nathan
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- May 24, 2020
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Fair enough - but failure to level match invalidates the blindness of the testing. You've given the listener an easy cue to dectect differences which are not about the quality of the sound - but never the less are perceived as a quality difference.Nope I send people who can hear better than me run a few tests at the same levels ask which they liked run the same tests without changes to check if they think I've changed something then use that to determine which they preferred.
one friend is literally blind I trust her ears more than mine.
I have fun testing peoples perception of bias, but some tests are night and day no matter what volume is set. Don't get me wrong I love science methodology, but you know what....... you like what you like
Hi Ant I appreciate the flow of traffic and the response and ASR has the equipment to test analytical data that I love, takes out the costly work to be done. Sometimes sitting having a beer listening to what you like is what's it's all about. I listen to cheap equipment to appreciate the better ones, sometimes my perspective gets reset. My post on the A07 highlights somepeople prefer different products made by different manufacturers as do I. My equipment is decade's old and mixing a lesser quality unit sometimes yields better results.Fair enough - but failure to level match invalidates the blindness of the testing. You've given the listener an easy cue to dectect differences which are not about the quality of the sound - but never the less are perceived as a quality difference.
If you are interested in carrying out blind testing that has some validity See:
Audio Blind Testing - You Are Doing It Wrong!
Hi.... err.... Lux?Hi Ant I appreciate the flow of traffic and the response and ASR has the equipment to test analytical data that I love, takes out the costly work to be done. Sometimes sitting having a beer listening to what you like is what's it's all about. I listen to cheap equipment to appreciate the better ones, sometimes my perspective gets reset. My post on the A07 highlights somepeople prefer different products made by different manufacturers as do I. My equipment is decade's old and mixing a lesser quality unit sometimes yields better results.
By the way the pots are different which is why usually I set one at 9.00 the other 12.00.
Push.Does anyone know how much input voltage the V3 can handle without clipping?
Amir measured 190W into 4Ω with 48V PSU. That is about 27.5Vrms output voltage.Does anyone know how much input voltage the V3 can handle without clipping?
That's interesting. Near as I can tell, my AVR line outs can possibly go as high as 5vrms, so I better be careful and NOT turn up the V3 (with 48v power supply) pot to max.Amir measured 190W into 4Ω with 48V PSU. That is about 27.5Vrms output voltage.
Gain was measured at 26.4dB, so the amp amplifies voltage by a factor 20.9
I assume the measurement was with volume pot at max.
So clipping with 48V PSU will only happen with at least 1.31Vrms input (or more depending on the volume control).
I suspect @Dreyfus is interested in clipping at the input stage (normally related to the power rail voltage of the input stage). So if the volume is turned down such that the amp doesn't clip. How much input voltage can be applied to the amp without the input stage being driven to rails.Amir measured 190W into 4Ω with 48V PSU. That is about 27.5Vrms output voltage.
Gain was measured at 26.4dB, so the amp amplifies voltage by a factor 20.9
I assume the measurement was with volume pot at max.
So clipping with 48V PSU will only happen with at least 1.31Vrms input (or more depending on the volume control).
EDIT: On the other hand you need a source with at least 1.3Vrms to drive the amp to full power. So older gear with line levels in the 200-500mV range are not a good fit.
Well unless FOSI wanted to make their amp incompatible with 50%+ of sources, including pretty much all CD players, they will be able to accommodate 2V with significant headroom.@antcollinet
Indeed, I was referring to the input stage.
My DAC is an EX5 with 2.1V of line level. I was just asking since I'd like to know how much of the volume range in percent I can effectively utilize to control the total volume of the chain without driving the amp input into clipping. The pot of the V3 itself would stay fixed since I prefer the remote of my DAC to control both headphones and speakers.
Yeah, I thought about that too, but this is not measured because nobody cares. It is not a problem.I suspect @Dreyfus is interested in clipping at the input stage
How many other products do you know of that have been improved in an updated version to integrate a user request?Someone pointed to me this:
Fosi Audio V3 2024 Version: https://fosiaudio.com/pages/v3-2024-version
Lets see, what changes were implemented in V3 to enhance buyer satisfaction and value?
Did they add PFFB? No.
Did they add a separate power switch (i.e. a switch not integrated into the volume)? No.
Did they add better thermal coupling between the TPA3255 chip and the amplifier case? No.
Did they add better components? No.
Well, what have they added to justify the "V3 2024 version" status? The former pre-out is now controlled by the V3's power switch and volume.
Fantastic Fosi, what an improvement! They really listened to what people wanted.
Take note @Fosi Audio:
- For a company to be successful, it needs both innovation and marketing.
- Although Fosi is already known for its agressive marketing, innovation is still a crucial factor.
- When it comes to innovation (i.e., something new that brings satisfaction and value for the customer), it's important to avoid lazy engineering. Unfortunately, this has caused the downfall of many manufacturers, not just in the audio equipment industry.
Don't make the mistake of thinking that something unimportant to you is not important to someone else. There were many complaints about the pre-out not being volume controlled, because it is useless for a Sub.Someone pointed to me this:
Fosi Audio V3 2024 Version: https://fosiaudio.com/pages/v3-2024-version
Lets see, what changes were implemented in V3 to enhance buyer satisfaction and value?
Did they add PFFB? No.
Did they add a separate power switch (i.e. a switch not integrated into the volume)? No.
Did they add better thermal coupling between the TPA3255 chip and the amplifier case? No.
Did they add better components? No.
Well, what have they added to justify the "V3 2024 version" status? The former pre-out is now controlled by the V3's power switch and volume.
Fantastic Fosi, what an improvement! They really listened to what people wanted.
Take note @Fosi Audio:
- For a company to be successful, it needs both innovation and marketing.
- Although Fosi is already known for its agressive marketing, innovation is still a crucial factor.
- When it comes to innovation (i.e., something new that brings satisfaction and value for the customer), it's important to avoid lazy engineering. Unfortunately, this has caused the downfall of many manufacturers, not just in the audio equipment industry.
Someone pointed to me this:
Fosi Audio V3 2024 Version: https://fosiaudio.com/pages/v3-2024-version
Lets see, what changes were implemented in V3 to enhance buyer satisfaction and value?
Did they add PFFB? No.
Did they add a separate power switch (i.e. a switch not integrated into the volume)? No.
Did they add better thermal coupling between the TPA3255 chip and the amplifier case? No.
Did they add better components? No.
Well, what have they added to justify the "V3 2024 version" status? The former pre-out is now controlled by the V3's power switch and volume.
Fantastic Fosi, what an improvement! They really listened to what people wanted.
Take note @Fosi Audio:
- For a company to be successful, it needs both innovation and marketing.
- Although Fosi is already known for its agressive marketing, innovation is still a crucial factor.
- When it comes to innovation (i.e., something new that brings satisfaction and value for the customer), it's important to avoid lazy engineering. Unfortunately, this has caused the downfall of many manufacturers, not just in the audio equipment industry.
True. I would love a product like this:I think you need other amplifier, not an upgrade based on the objective features / price that Fosi have with V3.
PFFB is for other target / price tag product, for sure.
1. Regarding PFFB: page 4 (Table 1. Recommended PFFB Component Values) of the TI TPA325x Spec sheet, shows how cost-effective it is to add PFFB to a TPA3255. With only 11 components, most of which cost only a few cents each, the additional cost to the final product would be around 10 to 15€. This would put the V3 closer to the 3e audio TPA3255 260-2-29A Amplifier.PFFB, internal power supply, a 12v triggered power on switch