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Sennheiser HD650 driven by class a amplifer?
Sennheiser HD650 driven by class a amplifer?
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Old 12th March 2020, 02:10 AM   #1
gadut is offline gadut  Indonesia
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Default Sennheiser HD650 driven by class a amplifer?

I have been using my HD650 for a year at my office using headamp design based on opamp. if i recall my memory, i thought that i read somewhere that someone plug HD650 to class a amplifier F2J and other user connected it to 300B

i am always tempted to plug my cans to either J2/M2/SIT L'amp that i have but worried if i burn the voice coil

any advice to protect my cans? maybe adding parallel high power resistor?

thanks
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File Type: jpg IMG_20200224_191047_547.jpg (92.3 KB, 313 views)
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Last edited by gadut; 12th March 2020 at 05:28 AM.
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Old 12th March 2020, 03:12 AM   #2
rayma is offline rayma  United States
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I'd worry more about your ears, since they will produce 115dB with only 1V input.
Any headphone can be damaged, but a parallel resistor won't help.
A coupling capacitor (50uF bipolar) will protect from DC due to amplifier failure.
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Old 12th March 2020, 03:18 AM   #3
abraxalito is offline abraxalito  United Kingdom
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Ken Rockwell disagrees on the sensitivity - his measurements give 103dB @1V, 1kHz

Sennheiser HD 650 review

They are 300ohm cans, need more volts than the average. 2VRMS goes loud enough for me (but I have HD6XX which are essentially the same drivers).
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Old 12th March 2020, 05:35 AM   #4
gadut is offline gadut  Indonesia
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Quote:
Originally Posted by rayma View Post
I'd worry more about your ears, since they will produce 115dB with only 1V input.
Any headphone can be damaged, but a parallel resistor won't help.
A coupling capacitor (50uF bipolar) will protect from DC due to amplifier failure.
being sinusitis and tinitus, I can't listen thru my cans on high level. IEM is already blacklisted for me, my eardrum can't stand it. i have many 10uf from oil to solen, i will try 50uf

Quote:
Originally Posted by abraxalito View Post
Ken Rockwell disagrees on the sensitivity - his measurements give 103dB @1V, 1kHz

Sennheiser HD 650 review

They are 300ohm cans, need more volts than the average. 2VRMS goes loud enough for me (but I have HD6XX which are essentially the same drivers).
good starting point, i might start with SIT which has lower gain. have tried connecting it to your amplifier? btw what is your headamp now? i have amb a20 but unfortunately its psu is not working
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Old 12th March 2020, 05:43 AM   #5
abraxalito is offline abraxalito  United Kingdom
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My amp is my own design MOSFET classA SE. There's a schematic and PCB for it if you like but its only a buffer (gain 0dB). Works fine with a 2VRMS feed from a DAC.
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Old 12th March 2020, 06:26 AM   #6
BesPav is offline BesPav  Russian Federation
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Quote:
Originally Posted by gadut View Post
worried if i burn the voice coil
They can't be burned by most opamps since the relatively high resistance and relatively big diameter.
Say, with 12 V DC in case of amp malfunction will result in only 0,5 W heating.
Tubed designs could be potentially more disasterable due to high voltage, but they mostly have trafo at the output while OTL really needs some DC protection.

Burn them with a signal is a nonsense. Your brains first will be pressed out through nostrills.


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any advice to protect my cans?
Any preferable relay-based DC protection.
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Old 12th March 2020, 08:58 AM   #7
gadut is offline gadut  Indonesia
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@Bespav

thanks for reminding me about ohm law, with my FW clone 25W 14Vrms, yess it should only create small heat. i might consider that dc relay protector
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Old 12th March 2020, 02:58 PM   #8
xrk971 is offline xrk971  United States
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Sennheiser HD650 driven by class a amplifer?
You can get a SSR DC protect circuit that will protect your headphones from high DC. However, speaker amplifiers are capable of high transients which can blow a coil and neither DC protection nor capacitors for DC block will solve that. You almost want to use something like 6.8v (or whatever you feel is needed) Zener diodes in series back to back to shunt anything exceeding the Zener setpoint.
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Old 12th March 2020, 03:48 PM   #9
00940 is offline 00940  Belgium
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To properly connect headphones to speaker amps, you at first need a resistor divider. This will protect your headphones from excess power and improve the signal to noise ratio significantly. See attached.

On top of it, you can follow the adapter by a dc protection module made for headphones.
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Old 12th March 2020, 06:34 PM   #10
Andersonix is offline Andersonix  Sweden
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Sennheiser HD650 driven by class a amplifer?
Project 100

I made Version 2 (2-ohm) of this power amp to headphone adapter, which works fine as long as your amp has low DC offset. DC blocking caps could be added if needed....
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