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iBasso PB-2 Pelican fully balanced portable, DB-2 Dac . . HiFlight recommended op amps page 16. . - Page 67

post #991 of 1128
Quote:
Originally Posted by Mooses9 View Post

hmmm i might have to give that a go. i have tried i would say a decent ammount of  opamps and buffers....and came to the conclusion that the lme49990 is bar none IMO, and the ha5002 the best buffer offering great current gain.....with the gain setting on high and that combo, you have a seriously powerful amp.

Im getting one of these new in the next week or so. Ill most likly b usung dummy buffers as i have a bwlnced D2k that doesnt nrrd much powet

which dummy buffers r most transparent n where do i get a quad of lme49990s ... and do i need n adapter :3
post #992 of 1128
Thread Starter 
Quote:
Originally Posted by Mshenay View Post


Im getting one of these new in the next week or so. Ill most likly b usung dummy buffers as i have a bwlnced D2k that doesnt nrrd much powet

which dummy buffers r most transparent n where do i get a quad of lme49990s ... and do i need n adapter :3

A dummy buffer is just a bypass to the socket so all you have is a wire going from one point to another. There are no chip in place. 

post #993 of 1128
Quote:
Originally Posted by Mshenay View Post


Im getting one of these new in the next week or so. Ill most likly b usung dummy buffers as i have a bwlnced D2k that doesnt nrrd much powet

which dummy buffers r most transparent n where do i get a quad of lme49990s ... and do i need n adapter :3

 

You can buy two (2) of these (one for each channel) from the ebay seller named "frugalphile" - I've done business with him several times and have always been very impressed by his soldering skills and his business practice.

 

http://www.ebay.com/itm/DUAL-SOIC-LME49990-DIP8-ADAPTER-/190999739495?pt=US_Amplifier_Parts_Components&hash=item2c7878bc67

 

They include the DIP8 adapters (again, nicely soldered.) 

 

IF you would prefer a quad of singles (instead of two duals), you can order two (2) of these from the same seller, instead:

 

http://www.ebay.com/itm/2pcs-LME49990-DIP8-ADAPTERS-/190897296160?pt=US_Amplifier_Parts_Components&hash=item2c725d9320

 

Mike


Edited by zilch0md - 1/14/14 at 7:48am
post #994 of 1128
Quote:
Originally Posted by jamato8 View Post
 

A dummy buffer is just a bypass to the socket so all you have is a wire going from one point to another. There are no chip in place. 

 

 

Quote:
Originally Posted by zilch0md View Post
 

 

You can buy two (2) of these (one for each channel) from the ebay seller named "frugalphile" - I've done business with him several times and have always been very impressed by his soldering skills and his business practice.

 

http://www.ebay.com/itm/DUAL-SOIC-LME49990-DIP8-ADAPTER-/190999739495?pt=US_Amplifier_Parts_Components&hash=item2c7878bc67

 

They include the DIP8 adapters (again, nicely soldered.) 

 

IF you would prefer a quad of singles (instead of two duals), you can order two (2) of these from the same seller, instead:

 

http://www.ebay.com/itm/2pcs-LME49990-DIP8-ADAPTERS-/190897296160?pt=US_Amplifier_Parts_Components&hash=item2c725d9320

 

Mike

so for a low gian balanced set up, it would be best to get maybe a quad of those LME 49990 adapters and install the dummy buffers, and ofc have the gain set to low 

 

what are the variable gain settings, I'd like to keep it at... at most 3 for balanced out, My w1000x is sensitive :x

 

hoping in the next week to maybe find a used Pb2, and not have to buy new, but I can afford new if need be plus I've got a pb1 so I have the adapter, already so what $325 + $35 for the 4 opamps + shipping would be around $400 or so for a new amp, not bad $100 less than an RSA F-35 and  I don't need another adapter 


Edited by Mshenay - 1/14/14 at 7:53am
post #995 of 1128

My opinion:  

 

Always select the lowest gain that allows sufficient volume with your headphones - even if you have to turn the knob well past 12 o'clock.

 

This does two things for you:  It gives you the lowest noise floor during silent portions of your music -and- it gives you more finesse to fine tune the volume than you would have at a higher gain setting, where the volume control has to stay closer to the zero position.

 

The iBasso PB2 has four sets of jumpers, each with three possible postions - Hi / Med / Low gain.  See the manual for a diagram of how to set the jumpers (on Low, to start with).  Again, if that gives you sufficient volume, you're done - leave it on Low gain.

 

Mike

post #996 of 1128
Quote:
Originally Posted by zilch0md View Post
 

 

You can buy two (2) of these (one for each channel) from the ebay seller named "frugalphile" - I've done business with him several times and have always been very impressed by his soldering skills and his business practice.

 

http://www.ebay.com/itm/DUAL-SOIC-LME49990-DIP8-ADAPTER-/190999739495?pt=US_Amplifier_Parts_Components&hash=item2c7878bc67

 

They include the DIP8 adapters (again, nicely soldered.) 

 

IF you would prefer a quad of singles (instead of two duals), you can order two (2) of these from the same seller, instead:

 

http://www.ebay.com/itm/2pcs-LME49990-DIP8-ADAPTERS-/190897296160?pt=US_Amplifier_Parts_Components&hash=item2c725d9320

 

Mike

I'm going to quote it as often as I can so I don't forget it [or email to my self herp derp] 

Quote:
Originally Posted by zilch0md View Post
 

My opinion:  

 

Always select the lowest gain that allows sufficient volume with your headphones - even if you have to turn the knob well past 12 o'clock.

 

This does two things for you:  It gives you the lowest noise floor during silent portions of your music -and- it gives you more finesse to fine tune the volume than you would have at a higher gain setting, where the volume control has to stay closer to the zero position.

