Since i could not find any answer i thought i start a new thread so that we can come to some conclusions? The reason was instead of buying expensive high power amps to use 2 inexpensive ones and have the same and more power and also to have the ability ro control channel imbalances.I t hought it would be possible with amps that have differential output but what about single ended amps?
-
WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!
Can a headphone amplifier be converted to mono?
- Thread starter Chrise36
- Start date
solderdude
Grand Contributor
What's expensive about Heresy, Atom, L30 etc ?
Need more power than those or is the lack of gain a possible issue ?
You can 'bridge' most any SE headphone amp but it requires a phase shifter (can be as simple as a line transformer with CT) and you would also have to make a special headphone cable that has 2 stereo TRS plugs (marked for L and R).
This is something else than 'mono' by the way.
A lot of hassle that, in general, can provide max. 6dB higher SPL (for higher imp. headphones) down to no improvement for low imp. headphones.
Need more power than those or is the lack of gain a possible issue ?
You can 'bridge' most any SE headphone amp but it requires a phase shifter (can be as simple as a line transformer with CT) and you would also have to make a special headphone cable that has 2 stereo TRS plugs (marked for L and R).
This is something else than 'mono' by the way.
A lot of hassle that, in general, can provide max. 6dB higher SPL (for higher imp. headphones) down to no improvement for low imp. headphones.
Last edited:
- Thread Starter
- #3
I was thinking about using 2 L30s in mono and have right left balance control. How would that work regarding the schematics? Would that need a y splitter for every channel in every amp?What if you can use an inverted signal eg from a dsp 4 channel Dac? Would that make the transformer obsolete?
Last edited:
solderdude
Grand Contributor
You can of course also use a DAC with balanced out and connect + and - to L and R for each channel.
solderdude
Grand Contributor
Using a DAC with 4V out (balanced) you would be able to reach 11V (1W, 120ohm, 0.4W 300 ohm) in high gain mode.
The A90, run from the same DAC and used balanced out would be capable of reaching 17V so that trick will not get you near the power of the A90.
The A90, run from the same DAC and used balanced out would be capable of reaching 17V so that trick will not get you near the power of the A90.
solderdude
Grand Contributor
16V in balanced out.
Can I ask you what you want to drive with it ?
Can I ask you what you want to drive with it ?
- Thread Starter
- #9
The sundaras
Why do you want to destroy them?
- Thread Starter
- #11
What are my options at about 250$ in the same level with the toppings?Why do you want to destroy them?
solderdude
Grand Contributor
Sundara is 104dB/V (acc. to Tyll)
You won't be needing to reach more than 120dB SPL so 6.3V is enough.
The L30 can reach 5.6V (with a 2V DAC) so 119dB SPL is possible on high gain, volpot completely open and music reaching peaks of 0dBFS.
You won't be needing to reach more than 120dB SPL so 6.3V is enough.
The L30 can reach 5.6V (with a 2V DAC) so 119dB SPL is possible on high gain, volpot completely open and music reaching peaks of 0dBFS.
solderdude
Grand Contributor
Then you need more gain rather than more power or a DAC with a significantly higher output voltage or a line-level step up transformer to act as a gain stage.
- Thread Starter
- #16
I am running Roon at -1 dbfs to avoid digital clipping -5db that needs for eq what voltage do i need for say 95db spl
solderdude
Grand Contributor
-6 dBFS = 1V out from the DAC. On H gain setting (+9.5dB) = 3x gain = 3V out = 113dB peak is around 100dB SPL average (depends on DR rating) = about 90-95dBA depending on musical content.
Similar threads
