Check your settings for ‘PLAYBACK’, particularly in terms of what you have set for ‘Cellular’. There are four options: Original Quality, CD Quality, Balanced, and Bandwidth Optimised. If you’re using Original or CD Quality this will go through your data quite quickly.
Yes, it would have to. You’re also sending and receiving data to and from your Roon core in addition to the music. I would think the music streaming is most of your data usage.
Don’t feel bad. I have used 145GB of cellular hotspot data in 2 1/2 weeks streaming Tidal and Qobuz from Roon and Audirvana to my Dell laptop. I’m not using Roon ARC because it stopped working the first day I left home.
I’m switching to Apple Music directly to my iPhone for the next 1/2 week because it uses regular data, not hotspot data.
As others have said, check your streaming quality preference in ARC. Before ARC, did you stream the same amount of time from a streaming service app? Then you may want to compare with the quality preference you used in that app.
By the way, the bandwidth used by the various ARC settings is detailed here:
And I don’t know where you live, but e.g. here in Germany, the data by the audio streaming services is typically excluded from data caps in many/most subscription plans (and the phone service providers force the streaming services to pay up instead. For now - this is about to end because it violates net neutrality, meaning that services like ARC are not on equal footing)
There isn’t much overhead over the files themselves, arcs metadata will pull some data from the core at home but this is small stuff in comparison to music. As other have said check your settings as ARC will use the full bandwidth available to it if you don’t set it accordingly so that could be hires which will eat up your data plan. Any music service would do the same if lossless. Have you downloaded any files via ARC there have been reports early on where for some users it uses cellular data for this rather than the home network when they were at home.
I’ve constantly streamed Tidal in Master (where it can), and I use my (Phone) music 5 days a week for around 7 hours a day, and I’ve struggled to use more than 40GB of data in a month. Now I’m using ARC, and I’m using about the same. My plan just reset on the 29th, and I’ve used around 3GB so far out of 125GB. Come the 29th, I’ll see how much roughly ARC uses.
On my Verizon plan, it’s not cheap, but worthwhile for me. After discounts, I pay:
iPhone 13 Pro Max - $60 for 50GB hotspot + unlimited/non-throttled premium data, free Apple Music
iPhone 13 Pro - $60 for 50GB hotspot + unlimited/non-throttled premium data, free Apple Music
iPad Mini 6th Gen - $15 for 30GB hotspot
iPad 8th Gen - $15 for 30GB hotspot
Total $150 for 160GB hotspot + unlimited/non-throttled premium data on 2 phones. Free Apple Music, ESPN+, Disney+, Hulu, 600GB Verizon Cloud each phone. All four devices have unlimited/throttled hotspot after unthrottled is used up, but it’s too slow to be of much use.
When hotspot is used up, I switch to Roon ARC or Apple Music straight from iPhone to DAC.
EDIT: This is for phone service and data only. I pay cash for new phones.
In this configuration a similar listening session created a couple megabits of data across the VPN (no streaming of “local” files). So, the interaction with Core, unless you’re streaming local files, is minimal.
Wow some expensive plans. I just downgraded from 160GB plan at £16, to 125GB for £12 on EE. I was going to go for unlimited but, I never use more than 60GB a month. (Sim Only, I buy my phones outright as it’s cheaper for me)