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View Full Version : to Dave..passive sub ?



dew30296
08-09-2012, 06:07 AM
I was wondering....the bass extension is so close to complete would a passive radiator such as a Seas sp18r or a ScanSpeak 23w/0-00-02 added to the towers/center would either add the finishing touch or not instead of the port?

curtis
08-09-2012, 10:04 AM
Using a passive radiator instead of a port would not effectively give deeper extension.


The frequency response of a passive radiator will be similar to that of a ported cabinet, with two exceptions. The system low frequency roll-off in a passive radiator design will be slightly steeper, and will have a notch (dip) in frequency response due to the Vas (compliance, or stiffness of the speaker cone) of the passive radiator. The goal in designing a passive radiator is to adjust the tuning so that this notch is below audible levels.

http://en.wikipedia.org/wiki/Passive_radiator_(speaker)

dew30296
08-09-2012, 05:23 PM
Well..ok..noted..thanks.

dew30296
08-14-2012, 04:23 PM
Ok how about this for a thought.... The sierras 1s need stands. How about making them functional with a subwoofer/crossover either powered or unpowered. Giving people with limited room for a separate sub enclosure the bottom end option.

Blutarsky
08-15-2012, 07:25 AM
Like this?

http://www.usheraudiousa.com/products/loudspeakers/usher-series/SW-520

Blutarsky

curtis
08-15-2012, 10:08 AM
Then why not just build a floorstander?

I wouldn't want a subwoofer built into the stands. Standalone subwoofers allow for better/proper placement in the room for those frequencies.

dew30296
08-15-2012, 11:28 AM
I've read about the Ushers. They don't extend low enough for thr effort. A florstander is is the best option. I have the gun loaded for the towers/raal very shortly. I was just stating it for an option for those with the books already. I also understand that the towers have a better mid section vs the books. But you can't improve that section without changing the entire design. I was merely stating it for those who have limited space and don't want to completly upgeade.

While I'm at it. Opinions on a svs or rythmic for a sub.

Equipment to date...
Oppo bdp 95
Marantz av7005
Emotiva xpr 5

Soon..
Sierra towers/raal
sierra center/raal

dew30296
08-15-2012, 11:36 AM
I just remember the old days where you didn't need a sub because the big ass towers in a 2.0 system coverd it all..I have a pair of polk sda 1c's. That need to be rebuilt. But they were amazing at there best.

curtis
08-15-2012, 12:24 PM
While I'm at it. Opinions on a svs or rythmic for a sub.

For sound quality, Rythmik.

curtis
08-15-2012, 12:27 PM
I just remember the old days where you didn't need a sub because the big ass towers in a 2.0 system coverd it all..I have a pair of polk sda 1c's. That need to be rebuilt. But they were amazing at there best.
The bass from those towers, still would not compare to what is available with today's subwoofers.

Many music recording studios now record "two-channel" with a sub nowadays.

Blutarsky
08-15-2012, 02:41 PM
I know that there are good in-wall subs out there.

If we ever get a small home, I plan to check out in-wall Home Theater.

I realize there would be compromises.... It would be cool in different ways.

My wife would love it, that can be a good thing.

B.

dew30296
08-16-2012, 06:18 AM
Yea...as the old saying goes" If mammas happy...everyones happy"

Blutarsky
08-16-2012, 08:33 AM
Yes, one of the great secrets of life... Passed down through the centuries by wise sages. 14th level stuff.