Passive radiator out of phase issue. What's the best placement of passive radiator
JonathanPeterson
Posts: 103
So it seems front firing passive radiator will always be 180 degrees out of phase with main woofers. Do rear firing radiators sort of help with phase alignment.
Are there any other clever tricks to modulate out of phase play of passive radiators
Are there any other clever tricks to modulate out of phase play of passive radiators
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Really?
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It takes a special kind of stupid...The Gear... Carver "Statement" Mono-blocks, Mcintosh C2800 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD
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Aye carumba- Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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I’m not sure how passive radiators work, so I looked it up. Nobody mentioned anything about them being out of phase. I can understand a slight bit of lag in the response, but certainly not out of phase.
https://en.m.wikipedia.org/wiki/Passive_radiator_(speaker)Lumin X1 file player, Westminster Labs interconnect cable
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It’s that Stephen King time of year again. Children of the corn are coming in from the fields....The Gear... Carver "Statement" Mono-blocks, Mcintosh C2800 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD
“When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson
How many flies need to be buzzing a dead horse before you guys stop beating it? -
Are you for real?
It's physically impossible for a PR to be "out of phase". They would have to be active radiators to be out of phase and we call active radiators, drivers or speakers to the lay person.
A passive radiator does the same thing as an enclosure vent but instead of being tuned for a specific frequency resonance to reinforce the bass response, a PR is weighted and fluid coupled to the active drivers in the common enclosure to reinforce low end frequency response over a larger range.
Ported enclosures get loose and "farty". PR enclosure don't unless something on the PR failed like part of the suspension structure or there is an issue with the weighting or if any enclosure stuffing has come undone and is impeding movement of the PR.Expert Moron Extraordinaire
You're just jealous 'cause the voices don't talk to you! -
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Ugh. I'm not dealing with this at 1 am on my phone.
I'll educate you tomorrow from an actual keyboard.Expert Moron Extraordinaire
You're just jealous 'cause the voices don't talk to you! -
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You have no idea what you are in forExpert Moron Extraordinaire
You're just jealous 'cause the voices don't talk to you! -
Someone posted a graph here back in the day demonstrating the frequency roll-off or dip when incorporating a PR.
One thing's for sure, it's efficiency is directly related to how well your cabinets are sealed. The weak link is the factory tweeter gasket seals and the condition of the MW spider cloths I have found. Some are more porous than others. There is a white mold that has an affinity to the spider cloths and dust cap cloth cellulose material.
Don't take experimental gene therapies from known eugenicists. -
JonathanPeterson wrote: »This is a quick recap on how they work
https://youtu.be/Ngj6HCfFnJo
Spring analogy is pretty accurate. So looks like they play by themselves..not in ideal synchrony with main drivers.
Nooshinjohn please remind your relatives and friends that inbreeding is bad.
Based on the video you shared PRs are presented in a positive light. He demonstrated with the spring that a PR responds to slower/longer frequencies.
How can something that derives its motion (PRs) from a separate active device (active bass driver) be expected to move instantaneously/simultaneously with the active device?
In this regard, the problem remains the same whether the PR is located on the front, side, rear, bottom, or top of the cabinet.
Am I understanding your question, correctly?
Otherwise, you may be able to get the specific answer to your question by contacting Definitive Technology directly.
Lastly, if you don’t feel you’re getting the SQ you are seeking with a PR in the system, you might consider acoustic suspension designs (closed-box / sealed cabinet) instead.CD Players: Sony CDP-211; Sony DVP-S9000ES; Sony UDP-X800M2 (x2); Cambridge Audio CXC
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Not sure of the need for derision. Seems like a fair question to me and definitely something interesting to ponder over the first cup O joe. This guy on Audiogon seems to have an insightful answer and I hope he doesn't mind me posting it here:
George / NJ
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Is this gonna be another Polk classic thread? It sure does have all the right ingredients of one.
Think black paint, porthole and the like.....Anyhoo, carry on. This should prove to be entertaining. I'll grab the popcorn fellas...
Everyone cop a squat and get comfortable. I'll have my other half bring the adult beverages and finger food for later on when the gettin' starts gettin' good.
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Was this the one @xschop ? You can see the notch in the output of the driver at the passive radiator resonant frequency, where it is dampened by the PR and the PR predominantly takes over.
PS: I see this thread has been removed from "Recent Discussions". Cancel Culture at work?
George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
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Yes, that was like it. Reason why I Power Ported my first CRS+ set as they took less power to achieve higher bass spl in those frequencies.Don't take experimental gene therapies from known eugenicists.
