17 Jul
2018
17 Jul
'18
10:06 a.m.
Hi,
I've started to live stream a bit during the last year and just now
added headphones to the mix. I started to wonder whether my audio
interface can actually supply enough power to both a condenser mic and
a pair of headphones. I figured out that newer USB standards allow for
more power hungry devices, but does that in any way help with a USB 2.0
device?
My interface is the same old Edirol UA-25 that I've been using for a
couple of years now. It is USB 2.0 and bus powered.
It needs to supply a Røde NT-1A with phantom power and drive my new AKG
K702s at the same time. I noticed that I need to increase the output
gain a fair bit to get a good level (roughly at 50%-60% whereas I
have it at 20% with speakers).
The rig I run this on I built last year, it is based on a ASUS PRIME
B350-PLUS which provides USB 2.0, USB 3.0 as well as USB 3.1 ports
(although I can't tell which USB 3.1, way to go on that naming scheme,
my only explanation is they ran out of numbers).
I don't have other gear to compare, do you think the UA-25 can handle
it properly? Is it any help to plug it into a USB 3.0 or 3.1 port?
Best Regards,
Philipp
17 Jul
17 Jul
10:26 a.m.
Hi,
It may just be the USB3 port has lower resistance wiring to it inside the
motherboard allowing for less voltage drop, but I’d have thought the
overall difference would be negligible.
It may be a wise idea to make sure the USB cable is of good quality, isn’t
too long and has thick power wires.
Cheers!
Chris
On Tue, 17 Jul 2018 at 07:06, <hollundertee(a)gmx.net> wrote:
Hi,
I've started to live stream a bit during the last year and just now
added headphones to the mix. I started to wonder whether my audio
interface can actually supply enough power to both a condenser mic and
a pair of headphones. I figured out that newer USB standards allow for
more power hungry devices, but does that in any way help with a USB 2.0
device?
My interface is the same old Edirol UA-25 that I've been using for a
couple of years now. It is USB 2.0 and bus powered.
It needs to supply a Røde NT-1A with phantom power and drive my new AKG
K702s at the same time. I noticed that I need to increase the output
gain a fair bit to get a good level (roughly at 50%-60% whereas I
have it at 20% with speakers).
The rig I run this on I built last year, it is based on a ASUS PRIME
B350-PLUS which provides USB 2.0, USB 3.0 as well as USB 3.1 ports
(although I can't tell which USB 3.1, way to go on that naming scheme,
my only explanation is they ran out of numbers).
I don't have other gear to compare, do you think the UA-25 can handle
it properly? Is it any help to plug it into a USB 3.0 or 3.1 port?
Best Regards,
Philipp
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11:52 a.m.
https://www.asus.com/us/Motherboards/PRIME-B350-PLUS/HelpDesk_Manual/
Their manual identifies which USB ports are which. The 3.1 ports are teal, type A, it
says.
On July 16, 2018 8:06:02 PM HST, hollundertee(a)gmx.net wrote:
Hi,
I've started to live stream a bit during the last year and just now
added headphones to the mix. I started to wonder whether my audio
interface can actually supply enough power to both a condenser mic and
a pair of headphones. I figured out that newer USB standards allow for
more power hungry devices, but does that in any way help with a USB
2.0
device?
My interface is the same old Edirol UA-25 that I've been using for a
couple of years now. It is USB 2.0 and bus powered.
It needs to supply a Røde NT-1A with phantom power and drive my new
AKG
K702s at the same time. I noticed that I need to increase the output
gain a fair bit to get a good level (roughly at 50%-60% whereas I
have it at 20% with speakers).
The rig I run this on I built last year, it is based on a ASUS PRIME
B350-PLUS which provides USB 2.0, USB 3.0 as well as USB 3.1 ports
(although I can't tell which USB 3.1, way to go on that naming scheme,
my only explanation is they ran out of numbers).
I don't have other gear to compare, do you think the UA-25 can handle
it properly? Is it any help to plug it into a USB 3.0 or 3.1 port?
Best Regards,
Philipp
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
https://lists.linuxaudio.org/listinfo/linux-audio-user
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gnome(a)hawaii.rr.com
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http://dancingtreefrog.com
Sent from my Android device with F/LOSS K-9 Mail.
