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: T/S Parameters ?

Posted by freddyi on August 12, 2012 at 15:48:18:
almost always the lowest moving mass with the strongest motor - the fullrange folks over at diyaudio think Beta 12LTA is a powerhouse - it does have pretty good midrange sensitivity in a Karlson 12 but kinda misses the transient snap of drivers with stronger motor.
since a speaker is buried deeper in the klam type than the Ultra Fidelity style, it may have more bounce artifacts than a regular Karlson coupler. Boosting the highs or running the coax HF a bit higher than normal will offset some of that stuff - its really not heard at some distance back. Karlson was probably right to say the front chambers needed several coats of varnish and in the 10" klam used a thin sheet of acrylic on the top plate. That seems to be a pretty good klam other than the particleboard flexing too much. Karlson's 15" klam AP100/Oliver Magna-Clam looked like it was somewhat scaled from the 10" model and was said to run an Altec 421 plus a K-tube tweeter - that one went into Radio City Music Hall.
I think it would be fun to cut the dust-screen out of an Eminence Beta series coax and mount a K-tube down into its horn exit - extend the tube so the tube's aperture merges with the main aperture - brace the 1" plastic pipe tube to the top plate with a small piece of plywood bored with a 1 1/4" bit.
the original 12" Karlson is a kicky little thing for its size and could run an internal K-tube to keep things compact and safe for club use. With a handle on top it could be easily carried. A top mounted K-tube would sound nice and blend well too.
my sample of the Oliver Phase III klam had a lapped cone 10" alnico magnet
guitar speaker - I think Eminence makes a guitar 10 with similar cone today. Phase III was vented and from what I understand, so was the 15" klam. From what I can tell, a sealed rear chamber may be better with sources with powerful drum transients. A little 8" klam makes a pretty big noise.