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Elite Shackster
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Manufacturer: SV Sound
Model: PB12-NSD
Provided by: SV Sound
Manufacturer link: SV Sound, L-Sound
Price: 711 EUR, 599 USD (+shipping)

Manufacturer specs:
• SVS designed/built long-throw 12" driver
• Full-featured 325 watt BASH digital amp
• Computer Assisted Design (CAD) enclosure
• Dual CNC'd internal braces
• Three color choices with removable grill
• Front-firing woofer/port for easy installs
• Built-in, flush-mount amp configuration
• Compliant floor mounts (six)
• Patented 4" high-flow flared porting (in and out).
• Extra heavy-duty removable 8 foot power cord
• "Seamless" cabinet design in three colors
• +/-3dB 18Hz-200hz anechoic extension
• Size: 18" wide x 21" high x 25" deep.
• Weight: 74 pounds

Configuration as tested:
Phase: 0 degrees
Crossover: Bypassed
Orientation: Woofer and port facing the mic



 

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Elite Shackster
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Discussion Starter #2


+/- 3 dB points: 15.3 Hz - 62 Hz (crossover min)

+/- 3 dB points: 25 Hz - 146 Hz (crossover max)
 

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Re: Svs PB12-NSD *new*

Yeah, I keep an "wishful thinking" list, and I've just updated it from a single SVS 20-39+ tube to 2 - PB12-NSD. Now all I need is someplace without shared walls and a little more floor space.
 

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Re: Svs PB12-NSD *new*

This is the same PB-12NSD that has been out for some time now replacing the ISD, correct? Or did I miss that they re-did the NSD?

Edit: Nevermind, I see it was just a new from factory nsd as opposed to a used one. Sorry.
 

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Re: Svs PB12-NSD *new*

Ilkka has tested two versions recently, one had an 'improved' amp -- SVS has not commented on exactly what is shipping currently.
 

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Re: Svs PB12-NSD *new*

Ilkka has tested two versions recently, one had an 'improved' amp -- SVS has not commented on exactly what is shipping currently.
The first PB12-NSD Ilkka tested was privately owned. When we saw the FR, we knew there was a problem with the amp. We contacted the customer through Ilkka and replaced that amp for the customer.

We discussed testing another PB12-NSD for his next shoot-out. Our Euro dealer L-Sound servicing Finland sent Ilkka a new production PB12-NSD from their inventory. It was not tested prior to being sent to Ilkka.

We did upgrade the amp in the PB12-NSD several months ago and the unit Ilkka tested has the newer amp. The new amp had been shipping for a few months and was in-stock with all dealers at the time Ikka tested the 2nd PB12-NSD.
 
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Re: Svs PB12-NSD *new*

The first PB12-NSD Ilkka tested was privately owned. When we saw the FR, we knew there was a problem with the amp. We contacted the customer through Ilkka and replaced that amp for the customer.

We discussed testing another PB12-NSD for his next shoot-out. Our Euro dealer L-Sound servicing Finland sent Ilkka a new production PB12-NSD from their inventory. It was not tested prior to being sent to Ilkka.

We did upgrade the amp in the PB12-NSD several months ago and the unit Ilkka tested has the newer amp. The new amp had been shipping for a few months and was in-stock with all dealers at the time Ikka tested the 2nd PB12-NSD.
Is it possible for you elaborate on the upgrade to the amp?
 

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Re: Svs PB12-NSD *new*

Is it possible for you elaborate on the upgrade to the amp?

We worked with Indigo and spec'd a few changes to improve response linearity, but we won't publicly discuss details beyond that. We make improvements/changes to all our amp platforms on a routine basis.
 

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is the number in red correct? or a typo?
Yes, it's correct. Since it is being run with basically no crossover, there is output at higher frequencies than the first FR spec. Therefore, the -6dB point (from maximum output) occurs at a higher frequency.

In other words, when you look at the FR plot, the "crossover min" has a maximum output of ~90dB @ about 37Hz. With the "crossover max", the maximum output is greater than before at ~92dB, and occurs at ~73Hz. So to find the "+/- 3dB" range you have to find the frequency which is 6dB lower than maximum.
 

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Yes, it's correct. Since it is being run with basically no crossover, there is output at higher frequencies than the first FR spec. Therefore, the -6dB point (from maximum output) occurs at a higher frequency.

In other words, when you look at the FR plot, the "crossover min" has a maximum output of ~90dB @ about 37Hz. With the "crossover max", the maximum output is greater than before at ~92dB, and occurs at ~73Hz. So to find the "+/- 3dB" range you have to find the frequency which is 6dB lower than maximum.
thanks! now I understand :duh:
 

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Re: SVS PB12-NSD *new*

Great Job SVS!!

Actual Tune seems about 20 Hz+. Did you measure itIlkka?
 

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Re: SVS PB12-NSD *new*

So why are THD curves minimal at 20-21 Hz??:dunno:
 

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Elite Shackster
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Re: SVS PB12-NSD *new*

So why are THD curves minimal at 20-21 Hz??:dunno:
That's just how the Helmholz resonator works, and also because the port doesn't work optimally when the air speed rises (=port compression). The THD minimal isn't exactly at the tuning frequency but instead a few hertz above it. You can see the same phenomenon with pretty much every ported subwoofer I have tested.
 
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