Short answer: the HSU Research VTF-3 MK5 HP, if you are buying new. The JBL 4645C ranks higher than it (#25 vs #59 of 143 subwoofers, 4.4/5 vs 4.2/5) but is discontinued, so only consider it used; the HSU Research VTF-3 MK5 HP is still sold new at $1,049.
The case for the HSU Research VTF-3 MK5 HP: A 15 inch ported subwoofer with excellent output for the money, a strong value pick for movies and music. The tradeoff: Ported design requires careful room placement, mid-size 86 lbs (39 kg) cabinet, and mid-range output.
The case for the JBL 4645C: A pro cinema 18 inch ported subwoofer with very strong upper bass punch, suited to adding impact in a modest room. The tradeoff: Deep-bass output is limited relative to its midbass result, so it is not the right choice for the lowest movie effects.
Buy the HSU Research VTF-3 MK5 HP, since the JBL 4645C is discontinued and only worth hunting down used.
Still deciding? The full Subwoofers rankings cover every ranked option.
A 15 inch ported subwoofer with excellent output for the money, a strong value pick for movies and music.
Prices on this page were last checked October 29, 2026 at 4:42 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| HSU Research VTF-3 MK5 HP | JBL 4645C | |
|---|---|---|
| Price | $1,049.00 | $4,999 Passive, Discontinued |
| Ranked | #59 of 143 in Large Home Subwoofers (Over 75 lbs) | #25 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, front |
| Output SPL at 15 Hz | 100.8 dB | - |
| Output SPL at 20 Hz | 108.2 dB | 98.9 dB |
| Output SPL at 25 Hz | 113.4 dB | 114.0 dB |
| Output SPL at 31.5 Hz | 118.2 dB | 118.7 dB |
| Output SPL at 40 Hz | 121.9 dB | 122.0 dB |
| Output SPL at 50 Hz | 122.3 dB | 123.7 dB |
| Output SPL at 63 Hz | 121.1 dB | 129.7 dB |
| Output SPL at 80 Hz | 120.4 dB | 133.9 dB |
| CEA-2010-A Average (40-80Hz) | 121.4 dB | 127.3 dB |
| Dimensions | 25”H x 17.2”W x 24”D (635.0 x 438.1 x 609.6 mm) | 39.7”H x 26.5”W x 17.7”D (1009.6 x 673.1 x 450.8 mm) |
| Weight | 85.1 lbs (38.6 kg) | 138 lbs (62.6 kg) |
| Warranty | 7/2(+3) | 5/3/2 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Manufacturer | Data-bass |
| Drivers | 15” (381mm) driver | 18” (457mm) driver |
| Passive | - | Yes |
| Output SPL at 100 Hz | - | 135.1 dB |
| Output SPL at 125 Hz | - | 135.8 dB |
Related Speaker Comparisons
How JBL 4645C compares with other leading options: