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Speaker amps for headphones - Page 169

post #2521 of 2631
Quote:
Originally Posted by Chris J View Post
 

 

Then I'm stumped!

I have no idea why the A1 + HE4 are misbehaving!  

 I'm just making sure it's not something I'm doing wrong. It could very well just be the amp and headphone combo isn't a good one.:confused_face_2: Weird thing is it sounds so good with the speakers and definitely warm with the Mullard.

Would a HF resistor box or similar reduce treble? Not sure the exact names but it's basically the 4-pin XLR to RCA connects they sell for $99.

post #2522 of 2631
Quote:
Originally Posted by Soundsgoodtome View Post
 

 I'm just making sure it's not something I'm doing wrong. It could very well just be the amp and headphone combo isn't a good one.:confused_face_2: Weird thing is it sounds so good with the speakers and definitely warm with the Mullard.

Would a HF resistor box or similar reduce treble? Not sure the exact names but it's basically the 4-pin XLR to RCA connects they sell for $99.

 

If it's properly designed, it shouldn't reduce the treble, mostly just the overall volume

post #2523 of 2631

Ok, well the A1+HE4 experimentation has come to an end. I was really hoping I can knock out 2 birds with one stone powering speakers and the HE4. The HP out (1wpc @32ohm) is decent enough but lacks the bottom end like the 4wpc on the Audio-GD.

Thanks for the input @Chris J and @john57


Edited by Soundsgoodtome - 3/17/14 at 5:50pm
post #2524 of 2631
May I ask you some questions. Or first explain the whole chain to me . Specs included if possible .

Al
post #2525 of 2631
Quote:
Originally Posted by ALRAINBOW View Post

May I ask you some questions. Or first explain the whole chain to me . Specs included if possible .

Al


I have my Lenovo laptop going to a Yulong D100 Dac/Amp. I run line-out from the D100 to the Tubemagic A1's line in. From there I have the HE4 to the speaker taps via balanced 4-pin XLR to an adapter that goes to bare wires to the speaker taps. Pretty straight forward.

Lenovo Laptop > USB to Yulong D100 > Line-out to Tubemagic A1 > (speaker taps) Balanced 4Pin XLR to HE4
Edit: I'm using the line-in on the front of the A1 vs 'analog in' on the back of the unit. Wonder if that makes a difference? Listed on the very bottom it says the RCA as 1000k ohms, maybe line-in on the front is different.

@john57 mentions: The amp uses a LM1876T chip for the output. If the chip is using bridged mode it is not a common ground amp at the speakers outputs. How are you connecting the headphones?



Here's some info on the D100:

Specifications:  

  • Inputs: Optical, Coaxial, USB, AES/EBU
  • Input digital signal format: 32-192 KHz, 16/24 Bit auto detection. USB supports up to 24Bit 96KHz
  • SNR: >120dB.
  • DynamicRange: 115dB.
  • THD+N: <0.0005% at 1KHZ
  • Frequency response: 20-20KHz-0.16dB.
  • Headphone output power: 130mW at 300Ohm, and 900mW at 32Ohm
  • Headphone output impedance: 16 Ohm to 600 Ohm
  • Dimensions: 10" W x 7" D x 2" H 
  • Net Weight: 1.5Kg / 3.3 lbs
  • Packing Size: 12" W x 12" D x 4"H

Included in the packaging: DAC, user manual, USB cable. Power cable

 

 

Note:  The factory warranty is void if the DAC is opened not by authorized dealer or service center.  

 

WARNING:    Both of the RCA and XLR line level outputs are NOT controlled by the Volume knob on front panel, and as always in full output level. Any equipment connected to these outputs must have a proper volume control, otherwise your headphones or speakers might be damaged. It might harm the hearing of audience too. Manufacturer is not responsible for any damages caused by improper usage. 

