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PP15-M

15" Marine PowerPipe Subwoofer

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The basic design behind the Power Pipe is to move large amounts of air through a relatively small hose, which resonates at a tuned frequency of about 35Hz. This is achieved through the drivers design and surrounding sealed cabinet composition. Because the woofer has been tuned with its acoustical peak in the region of frequencies where bass energy in music and movie soundtracks tend to be greatest, the driver can operate at the frequencies within its linear cone excursion range, and rely on the band pass flextube to simply "amplify" its output. Features all aluminum drivers mounted inside a sealed enclosure. The front of each unit features a sealed band pass port, where the flextube attaches and from there connects to any number of available port options. As each of the Power Pipe subwoofers are passive, they can all be powered by James Loudspeaker's M1000 DSP amplifier, providing up to 1000W of power. The PP15-M comes standard with a 15" aluminum woofer, housed inside a studio black cabinet. The standard flextube is 30" long and 8" in diameter, but can be cut down to 24" without it affecting the tonal frequency range. A longer flextube can be ordered to accommodate various placement options but cannot be extended beyond 36" without it affecting the drivers tonal output.

Specifications
Frequency Response

18-150Hz +/-3dB

Nominal Impedance

4 ohms

Sensitivity

95dB 2.83V/1m

Recommended Power Range

250 - 1000W

Recommended Amplifier

M1000

Woofer

(1) 15" (381mm) Aluminum

Enclosure

Aircraft Marine Grade Aluminum

Finishes

Black

Width

16.5 in (419.10 mm)

Depth

24 in (609.60 mm)

Height

17.125 in (434.97 mm)

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1500ptm cmyk web

PP15-M - Available downloads

Title: 1500PTM

1500ptm cmyk web
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Stairs pp

PP15-M - Available downloads

Title: PowerPipe Hidden Under Staircase

Stairs pp
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Lr img 1555 copy

PP15-M - Available downloads

Title: GALLERY Architectural-Hidden-LR_IMG_1555-copy.jpg

Lr img 1555 copy
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Pp floor vent

PP15-M - Available downloads

Title: PowerPipe floor vent installation

Pp floor vent
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Powerpipe in marble

PP15-M - Available downloads

Title: Toekick in marble

Powerpipe in marble
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Pp hidden theater

PP15-M - Available downloads

Title: PowerPipe Disguised as Ventilation Grate

Pp hidden theater
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Pt under bbq

PP15-M - Available downloads

Title: PowerPipe under outdoor BBQ

Pt under bbq
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Under stair deck 3

PP15-M - Available downloads

Title: PowerPipe Outdoors

Under stair deck 3
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Powerpipe marine 1

PP15-M - Available downloads

Title: Powerpipe in a marine installation with custom wood grille

Powerpipe marine 1
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Category FAQs
Answer:

We get at least one question per week about making a powerpipe tube longer or shorter, and ask if it is possible, or what the ramifications would be. It is important to realize that a powerpipe subwoofer is a completely integrated design including the transducer, enclosure and the tube, or port – it is a sophisticated tuned system. With that in mind, let’s look at how the tube, or port length, affects the performance. Powerpipes are a bandpass system, meaning their frequency response has a bandpass shape with a low frequency cutoff and a high frequency cut off.

In the graph below, the red curve is a perfectly tuned powerpipe. The 1W sensitivity is about 89dB, the lower -3dB point is around 25Hz and the upper -3dB point is 90 Hz – perfect for a subwoofer.

The two additional curves show the affect of using a tube which is half the correct length and twice the correct length. The longer tube (black curve) tunes the system much lower so some efficiency is lost, the lower cutoff has moved down, but so has the upper, and shape has tilted. The shorter tube (blue curve) has the opposite effect, raising the lower cutoff and raising the upper cutoff, while also raising the efficiency. Again, the curve is tilted but in the opposite direction. One thing not shown in the simulation is how much port noise is created in each tuning and at what frequency – so guessing which has the least audible affect is difficult.


So even though the tube lengths have been drastically altered, with judicial use of EQ and additional amplifier power, these 2 modified tubes might still be acceptable in an installation, so if you have no choice but to shorten or lengthen a tube by 50%, it might still work for you. But we recommended about a ±6-inch change to the tubes provided, which is always less than a 50% change. 


If you need to run a very long distance, we can modify the port diameter and possibly get you the performance you need – please call the engineering group for more information.

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