Requirements;
> Its circuit is based on P2's. (4ch amps)
> 3 BUF634 buffers. (with WB-mode switch in L/R)
> Powered by two 006P rechargeable cells. (+9V/-9V)
> Enclosure must be D1's. (to load 16mm caps and store 2 006Ps)
> Price is under $250 without opamps.
Is there a person who wants to participate in this project?
I'm sorry by poor English.
UPDATE 09-11-2009
information of fi.Quest Portable amp
important
100PCE of 1st batch has already DONE the reservation completion.
2nd batch is NOT an appointment system. It becomes a form sold little by little every day.
It is from roughly a day 10 pieces to 20 pieces.
2nd batch Specification
"Standard" same as 1st batch Pre-bid price $349
OPAMP AD712JN
BUF 3 BUF634P in L, R, GNDch.
Caps:
2 Silmic2 47uF/25V (C3&C4),
2 MUSE-KZ 47uF/25V (C5&C6),
2 MUSE-FG 3300uF/16V (C1&C2).
"Clearer"ver. Pre-bid price $399
OPAMP 2 AD797ANZ
BUF 2 BUF634P in L, R.
BUF 2 BUF634U in L, R.
Caps:
2 Silmic2 47uF/25V (C3&C4), 2 MUSE-KZ 47uF/25V (C5&C6),
2 MUSE-ES 47uF/16V (CP1&CP2), 2 Toshin UTSJ 220uF/16V (CP3&CP4),
2 MUSE-FW 10000uF/16V (C1&C2).
"Maxxed"ver. Pre-bid price $449
OPAMP 2 OPA637AP
BUF 4 BUF634P in L, R.
BUF 4 BUF634U in L, R.
Caps:
2 Sanyo OSーCON 100uF/16V (C3&C4),2 MUSE-KZ 47uF/25V (C5&C6),
2 MUSE-KZ 33uF/25V (CP1&CP2), 2 MUSE-ES 47uF/16V (CP3&CP4),
2 Toshin UTSJ 10000uF/16V (C1&C2).
"FX Limited edition" Pre-bid price $459 (ONLY 50sets)
OPAMP 2 AD797ANZ
BUF 4 BUF634P in L, R.
BUF 4 BUF634U in L, R.
Caps:
2 Silmic2 47uF/25V (C3&C4), 2 MUSE-KZ 47uF/25V (C5&C6),
2 MUSE-ES 47uF/16V (CP1&CP2), 2 Toshin UTSJ 220uF/16V (CP3&CP4),
2 MUSE-FX 6800uF/16V (C1&C2).
"BG-Maxxed"ver.
BG-Maxxed is "Maxxed" with Black-Gate capacitor.
If you want BG-Maxxed, the following capacitor is necessary.
4 BG N 33uF/16V
2 BG STD 47uF/16V
2 BG FK 47uF/16V
You must buy these somewhere. (e.g. Parts connection)Afterwards, please buy "Maxxed",
and send us the BG capacitor.
We remodel it to BG-Maxxed. The remodeling cost is undecided.
The mailing address of the capacitor is a schedule for the announcement later...
s
UPDATE 13-11-2009
1st batch of fi.Quest will available on December 11.
infomation of BG-Maxxed modification service
For 1st batch user
When we modified 1st batch to BG-Maxxed, extra charge is $125.
(Not incl. S&H)
First of all, please buy BG-capacitor if you want "BG-Maxxed"
Next, please send us BG-capacitor and the modification charge.
The content of the modification service charge is as follows.
Maxxed-BG tune needs more
2 BUF634P
4 BUF634U
2 UTSJ 10000uF/16V
+ modification charge
(NOT incl.S&H)
For 2nd batch user
Undecided information
Maxxed to BG-Maxxed modification service charge is free.
If you want BG-Maxxed, you have to buy Black-Gate capacitor and "BG-Maxxed ready model "
(The capacitor is not mounted,other specification is same Maxxed.)
"BG-Maxxed ready model " pre-bid price is $429 (NOT incl. S&H)
1,Buy Black-Gate capacitors yourself.
2,Buy "BG-Maxxed ready model " with $429
3,Send Blac-Gate caps to us.
4,We send "BG-Maxxed" to you !
capacitor infomation:
http://www.head-fi.org/forums/5723404-post176.html
__________________
http://jp.bt-fi.com/
info@bt-fi.com
Source Sony X-1060 iPod 5.5G Classic Nano 4th Teclast T51 iPhone3GS
Amp iBasso P2 mod,T1,T2,T4mod,D4,Portaphile v2^2,Headstage USB total
Headphone/IEM
UE7,FreQShow,Fidelity Triples,Duals,Sleek CT6,Custom Shell 10pro,Suyama668(6way8driver),435(4way5driver),335( 3way5driver),Null Audio 10pro mod,Null Audio Original Quad(4)driver prototype and more..
Last edited by bt-fi; 11-12-2009 at 05:02 PM.