 

 

 

 

 

 

 

 

 

 

 

Quoted from an earlier post, here's the A1:

 

TubeMagic D1 back panel

 

 

Audio outputs:

 

  • All RCA connectors are gold-plated
  • Volume control is provided for all outputs
  • Power outputs: 20 watts per channel (into 8 ohms), 40 watts per channel (into 4 ohms)
  • Frequency Response: 20Hz – 25KHz
  • Input Impedance: 100K ohms
  • Analog RCA outputs signal-to-noise ratio: >90dB
  • Tube pre-out outputs signal-to-noise ration: >90dB
  • Total harmonic distortion: less than 0.1% (Tube pre-out outputs and analog outputs)
  • Headphone maximum output power: 1000mW x 2 (32 ohms), 500mW x 2 (300 ohms), 300mW x 2 (600 ohms)
     

Additional info on A1:
 

Maverick Audio TubeMagic A1 Hybrid Integraged Amplifier

 

Audio inputs

  • Analog audio input x 1 (Analog)
  • Line-in audio input x 1 (Analog)
  • Analog  connector: RCA, 1000k ohms

Edited by Soundsgoodtome - 3/17/14 at 6:07pm
post #2526 of 2631
Ok I have some good thoughts and something cheap to try. Of the system sounds good to you liking with speakers it should be fine with headphones .

So here is my first question , what about the headphone sound you do not like. ?
If it is dynamics thee is a good chance to fix it.
Next question volume control. From 1 to 10 . Low to loud. What setting do you use for speakers compared to headphones ?
Al
post #2527 of 2631
Quote:
Originally Posted by ALRAINBOW View Post

Ok I have some good thoughts and something cheap to try. Of the system sounds good to you liking with speakers it should be fine with headphones .

So here is my first question , what about the headphone sound you do not like. ?
If it is dynamics thee is a good chance to fix it.
Next question volume control. From 1 to 10 . Low to loud. What setting do you use for speakers compared to headphones ?
Al



I like the HE4 connected to the HP out but I feel it's missing the bottom end. Same as with the HP out on the Yulong D100. With my Audio-GD at home however, the bass is solid and adds weight to the sound. The audio-gd is running balanced and at 4W per channel.

As for the volume, going off of memory with the headphone out I was at about 1 o'clock vs on the speakers I'm about 2-3 o'clock (quite sure on speaker volume position). Volume all the way down is 7 o'clock for reference.


Edited by Soundsgoodtome - 3/17/14 at 6:27pm
post #2528 of 2631
Ok sounds like your idea is correct. , try connect them directly to the speaker terminals. The amp is not that powerful to need a resister box. And I willing to say you will be very happy as is.

Al
post #2529 of 2631
Quote:
Originally Posted by ALRAINBOW View Post

Ok sounds like your idea is correct. , try connect them directly to the speaker terminals. The amp is not that powerful to need a resister box. And I willing to say you will be very happy as is.

Al


LoL you haven't read any of the earlier posts? I've tried it already and the headphone is too bright whereas the speakers sound as they should.

post #2530 of 2631
Have you tried speaker out and only using the volume on the amp alone . Meaning turn the volume all the way up on the dac. Or line out as you say. It does sound like the amp is not outputting enough voltage and or current for the headphones. This is how the FW F3,sounded to me.

Al
post #2531 of 2631
Line out on the DAC is fixed, I'm using the amp volume alone.
post #2532 of 2631
Ok I figured , it does like the amp is either missing current or voltage to drive them well. I thought the amp was 200 at quick glance. Sorry you have tried it all already.

Al
post #2533 of 2631
Quote:
Originally Posted by ALRAINBOW View Post

Ok I figured , it does like the amp is either missing current or voltage to drive them well. I thought the amp was 200 at quick glance. Sorry you have tried it all already.

Al

It would sound clipped or compressed if you weren't getting enough power/current/voltage.

I calculate you should get approx. 2.5 Watts into a 64 Ohm headphone from the A1 speaker jacks.
Edited by Chris J - 3/18/14 at 4:17am
post #2534 of 2631

According to their web page the headphone output is pure tube, where as the speaker output consists of a tube pre amp and SS power amp circuit. Seems that you have just experienced bad synergi between the HE-4 and power amp section of the A1.

post #2535 of 2631
I agree but he does notnsaybit clipped.
Also the DNA stratus sounded like what he says.
And only with complex classical did I get it to clip

Al
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