12:52 p.m.
On Tue, 2018-07-17 at 08:06 +0200, hollundertee(a)gmx.net wrote:
I noticed that I need to increase the output gain a
fair bit to get a
good level (roughly at 50%-60% whereas I have it at 20% with
speakers).
If the input current should drop under too much load, you probably would
notice more bad effects, than just a quieter headphone output. The
culprit should be the headphone's impedance, but it's strange, since the
AKG K702 seems to have a low impedance and it should be a high impedance that should
result in quieter headphone output. However, comparing the speaker's outputs and
headphone's output loudness is insignificant, since external amplifiers are involved
when using speakers.
6:38 p.m.
On Tue, July 17, 2018 1:06 am, hollundertee(a)gmx.net wrote:
I figured out that newer USB standards allow for
more power hungry devices, but does that in any way help with a USB 2.0
device?
I think in principle a new device could support the newer power standards
and still run the data transfer as USB 2.0, but I doubt any devices
actually do that. If there were such a device it would likely have a USB
C type connector instead of the traditional square USB B connector.
My interface is the same old Edirol UA-25 that
I've been using for a
couple of years now. It is USB 2.0 and bus powered.
Bus powered means the entire device is limited to under 2.5W.
It needs to supply a Rode NT-1A with phantom power
and
drive my new AKG K702s at the same time.
Rode does not provide information about the power consumption of the
NT-1A, other microphones vary anywhere from 2mA to 10mA, usually 3mA-6mA
would probably be considered common, so using under 0.3W of your 2.5W
total power budget (per microphone).
The K702 spec lists the maximum input power as 200mW. That would be well
over 110dB, so quite loud.
So one microphone and headphones at deafening levels should only account
for 0.5W of the 2.5W available power. Should be no problem.
I noticed that I need to increase the output
gain a fair bit to get a good level (roughly at 50%-60% whereas I
have it at 20% with speakers).
You have an amplifier between the line level outputs and your speakers.
You could always add an external headphone amp if you would rather spend
more money than twist your volume knob.
Is it any help to plug it into a USB 3.0 or 3.1 port?
No.
--
Chris Caudle
10:18 p.m.
On Tue, 17 Jul 2018 09:38:04 -0500
"Chris Caudle" <chris(a)chriscaudle.org> wrote:
On Tue, July 17, 2018 1:06 am, hollundertee(a)gmx.net
wrote:
[...]
I think in principle a new device could support the newer power
standards and still run the data transfer as USB 2.0, but I doubt any
devices actually do that. If there were such a device it would
likely have a USB C type connector instead of the traditional square
USB B connector.
[...]
Bus powered means the entire device is limited to under 2.5W.
[...]
Rode does not provide information about the power consumption of the
NT-1A, other microphones vary anywhere from 2mA to 10mA, usually
3mA-6mA would probably be considered common, so using under 0.3W of
your 2.5W total power budget (per microphone).
The K702 spec lists the maximum input power as 200mW. That would be
well over 110dB, so quite loud.
So one microphone and headphones at deafening levels should only
account for 0.5W of the 2.5W available power. Should be no problem.
[...]
You have an amplifier between the line level outputs and your
speakers. You could always add an external headphone amp if you would
rather spend more money than twist your volume knob.
[...]
No.
Thank you very much Chris and everyone else, that puts my mind at ease.
The speakers are active (KRK RP5), so no amp in between them and the
audio interface. But since the audio interface should be able to handle
it without issue it's not a problem. Additional gear, e.g. a small
mixer, would add convenience to my setup, but it's not necessary at
this point.
Thank you very much for your helpful answers.
Best regards,
Philipp
11:23 p.m.
On Tue, 17 Jul 2018 20:17:57 +0200, hollundertee(a)gmx.net wrote:
The speakers are active (KRK RP5), so no amp in between
them
There is an amp in each of the speakers. You could connect anything you
own with a headphone amp to the Edirol UA-25 analog or digital outputs.
I'm not thinking about the phones loudness, but I would compare the
sound quality, of the Edirol's headphone amp with an external headphone
amp.
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6 comments
5 participants
participants (5)
-
Chris Caudle -
Christopher Obbard -
David W. Jones -
hollundertee＠gmx.net -
Ralf Mardorf