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| Portable Headphone Amps Discussion of portable headphone amps. |
12-19-2007, 09:22 PM
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1000+ Head-Fi'er
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Join Date: Feb 2006
Location: Knoxville TN
Posts: 1,467
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Quote:
Originally Posted by kamal007
x2
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pics are posted all over the place in Ray's starting thread at the top of the forum's opening page.
__________________
I can't see how the human race is going to survive now that the cost of living has gone up $2 a quart--W.C. Fields
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12-19-2007, 09:23 PM
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Junior Head-Fi'er
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Join Date: Oct 2007
Posts: 19
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Quote:
Originally Posted by kamal007
x2
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X3 
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12-19-2007, 11:04 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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You guys and your picture lust. Who has a camera?
I found out the Predator has a 15,000uf cap so I can see where a long burn-in is needed. I would speculate, due to the small current flow and large cap that a burn-in of 500 hours or more is needed to realize the full potential of this amp/dac. I know that in the 2 days I have had it on, there have been changes, which is one reason it isn't really fair at this time to compare it to other burnt in amps but I do enjoy hearing the changes and reporting what I hear.
Anyone who buys one of these has to bear in mind that you will not hear what it is capable of for a few hundred hours. As dielectric changes due to the charge going through the wire, resistors change, and of course caps form due to the chemical and metallic properties they possess. There are white papers written on all these properties but I don't feel like citing them right now.
__________________
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
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12-19-2007, 11:16 PM
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Headphoneus Supremus
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Join Date: Mar 2007
Location: Nashville, TN
Posts: 2,083
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Quote:
Originally Posted by tnmike1
pics are posted all over the place in Ray's starting thread at the top of the forum's opening page.
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yeah but we want to see them from different angle, different camera etc =)
__________________
Headphones Grado SR60, Grado HHF-1
Modded Koss KSC-75, Shure E2C, Yuin PK3, Amplifiers / Source Ipod Shuffle, Ibasso D2 Viper
Gone list Darth BeyerV3,Denon AH-D2000,DT990,DT880,DT770,HD650,HD600,HD595,HD580,HD 495,HF-1,
SR60,SR125,SR225,MS2i,RS-2,DR150,ATH-W1000,ATH-ES7,ATH-AD700,PX200,AKG K701,K81DJ,K240 Sextetts,Mylarone X3,YUIN PK2
PS Audio GCHA,Apogee Mini-DAC, Meier Corda Aria, Headfive, Heed Canamp, Lunchbox II, Little Dot II++, MisterX PPA, Headamp Pico, Melos SHA-1
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12-19-2007, 11:53 PM
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1000+ Head-Fi'er
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Join Date: Oct 2006
Location: Sydney, Australia
Posts: 1,325
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Quote:
Originally Posted by jamato8
You guys and your picture lust. Who has a camera?
I found out the Predator has a 15,000uf cap so I can see where a long burn-in is needed. I would speculate, due to the small current flow and large cap that a burn-in of 500 hours or more is needed to realize the full potential of this amp/dac. I know that in the 2 days I have had it on, there have been changes, which is one reason it isn't really fair at this time to compare it to other burnt in amps but I do enjoy hearing the changes and reporting what I hear.
Anyone who buys one of these has to bear in mind that you will not hear what it is capable of for a few hundred hours. As dielectric changes due to the charge going through the wire, resistors change, and of course caps form due to the chemical and metallic properties they possess. There are white papers written on all these properties but I don't feel like citing them right now.
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Thanks for the clarification re: where it is in relation to its burn in.
I look forward to revisiting your impressions when you can report on its true potential.
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12-20-2007, 12:03 AM
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Moderator:
Headphoneus Supremus:
The first to organize an International Head-Fi Meet (2006)
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Join Date: Mar 2002
Location: "I can't hear you...I have my headphones on" Long Island, NY
Posts: 8,748
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Did you get the Predator with a chassis or get it naked?
__________________
**********************************
-My house was built for lovin'...not a theater of war.
-Realize it's harder to find your own voice, then to follow one, already in the air.
~~~><///'>~~~><///'>~~~><///'> ~~~
Music is my recreational drug...I need a dose, everyday!
