The Low Volume Loudness Dilemma

I’m not an acoustician, but I’ve learned a few things about ensuring that low volume music sounds good in my office system (that’s how I listen 10-12 hrs/day):

1 - Select individual components that others describe as sounding good at low volumes, especially when it comes to speakers and amps

2 - Use a well set-up subwoofer. Its effect is nearly subliminal at low volumes, but it’s there, and it helps

3 - Control external/extraneous, steady state sound in the enviornment to the greatest degree possible.

My current system sounds great at low volumes. I hope it sounds even better when my Music First Audio TVC/preamp unit arrives and I get it fully burned in. I’ve been interested in exploring the sound of well-made transformers for a long time, and this will be my chance. If the reviews and user comments hold true, I might get even clearer, more pure sound (good sound) at low volumes than I have now.

@seb_audio 

https://www.youtube.com/watch?v=XiqVYmMIEco

@wolf_garcia 

The third is a Loki Max remote EQ in my main hifi pile...this thing is brilliant.

I had a Loki Max on order when you wrote this; got it two days ago and have been fiddling with it. I agree completely with your assessment! My initial setup is to use the presets to approximate different equal loudness Fletcher-Munson curves.

The loudest I typically listen is about 80 dB SPL, but I do a lot more listening in the 65-70 dB range. With the Loki Max, I now can dial in the appropriate F-M curve to have a richer, more detailed soundstage at lower volumes. 

I hadn't really thought about it before, but F-M curves lead to the logical conclusion that, if your system is truly linear at all listening volumes, you can optimize the sound for only one listening level. The others really need to be corrected using EQ based on the science of equal loudness perception.

For you Roonies out there right now Roon’s PEQ feature can be used to build an EQ curve based on the Fletcher Munson curve (see Wikipedia) for a specific end point volume level. I used a free app on my phone (Sound Tools) to determine I wanted one for a 60 db volume level. I build an approximation of the curve using Roon’s PEQ features and WOW. It sounded great. I have put in a feature request to the folks at Roon for them to consider offering this in a bit more user friendly fashion where you just enter you desired listening room sound level and it automatically generates the appropriate curve, then you save it as an EQ for use as desired. Hope they do it.

PS- Another solution for anyone with a RME ADI2 dac, there is a built in loudness function.

Frequency loudness sensitivity aside, there are differences in the abilities of different systems to sound rich and full at low volume.  

The combination of robust amplification and higher than usual speaker efficiency gets the job done.  Look for amps that have more power as the impedance is reduced- e.g. amps that double down.  

At one extreme HE and Horn Speakers tend to do the best job at producing bass at low volume levels, something like JBL or Klipsch Heritage, Volti Audio etc.  Larger more sensitive woofers e.g. 12 to 15 inch / 90+ db efficiency for example. 

I had a really modest system with PSB tower speakers and a NAD 150 watt amp and the woofers seemed to be connected mechanically to the amp- every punch and note was felt despite very low listening levels.  

It can be done.