So why are clipping indicators not standard on amplifiers in 2026?

[john61ct]

Limiting isn't necessarily better than clipping. As you turn-up the volume the peaks are limited (or clipped) but the overall average power still goes-up and it's the short-term average which overheats voice coils.

Limiting might be worse since the distortion is harder to hear.

WOW good to know I guess I'll sell that Alesis 3632.

But I was talking in the more generic sense, not "limiter tech" as the method.

> If a Wiim is in the chain (not just one source) it includes that function

I believe that is not "limiter tech" but simply abstaining from going past an X voltage setpoint, no matter how high a user is cranking the physical knob or in the app.

Is that an unusual feature in a preamp?

In any case, my question here is more "given a pre-amp signal method to prevent going too high SPL"

how do I learn at what SPL point to SET it? i.e. calibrate for each set of particular speakers?

 

[Chr1]

It would not be wise to ask or answer such a broad question. Find an amp you're interested in and do the research and find out if the particular model you are looking at has the sort of protection circuit(s) you desire.

So the amp I am using is a Topping Mini 300. Can't find anything definitive after a brief look online.

Edit : Aparently it doesn't have clipping protection. So which similar chip amps do?
It does have over current protection, but I presume this will not necessarily protect your speakers?

 

[DVDdoug]

You could do some calculations, generate a 0dB* test tone with Audacity or find one online. Then use a multimeter to measure the voltage and use a variable attenuator to adjust/limit the maximum.

It's best to measure the line-level signal without powering the speakers. Full power test-tones can damage the speaker, even if you don't exceed the power ratings ("statistical").
Or you can measure the amplifier's voltage without the speakers connected.

You may have to look-up how to calculate dB (in case gain is specified as dB) and how to calculate power.



*0dBFS is the "digital maximum"

 

[tineared]

So the amp I am using is a Topping Mini 300. Can't find anything definitive after a brief look online.

Edit : Aparently it doesn't have clipping protection. So which similar chip amps do?
It does have over current protection, but I presume this will not necessarily protect your speakers?

I don't own or have experience with those types of amps. Mine are all higher powered Parasound or Purifi amps and they have all the protection I require.
You can try to contact the manufacturer, but when buying very low cost products, the customer service is frequently suboptimal.

 

[john61ct]

You could do some calculations, generate a 0dB* test tone with Audacity or find one online. Then use a multimeter to measure the voltage and use a variable attenuator to adjust/limit the maximum.

It's best to measure the line-level signal without powering the speakers. Full power test-tones can damage the speaker, even if you don't exceed the power ratings ("statistical").
Or you can measure the amplifier's voltage without the speakers connected.

You may have to look-up how to calculate dB (in case gain is specified as dB) and how to calculate power.

*0dBFS is the "digital maximum"

Thanks lots of tooics tgere for me to learn about.

But I think my main question has still gone begging?

How do I learn or judge where the SPL point is (voltage is just a proportiinal proxy right?)

just below where my speakers will start to get damaged? I include long-term lifespan shortening as "damage"

 

[Chr1]

I don't own or have experience with those types of amps. Mine are all higher powered Parasound or Purifi amps and they have all the protection I require.
You can try to contact the manufacturer, but when buying very low cost products, the customer service is frequently suboptimal.

Thanks. Yes, most of my other amplifiers are pro-audio with clipping indicators and various other forms of protection.

I guess that it's probably unlikely that cheap chip amps will have this unfortunately. Ho hum. Seemed to good to be true tbh.

 

[NTK]

Thanks. Yes, most of my other amplifiers are pro-audio with clipping indicators and various other forms of protection.

I guess that it's probably unlikely that cheap chip amps will have this unfortunately. Ho hum. Seemed to good to be true tbh.

The TI Class D amp chips have clipping warning (output pin shared with over-temperature warning). It is up to the manufacturers to decide on whether or not to wire it to an indicator.

 

[Chr1]

Thanks. Curious if any amp manufacturers actually implement it though. Again, presumably it wouldn't add much to the final cost.
I would definitely pick one with, over one without, if buying this type of amplifier again. Kind of a no-brainer.

Particularly with this type of relatively low powered amplifier, I would suggest.

 

[DVDdoug]

How do I learn or judge where the SPL point is (voltage is just a proportiinal proxy right?)

SPL involves more calculations, including the sensitivity of the speaker.

