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Passive Radiator vs Open Baffle Bass
Passive Radiator vs Open Baffle Bass
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Old 15th May 2013, 12:41 AM   #11
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK

An 18" bass + 2x18" PR's to be used above a subwoofer is seriously
OTT stuff, probably pointless and not thought through seems to me.

Just converting the the OB to a sealed box (about half the volume
of the PR box) would give you oodles more bass and low bass SPL.

I cannot see any scenario for PR's above a lower bass subwoofer,
transient response and integration will be poor. Parallel with the
PR's tuned deep and tight is a different matter. That could work
well with music with the sub off and then add the sub for AV.

rgds, sreten.
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Old 15th May 2013, 02:52 AM   #12
Silent Screamer is offline Silent Screamer  Australia
diyAudio Member
Join Date: Feb 2012
Location: Brisvegas
Here is the thinking behind it. Geddes advocates the use of a three sub mixture with all subs not necessarily being the same, or covering the same frequencies for movies to create a fog of sub frequencies.

The left and right Pro 5100 subs / lower bass (with 2 x PR in each) have a higher efficiency then the Ultra LMS 5400 lower frequency sub, which means I could for the biggest part use only the Pro 5100s off a smaller amp for both music and movies. When the movie requires seriously low bass fire up the LMS 5400 sub. If the Pro 5100s were tuned for higher frequencies (i.e. not adding a lot of weight to the PR) I thought it might integrate better into an active 4 way system.

Should that fail I could tune the Pro 5100s lower and add some cheaper OB woofers back into the mix, that are better suited to OB, while the TC Sounds are great drivers, and sound fantastic, they are not really well suited to OB with their low QTS.

Also buying just the two PRs at this point, if the Pro 5100 don't work well in the desired arrangement, I can merely slip the Ultra LMS 5400 into the box I build and use it for deep sub. So either way I am going to wind up using them.

Last edited by Silent Screamer; 15th May 2013 at 02:56 AM.
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