High Efficiency Speaker Asylum

Need speakers that can rock with just one watt? You found da place.

Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.
You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.

You must login to use this feature.

Inmate Login

By default, logging in will set a session cookie that disappears when you close your browser. Clicking on the 'Remember my Moniker & Password' below will cause a permanent 'Login Cookie' to be set.

Moniker/Username: The Name that you picked or by default, your email. Forgot Moniker?	Examples "Rapper", "Bob W", "joe@aol.com".
Password:	Forgot Password?
	Remember my Moniker & Password ( What's this?)

If you don't have an Asylum Account, you can create one by clicking Here.

Our privacy policy can be reviewed by clicking Here.

Inmate Comments

From:
Your Email:
Subject:

Message Comments

Original Message

RE: really? do the math (it's easy!)

Posted by Tre' on March 1, 2017 at 09:35:47:
What you are saying about the reverberant field is at direct odds with what Paul Joppa has repeatedly said.

" In a room, you can separate the sound field into two parts, the direct field and the reverberant field. The reverberant field is all the energy that has bounced at least once off a wall. It's very chaotic, but averaged over a region of space or frequency the mean level is uniform in the room - at least, if the room is not too weird.

The direct field falls off with an inverse square law, just as you said.

There is a "critical distance" at which the direct field equals the mean reverberant field. Beyond that distance, the averaged sound level does not vary. In an average living room, with speakers of average directivity, that critical distance happens to be approximately one meter - an extremely lucky, or at least convenient, coincidence."

When I walk around my room I don't hear the SPL drop off due to distance.

4' to 16' would be -12db in an open space. 12db is a lot of volume change.

I'm walking around my room right now with the system playing. Walking up close to the speaker (4') and back (16') and I hear nothing like a 12db change. I hear very little change at all and any change I do hear could be due to standing waves, etc.

Do you hear a 12db drop in SPL in your room going from a 4 foot distance to a 16 foot distance?

Tre'