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07-24-2008, 07:48 PM
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1000+ Head-Fi'er
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Join Date: Aug 2005
Location: Florida
Posts: 1,107
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Wow, this is an interesting and awesome idea if 50 people can decide on a feature set. iBasso is willing to build to spec. Very cool.
__________________
Current Gear:
Music+Ears
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07-24-2008, 08:29 PM
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Junior Head-Fi'er
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Join Date: Sep 2007
Posts: 29
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Head-Fi community spec'ed dream amp?
Yes, please!
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07-25-2008, 05:49 PM
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Junior Head-Fi'er
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Join Date: Jun 2008
Location: Tokyo,Japan
Posts: 7
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New information entered from iBasso. It is as follows.
In my opinion, there are two solutions to sell:
First one. you collect the payment on Japan
and send it to us via western union or bank transfer.
Second one, we make a sale page one our site, and you guys can pay for
it as ordering a product from our site.
The first method is 8% cheaper than the second method.
We just want to give you a overview of the priceing,
if unit price for 50 unit order is 240USD,
the unit price for 100 unit order can be 200USD.
The price is going down if the order quantity is larger.
We can start your project on Sept.
So, please collect the member opinion and finalize your design before sept.
My friend thinks that he wants to adopt the second method.
The feasibility has come out in sales of amp that exceeds SM4.
__________________
http://jp.bt-fi.com/
info@bt-fi.com
Source Sony X-1060 iPod 5.5G Classic Nano 4th Teclast T51 iPhone3GS
Amp iBasso P2 mod,T1,T2,T4mod,D4,Portaphile v2^2,Headstage USB total
Headphone/IEM
UE7,FreQShow,Fidelity Triples,Duals,Sleek CT6,Custom Shell 10pro,Suyama668(6way8driver),435(4way5driver),335( 3way5driver),Null Audio 10pro mod,Null Audio Original Quad(4)driver prototype and more..
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07-25-2008, 06:09 PM
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100+ Head-Fi'er
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Join Date: Jun 2008
Location: Tokyo
Posts: 147
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Quote:
Originally Posted by bt-fi
> Price is under $250 without opamps.
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"without opamps" means that user MUST put in opamps by himself?
If so, it's interesting, new style.
Last edited by isao2k8; 07-26-2008 at 03:16 AM.
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07-25-2008, 11:34 PM
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Headphoneus Supremus
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Join Date: Aug 2005
Location: Melbourne, Australia or a racetrack near you
Posts: 4,439
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If this could dip below 200 then I'm interested.
__________________
Cans/IEM:PL30, PL50, WM2, Westone 3, UE TF10pro, KSC75, iGrado, Ultrasone Proline 900, Stax SR-404
Portable Amplifiers:Home-made CMOYs, PD XM5, FiiO E3/E5 (Proto + Final)
Home Amplifiers: Whiplash Audio Pimeta, Zero DAC
Source: iRiver H332, FiiO S3, 8GB Clip, 4GB Fuze, 16GB Cowon D2, 4G 16GB Nano, 80GB 5.5G Video
Feedback: Head-Fi eBay
WTB: Entry-level Stax amplifier, Cheap Sansa Fuze LOD (V2)
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07-26-2008, 12:34 AM
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1000+ Head-Fi'er
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Join Date: Nov 2007
Location: C @ L 1 F 0 R N 1 @
Posts: 1,365
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this sounds really cool. what if we could get all of "HEAD FI " involved. and name it the head-fier
__________________
--------------------------
Current Headphone Setup: Cowon D2 16gb + 8gb SDHC > JH5-Pro
Current Speaker Setup: Audioengine A5 Speakers > Netbook/Laptop/Desktop
[Previous Headphones] Shure E2c, Beyerdynamic DT770, Futuresonics Atrio M8, Livewires, UltrasoneProline 750, UE Triple Fi 10
[Previous Amps] iBasso D2 Viper, MisterX Mini^3
--------------------------
Feedback: Elluzion
Contact: PM or 3lluzion@gmail.com
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07-26-2008, 01:36 AM
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Headphoneus Supremus
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Join Date: Aug 2005
Location: Melbourne, Australia or a racetrack near you
Posts: 4,439
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If we get most people into this, than we can definitely drop the price down so newer head-fiers can have an affordable, great sounding amplifier!
Hey, affordable, great sounding amp with our name on it? I'm in!
__________________
Cans/IEM:PL30, PL50, WM2, Westone 3, UE TF10pro, KSC75, iGrado, Ultrasone Proline 900, Stax SR-404
Portable Amplifiers:Home-made CMOYs, PD XM5, FiiO E3/E5 (Proto + Final)
Home Amplifiers: Whiplash Audio Pimeta, Zero DAC
Source: iRiver H332, FiiO S3, 8GB Clip, 4GB Fuze, 16GB Cowon D2, 4G 16GB Nano, 80GB 5.5G Video
Feedback: Head-Fi eBay
WTB: Entry-level Stax amplifier, Cheap Sansa Fuze LOD (V2)
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07-26-2008, 10:35 AM
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Junior Head-Fi'er
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Join Date: Jul 2008
Posts: 4
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It's very interesting!
