Simple, Clear - Audio Research & Development
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Some quick facts about SEVEN products, materials, research, design & development:
-Manufactured dual voice coils @ 2ohm impedance with an outstanding "Mechanical Q" (QMS), such as 4.01. A lower Qms means tighter suspension (the spider and the surround working together).
-High Efficiency FEA optimized motors (Finite-Element-Analysis based optimization of structural mechanics in engineering). We also use the NEO motor system in research and design but have not released any NEO subwoofer models yet (if), because the market has not stabilized.
-High performance oversized double stitched foam (polymer infused) surround that sits one full inch tall; a stiff but light weight design.
-ss1000, satin Black (powder coated) Die-Cast Aluminum Alloy Rigid Frame, with six flared out vents surrounding the spider and coil (six forced-air vents that each flare out). These vents together provide open air of 33 squared inches.
-Each ss1000 subwoofer has a supporting top plate three quarters of an inch solid allowing for the "Ten's" open air design. Notice in the pictures, six (6) four inch long rails surrounding the basket. This creates additional rigidity.
-The ss1000 uses the same 3" coil as the 12" model, the ss2000. It makes a tight fit, but also an impressive ten inch subwoofer that gets low.
-One of Seven's parts manufacturers designed and introduced the "Neodymium Magnetically Powered Motors" into subwoofers. This company has been in business over 20 years.
-Another thing is art work! We have fun with art and creative photography involving our logo and our products.
-Why speakers? Why not... people are passionate about music. Without speakers we would have no music in our vehicles. That is unless Mozart was riding shotgun or having Alexander Graham Bell cranking on a sound machine in the back seat. These modern days, we as people, have become a little crazy with music. Not just the songs, but the speakers them selves have sort of come to life; capable of performing "hair tricks" and floating hats! It's fun...
Like small practical subwoofers? Neither do we... We have one however! Its the ss300 subwoofer (Six n' half inch Subwoofer by SEVEN):
fs/fms: 66.4hz
Qms: 5.93
Rms: 5.0 - kg/s
Nret: 0.15%
VAS: 2.3 L
RES: 69.2 ohm
Qes: 0.43
Cms: 0.08
BL: 16.6
Rp: 41.1 ohm
Le: 1.69 mH
Re: 4.0 ohm
Qts: 0.40
Mms 70.8gr
SPL: 83.9 dB
Lp: 28.5 mH
- Large (polymer infused) Foam Surround
- Push Terminals
- Watts: 300w RMS, 600w peak
- Size: 6.5inch, 10lbs
- Mounting depth: 4" (5" total sub height)
- High efficiency, Oz FEA optimized double stacked motor
- High performance dual voice coils (DVC) 2ohm (not 4)
- Dual Nomex Spider
- Recommended enclosure, .75sf
- XMAX: 11mm each way
For example, here are specs on the only TEN inch subwoofer we need, the ss1000 (Ten inch High Performance Subwoofer by SEVEN):
fs/fms: 31.6hz
Qms: 4.01
Rms: 12.7 - kg/s
Nret: 0.16%
VAS: 15.1 L
RES: 180.9 ohm
Qes: 0.28
Cms: 0.10
Rp: 54.0 ohm
Le: 2.98 mH
Re: 4.0 ohm
Qts: 0.26
Mms 256.5gr
SPL: 84.1 dB
Lp: 77.6 mH
- Over-sized (polymer infused) Foam Surround
- Push Terminals
- Watts: 1000w RMS, 2000w peak
- Size: 10inch, 35lbs
- Mounting depth: 6 3/4"minus (7 3/4 total sub height)
- High efficiency 180, Oz FEA optimized triple stacked motor
- 3inch, four layer, high performance dual voice coils (DVC) 2ohm
- Dual Nomex Spider
- Large terminals for big gauge wire
- Recommended enclosure, slot ported, 1.5sf
- XMAX: 28mm each way
Below are specs on the black twelve inch subwoofer, the ss2000 (Twelve inch High Performance Subwoofer by SEVEN, black basket):
- Over-sized (polymer infused) Foam Surround
- Push Terminals
- Watts: 2000w RMS, 4000w peak
- Size: 12inch, 48lbs
- Mounting depth: 8 5/8 without gasket/seal, 8 1/2" with it on (10" total sub height)
- High efficiency 300, Oz FEA optimized triple stacked motor
- 3inch, four layer, high performance dual voice coils (DVC) 2ohm
- Dual Nomex Spider
- Large terminals for big gauge wire
- Recommended enclosure, slot ported, 3sf (3.5sf if underpowered)
fs/fms: 36.1hz
Qms: 3.51
Rms: 18.6 - kg/s
Nret: 0.23%
VAS: 19.3 L
RES: 137.3ohm
Bt: 23.4 N/A
Qes: 0.48
Cms: 0.06
Rp: 35.5 ohm
Le: 1.62 mH
Re: 4.0 ohm
Qts: 0.42
Mms 266.1gr
SPL: 85.7 dB
Lp: 42.1 mH
Here ( --> ) are two proven enclosure design options for two Seven twelve's. The top one, non-slot port design, produces a 151.7db when built correctly and when given enough power. The 151.7 was done on a SoundQubed 6k amp, using two batteries and an upgraded alternator in a Jeep Grand Cherokee. He has taken home several trophies!
