Thank you for the feedback! Appreciate it
Doh! 3.5mm is TRS adaptable 3-pin butThat is impossible, a 4-pin to 2-pin adapter will lose half the voltage. There isn't enough pins on a standard 3.5mm adapter to give you the full output.
(Ebay/amazon sellers selling such a thing should be ashamed).
I think you are mixing up input and output and are forgetting there is an amplifier in between.Doh! 3.5mm is TRS adaptable 3-pin but
Not being an electromagician it seems to me that the 4-pin XLR delivers 4 volts and the TRS delivers 2 volts
it shouldn't matter whether voltage is delivered balanced or down one pair of wires.
The voltage should remain the same.
volts x amps = watts
It may be my misunderstanding of I/V = R
Or are you saying the output voltage is the same on TRS as 4-Pin XLR (exact same circuit) and there is only one output voltage on this device?
Can you help fix my stupid?
Well it's simple XLR is + and -, 2V and 2V, for combined 4V(most common), with great common-mode rejection cancelling out noise. That is balanced. When you go XLR to RCA (or 3.5mm etc) you can only pick up the + or the - signal, 2V. It's not possible with a simple adapter. You just lack the connection path. Half is lost.it shouldn't matter whether voltage is delivered balanced or down one pair of wires.
The voltage should remain the same.
volts x amps = watts
It may be my misunderstanding of I/V = R
Or are you saying the output voltage is the same on TRS as 4-Pin XLR (exact same circuit) and there is only one output voltage on this device?
Can you help fix my stupid?
2 such cables arrived yesterday, tested and they do work.View attachment 223377
Hi, I need to connect L50 to smsl m500 dac. Is the above 3pin xlr female to TRS 6.35mm cable appropriate? Thanks
That's pretty much exactly what's been happening with mine, very annoying, manual says blinking LED means "unexpected output" guessing some kind of protection is being triggered, but why and by what I don't know.
Hi,
Thank you for your video. In the video, L50 blinks four times and pauses for two seconds, indicating that L50 detects the direct flow and triggers the headphone protection.
We recommend that you set the L50 to medium gain or turn down the volume a bit.
Best Regards
--------------------
TOPPING SERVICE
So I emailed Topping Service about it and here's the reply I got back after sending in a video:
Sounds legit, the only problem I have with my medium gain setting, to get it to a volume I like, I'm nearly at the end of my volume knob so I like high gain around 9-10 o'clock. However, I'm going to do some testing to see what happens now that I understand a little bit more.
I also asked them if they have a public facing document that explain the different blinking scenarios, we'll wait and see if they do but it's likely an internal only document they have.
I just got one of these in and the volume wheel doesn't have any slack in it or delay. Next week I have another and can check on that too, but this one is crisp without any lag/delay in it. I really like the sound of this with a Topping D10b, they're a really good match. Also these 600ohm Beyerdynamic DT880's are no match for high gain mode, can't get past 50 percent volume before its too loud to be safe. Best part of these it doesn't raise the temp by 1-2 degrees in the room like the A30Pro did when it's left on. There's an SP200 next to it and it's not even as lightly warm as that can get. Going to try this on the Sennheiser HD800s next and see how it is.I have a question for Topping L50 owners. My unit has somewhat shaky/loosy volume knob. In other words, I need like 1-2° before starting to feel resistance and the volume would actually change. It almost feels like it dampened in some way. Before this I've had an Atom AMP and the knob there felt very crisp and sturdy.
Do you have similar issues with your L50 units?
Thanks in advance
Keep in mind that Topping A30 Pro has a bigger power supply, able to provide more power and is located inside the unit, whereas the L50 has an external power supply.Best part of these it doesn't raise the temp by 1-2 degrees in the room like the A30Pro did when it's left on.
This is important to me as well since I'll be using a Topping E30 as the source with just 2Vrms input, wondering if we have official word or measurements of the output power at 300 ohm (if not more impedances as well perhaps) with unbalanced 2Vrms in. I was disappointed with the L30 (v1) and ended up returning it. I got a good deal on a refurbished Topping L50 but can (and will) return it for the L30 II ultimately if needed and if I'll have a decent amount of headroom for EQ.It sounds like you're saying that the gain is the same regardless if single-ended (RCA) or balanced (XLR/TRS) inputs are used. Not what I expected.
By the way, regarding input sensitivity of Topping L50. The specsheet says: 2.7 Vrms for Hi Gain mode with BAL input, but the nominal BAL output for the DAC is 4 Vrms! Does it mean that I clip by default when using BAL OUT of the DAC with HI GAIN mode of L50?@hovation
Let's do some mathematics:
Official specifications for L50 are 540 mW at 300 ohm.
This means that your source DAC or player has to deliver an output level of:
- 2.56 Vrms at High Gain setting
- 12 Vrms at Medium Gain setting
- 63 Vrms at Low Gain setting
Both Topping E30 and E50 have an output level of 2 Vrms on unbalanced outputs.
With 2 Vrms input level you can expect from L50 the following power figures:
- 327 mW at 300 ohm, on High Gain ain setting
- 13 mW at 300 ohm, on Medium Gain setting
What headphones you intend to drive with Topping L50?
No. You clip only if you turn the volume knob up enough.Does it mean that I clip by default when using BAL OUT of the DAC with HI GAIN mode of L50?
If your DAC has a built-in preamplifier functionality, there is no reason to clip the input of the L50.By the way, regarding input sensitivity of Topping L50. The specsheet says: 2.7 Vrms for Hi Gain mode with BAL input, but the nominal BAL output for the DAC is 4 Vrms! Does it mean that I clip by default when using BAL OUT of the DAC with HI GAIN mode of L50?
@hovation
Let's do some mathematics:
The official specifications for L50 are 540 mW at 300 ohm.
This means that your source DAC or player has to deliver an output level of:
- 2.56 Vrms at High Gain setting
- 12 Vrms at Medium Gain setting
- 63 Vrms at Low Gain setting
Both Topping E30 and E50 have an output level of 2 Vrms on unbalanced outputs.
With 2 Vrms input level you can expect from L50 the following power figures:
- 327 mW at 300 ohm, on High Gain ain setting
- 13 mW at 300 ohm, on Medium Gain setting
What headphones you intend to drive with Topping L50?