As long as you know the power rating for the speaker you can just measure the voltage:
Power = Voltage squared / impedance.
Or Voltage = Square root of (Power / Impedance)

...The "basic" calculation is: Power = Voltage x Current. But since they are all related, the above method is simpler (and current is tricky to measure).

dB calculations are different for voltage and wattage. You get the same result. It's just a different calculation because when you double the voltage you also double the current and you get 4X the power. Decibels are relative. Double the power (wattage) is 3dB louder. If your speakers put-out 90dB at 1 Watt, they will put-out 93dB at 2W.

Using voltage (or the digital amplitude) dB = 20 x log (V/Vref).
Voltage ratio (gain or attenuation) = 10 to the power of (dB/20)

Using power dB = 10 x log (P/Pref)
Power ratio = 10 to the power of (dB/10)

Notes -
A difference (subtraction) in dB is a ratio because decibels are logarithmic.

Although real world speaker impedance varies with frequency, the power ratings are based on nominal-rated impedance so you can use that in your power/voltage calculations.

If you make these calculations, use a spreadsheet. And double-check your formulas confirming that twice the voltage is +6dB (4X power) and twice the wattage is +3dB.

 

[john61ct]

I don't want to depend on others' electrical ratings, least if all a manufacturer.

I was hoping to get a non mathematical cookbook, like hearing a crackle or measuring cone extension?

But I guess if the speaker is max SPL rated for say 102dB , just calibrate to stop at 95?

Is that measured within say 1m from the baffle?

 

[Devnull]

......

2) clipping lights, level meters, loudness switches are associated with cheap Far Eastern equipment from the 1970s. Anything that has them can't be any good.

So something like a Pioneer SX1980 is cheap Far Eastern equipment?

 

[Mart68]

So something like a Pioneer SX1980 is cheap Far Eastern equipment?

I don't think so but there's a lot of enthusiasts who consider anything Japanese to be 'mid-fi' unless it's Accuphase, Kondo, that sort of thing.

Certainly you can forget Sony, Pioneer, JVC, Hitachi, Kenwood, Sansui. They wouldn't even consider it.

 

[gwing]

I don't think so but there's a lot of enthusiasts who consider anything Japanese to be 'mid-fi' unless it's Accuphase, Kondo, that sort of thing.

Certainly you can forget Sony, Pioneer, JVC, Hitachi, Kenwood, Sansui. They wouldn't even consider it.

SINAD is probably a better measure of quality rather than geography but there is an old proverb about fools and money.

 

[Mart68]

SINAD is probably a better measure of quality rather than geography but there is an old proverb about fools and money.

I know in the States it was a broader church but over here we had retailers who didn't stock any Japanese brands at all. Probably we still do.

 

[babadono]

my meter bridge

 

[MRC01]

This one is circa 1994, and the ones they're making in 2026 still have them. The top light "distortion alert" triggers at 1% THD. I've seen it flicker once in the 30+ years I've owned it. Never had thermal protection kick in.

 

[EJ3]

And if you're going to do clip indicators like pro sound why not soft clip limiters? More useful to the majority of the end users than a blinking LED.

I am an owner of both of the following amps:
With the NAD 2200 (and some of their other amps) has clipping indicators AND there is a selector switch to do just that:
Since any amp has to start clipping after max power (going above max audio power gives an improper sine wave on the scope and often inaudible damaging distortion that kills a speakers voice coils) NAD's soft clip feature is merely a limiting system that help keeps your music from damaging your speakers from clipping. As long as you never try to reach max power you may never need to turn it on. If you are one who mischievously 'exercises' your amp then the soft clip feature may possibly save your voice coils sometimes from clipping torture from the amp's overuse.
Here is an amp dyno test of what it can do:

The PROTON D1200 is a bit different (while it has both meters and clipping indicators, does things a bit differently when it comes to pushing it too hard:
It is protected against short-circuits by relays that shut it down in such an event, and it has no current-limiting circuits that could prevent it from driving low-impedance speaker loads (or that could cause distortion under certain load and drive conditions).
Here is an amp dyno test of what it can do:

 

[BeepPeep_61]

My MC601 have Power Guard, but given the medax power used of around 60W..... I've never seen them turn on...

 

[BeepPeep_61]

My MC601 have Power Guard, but given the medax power used of around 60W..... I've never seen them turn on...

 

[pjug]

This one is circa 1994, and the ones they're making in 2026 still have them. The top light "distortion alert" triggers at 1% THD. I've seen it flicker once in the 30+ years I've owned it. Never had thermal protection kick in.

View attachment 522669

It seems like it should be possible for someone to make an external device that works as a clipping distortion alert, just plugging into the amp or speaker terminals and not needing to connect to the amplifier rails. Maybe just by detecting elevated ultrasonics. I don't see anything like that for sale though. Any thoughts whether this could work very well?