I want to participate.
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07-26-2008, 11:06 AM
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1000+ Head-Fi'er
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Join Date: Aug 2004
Location: California
Posts: 1,385
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Once the shcematics/configuration are agreed upon, is a beta model going to be supplied to a trusted impressionist for evaluation?
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07-26-2008, 04:56 PM
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100+ Head-Fi'er
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Join Date: Aug 2007
Posts: 199
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No offense to bt-fi but has anyone else had direct contact with ibasso? This guy has 4 posts and no feedback.
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07-26-2008, 05:04 PM
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Head-Fi'er
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Join Date: Jul 2008
Location: Chiba, Japan
Posts: 89
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Greeting
Hello Head-fiers
I'm the originator of this project from Japan.
Our community in Japan are modding our own PHPAs, and improve it like below images.
http://photo4.avi.jp/photo/7/396928/...-131110-pc.jpg
http://photo4.avi.jp/photo/7/396928/...-139183-pc.jpg
We often fed our opinion back to iBasso (especially about P2).
But information about new P3's spec couldn't fulfill our requirement due to reason on top.
Chargeability is most fundamental requirement for our environment.
So, I suggested them our ideal PHPA to modify.
Its codename is "P3C Orion" project.
Additionally, naming & designing rights are belonging to us.
"C" represents consumption same as "Hi-C", and its name is conscious about RSA's line-up(irony?  ).
It aims at or exceeds SM4, SR-71's quality.
Priority we think is Quality >> Price > Portability.
We want higher voltage, higher performance, chargeable, and modifiable.
Join our project, please!!
We'll welcome you
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07-26-2008, 05:10 PM
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500+ Head-Fi'er
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Join Date: Jul 2007
Location: Mass
Posts: 885
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this is very interesting project, i hope we can get lots of interest and keep this below $200, then i will probably get in on this.
__________________
Marantz CD67-SE, Lenovo Z60 > Zhaolu D2.5C > Sennheiser HD580, Denon D1001K, Audioengine A5
Feedback
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07-26-2008, 05:17 PM
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100+ Head-Fi'er
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Join Date: Nov 2004
Posts: 308
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Will consider when impressions are made, if the price is 200 or less, and if the sound is good of course.
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07-26-2008, 08:03 PM
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Headphoneus Supremus
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Join Date: Nov 2004
Location: Santa Rosa, CA --image Katmandu, Nepal Summer 2006 *We are but a cosmic blink or was that wink?*
Posts: 7,601
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So the size of the D1 for portability and a sound to compete with good home units? Implementation. I still think that a discrete output would be the way to go as the 634 has its own signature. It isn't always about voltage swing and current.
__________________
John aka Jam and Jama
Photo gallery at: www.pbase.com/jamato8 Recent publication: Ethnobotany Research & Applications, Vol 7 (2009) Kam Guilzhouh nyim Guangxxih di Benxtux Wenchual nyim Zihyuanc dih Gonxliix: Kam Local Indigenous Knowledge and Sustainable Resource Management in Guizhou and Guangxi Provinces, China http://www.ethnobotanyjournal.org/
The one constant in life is change, so will that change?
Feel with your own heart, see with your own eyes and hear with your own ears.
JH13's > Why stay home when you can go to the concert?
Listening with: JH13 Pro, Grado HF2 #469
Digital conversion: the all new MB-1 optical dual Wolfson portable dac
Amps I am currently listening with: RSA P-51 Mustang, SR 71A, iBasso D10, Lisa III, OEM BLack Gate, Non Black Gate, iBasso P3+, iBasso T3 (new version), RSA Shadow, iBasso D4
Favorite monitors: JH13 Pro, Grado HF2, Ultrasone Ed. 9 #1010, ATH-ESW10JPN
Portable monitor ratings: 1. JH 13 Pro 2. ESW10 JPN 3. PortaPros, KSC35 (modified-a great value) *4. UM2
Source: iRiver H130,140, D303 optical out, D-EJ955, D-EJ1000, D-EJ2000, 25s, 25, D-303, D-777 and others (optical out if available)
Digital Conversion: MB-1 optical Dac, Altoid tin Monica Dac I, Altoid tin Monica II Asynchronous Reclocking Dac, iBasso D10
Headphone Amplifiers:RSA: Shadow, Predator, P-51 Mustang, SR71A, Xin: IV Micro, IV Mini, Reference, SM3B, SuperMacro V LE, SM3 V6 (IV all switches), XRTA X-1, C&C Box, iBasso: P1, P2, P3, P3+, T1, T2, T3, T4 D1, D2, D3, D4, D10 Woo 3 Modified-Siemens 6922 driver, 7236 power tube, Woo 6 with the original Pseudo dual PS -
Ear Monitors: JH13 Pro, Ultra Ed. 9, Grado HF-2/F1 #469, HD650, ATH-ESW10 JPN, Ultrasone 750, HFI780, PortaPro modified, KSC35, Equation RP-21, Westone UM2
Last edited by jamato8; 07-27-2008 at 05:09 PM.
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