From an honest scriptural perspecti

From an honest scriptural perspective, our physical bodies belong to God and therefore, as stewards, we are required to take good care of them. As a result, more and more Christians today are recognizing the need to eat properly and to maintain a healthy lifestyle. These are obvious things when we recognize that our bodies belong to the Lord and we are to be good stewards of them.
The flip side of this should be obvious. As Christians who recognize our mandate to be good stewards of God's property, we should not smoke three packs of cigarettes a day for the rest of our lives. Medical evidence demonstrates that this is extremely unhealthy. We also should not eat only foods that have little or no true nutritional content. Again, this is verifiably bad for us. From a scriptural perspective, it's all about stewardship.
Unfortunately, one of the areas that often is missed in understanding stewardship is an area that is relatively easy to maintain: our hearing. According to the latest medical reports, of all those who have experienced some measure of hearing loss, between one-fourth and one-third are a result of over-exposure to high levels of sound. Worse, according to the National Institute on Deafness and Other Communication Disorders (NIDCD) more than 30 million Americans are exposed to hazardous sound levels on a regular basis. These are tragic numbers, and ones that are easily preventable.
Let's be clear. Certain volume levels of sound will do damage to hearing. Sounds louder than 80 decibels are considered potentially dangerous. Both the amount of noise and the length of time of exposure determine the amount of damage. The higher the volume, the less time is necessary to damage hearing (see chart below). It's not a matter of "maybe" or "perhaps." These findings are scientifically verifiable.
It seems obvious, then, since the Lord calls us to be good stewards of our physical bodies, we need to be careful with the volume levels to which we subject ourselves and others. We dare not damage our hearing and/or the hearing of others simply because we like loud. Such a scenario would clearly demonstrate a lack of good stewardship.
So, to the point of how loud is too loud for church music, I recommend investing in a sound level meter (decibel meter) for your church. You will then be able to monitor the level of sound and thereby be careful with the volume.
So let's get specific. According to the chart below, with each increase of 3dB, the time necessary to cause damage is cut in half. That means if your music spikes to 130dB for just one second, you can do damage to people's hearing. Could anyone honestly equate such a scenario to being a good steward? I know I can't.