HYDRO-8 300 Watts RMS 8 Inch Shallow-Mount Subwoofer
5Best price now
Compared across 2 stores. Prices are checked against each store and labelled with when.
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Quick answers
- Where is the HYDRO-8 300 Watts RMS 8 Inch Shallow-Mount Subwoofer cheapest?
- At eBay, for $89.99, as of our latest check.
- What do buyers say about the HYDRO-8 300 Watts RMS 8 Inch Shallow-Mount Subwoofer?
- Rated 5 out of 5 from 7 ratings. Buyers like: Higher quality than expected for the price; Works flawlessly; Small but packs a punch. Common complaints: Lacking clearness in bass quality at higher volumes.
- Where can I buy the HYDRO-8 300 Watts RMS 8 Inch Shallow-Mount Subwoofer?
- 4 stores we checked sell it, including CT Sounds, eBay, CT SOUNDS, Amazon.
HYDRO-8 300 Watts RMS 8 Inch Shallow-Mount Subwoofer prices at every store
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- CT SoundsNew
In stock
$89.99Observed Nov 1, 2026, 6:15 PM - eBayNew
In stockSold by ct-sounds
$89.99Observed Nov 1, 2026, 6:15 PM
Also available at
- CT SOUNDSCheck price at CT SOUNDS
- AmazonCheck price at Amazon
HYDRO-8 300 Watts RMS 8 Inch Shallow-Mount Subwoofer price history
Lowest price we've seen: $89.99 on Oct 30 at CT Sounds. Tracked across 3 stores since Oct 30.
From CT SOUNDS
- 300 Watts RMS, 600 Watts MAX power handling
- 8-inch shallow-mount subwoofer with mounting depth of 3.26 inches
- Suitable for both sealed and ported enclosures
- Custom-tooled basket keeps mounting depth below 3.5 inches
- Custom-tooled cone maximizes excursion capability
- Dual white stitched competition mega foam surround
- Sizes
- DUAL 2 OHM, DUAL 4 OHM
- Materials
- Composite paper cone with 3% carbon fiber reinforcement; dual white stitched competition mega foam surround; poly-cotton blend spider; Y35 magnet; low carbon ir
- Shipping
- Orders before 4 PM CST ship same day; free shipping
About the HYDRO-8 300 Watts RMS 8 Inch Shallow-Mount Subwoofer
Details
CT Sounds is proud to introduce the hydro shallow mount subwoofer series after completing a rigorous R&D process spanning 2 years! Our goal was to engineer a 300-watt 8” shallow-mount subwoofer with a mounting depth below 3.5” that was suitable for both sealed & ported enclosures. To achieve this, we focused on the EBP (Efficiency Bandwidth Product). As a general rule, EBP < 50, is used only for sealed enclosures, EBP 50 - 100, is used for both, and EBP > 100, is used only for ported enclosures. EBP = FS/QES.
Quick Facts:
RMS Power:
300 Watts
MAX Power:
600 Watts
Voice Coil Configuration:
Dual 2 Ohm
Use Cases:
Sealed & Ported Enclosures
Our 1st prototype utilized a 50.8 mm voice coil & 30 oz magnet resulting in a high QES rating of 1.05 and low EBP of 44.1. The 2nd prototype utilized a 44.7 mm voice coil & 30 oz magnet resulting in a slightly lower QES rating of 0.843 and a slightly higher EBP of 54.8. After the 1st and 2nd prototypes, we determined a larger motor assembly was needed to provide a more controlled electrical system (lower QES). This led us to invest in a custom-tooled basket (used in the final prototype) to keep the mounting depth below 3.5”.
The 3rd and final prototype uses a 44.7 mm voice coil & 40 oz magnet resulting in a reduced QES rating of 0.577 and a balanced EBP of 80.07. In testing, we ran into mechanical noise due to the larger motor assembly and voice coil in a confined space. Therefore, we invested in a custom-tooled cone to maximize the excursion capability by creating an equal distance between the cone, spider, and bottom plate. The result is an 8” shallow-mount subwoofer that is extremely responsive in both sealed & ported enclosures.