 

The iBasso PB2 has four sets of jumpers, each with three possible postions - Hi / Med / Low gain.  See the manual for a diagram of how to set the jumpers (on Low, to start with).  Again, if that gives you sufficient volume, you're done - leave it on Low gain.

 

Mike

Yea I want LOW Gain, my pb1 is set to high gain ... permantly due to the smashed Gain Pins on the bottom [my fault / crappy build quality] so... well I paid $60 for it and it's my HIGH GAIN OH YEA amp, it works nicely with the DT 880 600 ohm, noise is low and I do NOT like loud volume but some ppl do, had a guy MAX out my pb1 yesterday [in balanced out] he was... happy

 

non the less I want LOW LOW LOW gain for my Dynamics, the 32 ohms ones. I've got my wanted add posted, so let's see what happens

 

thank you for the link to the opAmps as well. 

post #997 of 1128
Quote:
Originally Posted by Mshenay View Post


Im getting one of these new in the next week or so. Ill most likly b usung dummy buffers as i have a bwlnced D2k that doesnt nrrd much powet

which dummy buffers r most transparent n where do i get a quad of lme49990s ... and do i need n adapter :3

Check out HIFLIGHT on here he makes great kits for the pb2.

post #998 of 1128

I don't think Ron (HiFlight) offers LME4990s currently, or I would have mentioned him.  Ron is certainly a great guy to deal with and has bent over backwards for me a couple of times, helping me with problems.  

 

In fact, Mshenay might want to send Ron a PM with photos of his damaged gain jumpers, to see if Ron might be willing to give a quote for fixing them.  He's in Florida - not China.  :-)

 

Mike

post #999 of 1128
Quote:
Originally Posted by zilch0md View Post
 

I don't think Ron (HiFlight) offers LME4990s currently, or I would have mentioned him.  Ron is certainly a great guy to deal with and has bent over backwards for me a couple of times, helping me with problems.  

 

In fact, Mshenay might want to send Ron a PM with photos of his damaged gain jumpers, to see if Ron might be willing to give a quote for fixing them.  He's in Florida - not China.  :-)

 

Mike

Nah It's time to upgrade my amp truth be told :3. I wanted the pb2 but I settled for the Pb1, so I'd like to try the LME 49990 Pb2 as my upgrade for this Spring 

 

but a good idea thank ya :D 

post #1000 of 1128
I asked somebody whether he could make a balanced cable for me to my Sennheiser 600HD and he made the following comments.

The trouble is this is not a true balance system as Sennheiser has only 2 terminal per channel - ground and positive.

A balnced cable needs - Ground - Positive - Negative - wired the same at both ends whhich is why it is called balanced.

http://www.scotaudio.com/wiring.htm

The iBasso link shows a connector that is XLR (ground and positive for each channel) which is essntially the same as the one I made for you except I used a mini jack connector rather than XLR.

I can make one of these up for you but do be aware it is not really a balanced cable.

Does this matter?
post #1001 of 1128
I'd say it doesn't matter, given that I can't think of a single headphone that has three wires going to each transducer!

I'm sure that fellow is right so far as how to wire 3-pin XLR connectors between a balanced DAC and a fully balanced amp, for example, but eventually, you've got to get down to only two conductors per channel - for headphones or speakers. So, for most people, it's OK to call a four-wire headphone cable "balanced," while a 3-conductor headphone cable is called "single-ended" (or "unbalanced").

Try http://toxic-cables.co.uk - he won't get tripped up in semantics. :-)







Mike
Edited by zilch0md - 1/14/14 at 8:01pm
post #1002 of 1128
Quote:
Originally Posted by zilch0md View Post

I'd say it doesn't matter, given that I can't think of a single headphone that has three wires going to each transducer!

I'm sure that fellow is right so far as how to wire 3-pin XLR connectors between a balanced DAC and a fully balanced amp, for example, but eventually, you've got to get down to only two conductors per channel - for headphones or speakers. So, for most people, it's OK to call a four-wire headphone cable "balanced," while a 3-conductor headphone cable is called "single-ended" (or "unbalanced").

Try http://toxic-cables.co.uk - he won't get tripped up in semantics. :-)







Mike

Ugh yea dude Frank know's his stuff also... is that an LCD being driven by the PB2 :O... me gusta

 

Honestly some one needs to mod a pb2 to have adjustable gain on the Fly like the PB1 did, it's a shame you have to open it to adjust gain :/ 

 

still I also want a white one my self :D 

post #1003 of 1128

i use the pb2 with +10 gain and have pitch black imaging and silent floor...but it could be the use of balanced mode and using the db2 boomslang, i use a decent ammount of iems on this setup.

post #1004 of 1128
Thread Starter 

I think the PB2 and DB2 are one of the most overlooked combos or even individual pieces of electronics in the high end portable market. People just don't realize until they use them how good they are and frankly, at a bargain price for what you are getting. 

post #1005 of 1128
Quote:
Originally Posted by Mooses9 View Post
 

i use the pb2 with +10 gain and have pitch black imaging and silent floor...but it could be the use of balanced mode and using the db2 boomslang, i use a decent ammount of iems on this setup.

Nice, the hm801 may not be as quiet as the DB2, how ever my pb1 isn't noisy, it just lacks any Volume control. There's way to much gain to be able to adjust the volume suitably, and I have a lot of classical and EDM so... :/ 

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Head-Fi.org › Forums › Equipment Forums › Portable Headphone Amps › iBasso PB-2 Pelican fully balanced portable, DB-2 Dac . . HiFlight recommended op amps page 16. .