Planar Speaker Asylum

Welcome! Need support, you got it. Or share your ideas and experiences.

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: MMG MiniDSP and bi-amp Questions

Posted by neolith on February 24, 2012 at 07:03:21:
For a first order LP filter fc= R/(2*pi*L) which works out to 290 hz for a 4 ohm load with a 2.2 mH inductor. For a 2nd order filter the fc= 1/[2*pi*sqrt(L*C)], so for the original MMG this is 1/[(2*pi*sqrt(2.2*24*10^-9)] or 680 Hz.
I was unaware that the original MMG tweeter had an impedance of 2.6 ohm, in which case the fc is 2550 Hz as you stated. I will need to update my spreadsheet.
BTW, Tasmon reported the woofer inductor as 0.75 mH while the official schematic (both on the Tweaks page) is 2.2. I never understood why one would want to go to a capless crossover as the inductor is the least ideal of the passive devices -relatively expensive, poor tolerances, very real capacitance and resistance, limited values, etc.