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12-20-2007, 12:19 AM
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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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This has a chassis. Ray mentioned to me that the one in Florida was a new board with no real hours on it. He would have to clarify further. All that I know is that the one I have had 300 hours on it when I received it and that it has continued to change in sound character. I have read that the Predator heard at the meet lacked some detail. To be honest I wouldn't want much more, if any more, detail than what I am getting as it would start to get in the way of the music as being unnatural. With what we all listen to on headphones, in real life, I have never heard except on a rare occasion in regards to detail. I think that the whole experience be it speakers or headphones is hyper compared to real life in order to make up for the fact that it isn't live and isn't the actual event therefore we want more in order to overcome this. I have sat 10 feet from live orchestra performances and listened to solos from singers to violins and have never heard the rosin on the bow, or the sucking in of air that I have heard on recordings.
__________________
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; 12-20-2007 at 12:21 AM.
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12-20-2007, 01:23 AM
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Headphoneus Supremus
Can Jam '10 Organizer
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Join Date: Dec 2003
Location: Chicago
Posts: 6,483
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he always tweaks every amp before it makes it out to the first customer. the day i picked up the Raptor he was still tweaking. he probably listens to people opinions at the meets and goes from there...my guess.
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12-20-2007, 02:26 AM
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Moderator:
Headphoneus Supremus:
The first to organize an International Head-Fi Meet (2006)
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Join Date: Mar 2002
Location: "I can't hear you...I have my headphones on" Long Island, NY
Posts: 8,748
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My mistake. The one in Florida had very little hours and the one in NY had multi-hundred hours. They were 2 different units. Sorry for being a butt-insky. 
__________________
**********************************
-My house was built for lovin'...not a theater of war.
-Realize it's harder to find your own voice, then to follow one, already in the air.
~~~><///'>~~~><///'>~~~><///'> ~~~
Music is my recreational drug...I need a dose, everyday!
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12-20-2007, 04:06 AM
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Head-Fi'er
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Join Date: Jan 2006
Posts: 34
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Stop teasing us how does it sound!
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12-20-2007, 04:22 AM
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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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Well I have been describing that to a point. Right now it is a little bright (350 hours) but the bass impact is excellent, male and female voices (K.D. Lang, Shadow Land) are very good and do not get lost in the mix. This little thing throws a wide and fairly deep sound stage but again, it needs time to fully form/settle/break-in. What still amazes me is how far portable amps and now usb/dac/amps have come in just a couple of short years.
__________________
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
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12-20-2007, 04:35 AM
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Head-Fi'er
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Join Date: Jan 2006
Posts: 34
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Very cool, thank you!
Lots of really nice pics at your pbase link too btw! Keep shooting!
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12-20-2007, 04:55 AM
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100+ Head-Fi'er
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Join Date: Apr 2004
Location: Chicago, IL USA
Posts: 419
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I'm very excited. I can't wait to pick mine up!
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12-20-2007, 08:23 AM
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Administrator
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Join Date: Jun 2001
Location: Metro Detroit
Posts: 7,621
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Quote:
Originally Posted by jamato8
Well I have been describing that to a point. Right now it is a little bright (350 hours) but the bass impact is excellent, male and female voices (K.D. Lang, Shadow Land) are very good and do not get lost in the mix. This little thing throws a wide and fairly deep sound stage but again, it needs time to fully form/settle/break-in. What still amazes me is how far portable amps and now usb/dac/amps have come in just a couple of short years.
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I've still got the now well-used naked Predator prototype that I posted about in my blog some time ago, and a black-on-black production Predator on order. After all this time with the naked prototype, it's safe to say my sonic impressions are very similar to yours, John.
I can't wait for my production Predator to arrive, so that I can stop worrying about setting this naked prototype on anything conductive.
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12-20-2007, 01:36 PM
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100+ Head-Fi'er
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Join Date: Nov 2007
Location: PHIL
Posts: 453
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Quote:
Originally Posted by jamato8
There are white papers written on all these properties but I don't feel like citing them right now.
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Hi Jamato,
Can you PM to me the link of white papers regarding burning in period, coz somebody from the other forum is looking for this fact sheet. and I'm interested too.
Thanks a lot.
__________________
Portable Rig: Sony HD5-> UE mini to mini > RSA Hornet->UE TripleFi 10
Desktop Rig: HP DV2000-> *Stello DA100 -> *Stello HP100 ->Silver Dragon > Sennheisser HD650/Grado RS1/MS2i *Audio Plus Interconnects & Optical Cable
Home Rig: Rotel RCD-1072->RC-1070->RB-1070-> Sonus Faber Concerto Home / Velodyne SPL1000R with SMS-1
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