CT-400.1D Monoblock Car Amplifier vs SLAPZ Audio SCD2K.1 Mono Block Amplifier
Buy the SLAPZ SCD2K.1 if you need real subwoofer power: 2,000W RMS at 1 ohm, 1,200W at 2 ohms and 800W at 4 ohms, plus a clip indicator for safe tuning. Buy the CT Sounds CT-400.1D if you run a single small sub and want the lowest cost: 400W RMS at 1 ohm in a tiny chassis that fits almost anywhere. The CT-400.1D has sold as low as $119.99 (October 31, 2026) against a high of $188.84 (October 28, 2026); the SLAPZ has held at $159.99 since October 28, 2026.
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CT-400.1D Monoblock Car Amplifier
5Choose the CT-400.1D if you have one modest subwoofer, limited mounting space and a tight budget.
- 400W RMS at 1 ohm is enough for a single small sub.
- Compact Class D chassis fits in tight installs.
- Strappable for a two-amp setup.
- Remote bass knob included.
- Sold as low as $119.99 on October 31, 2026.
- Only 150W RMS at 4 ohms.
- No clip indicator for tuning.
- Buyers call the bass knob poor quality.
- Not built for high-power sub stages.
What separates them
| CT-400.1D Monoblock Car Amplifier | SLAPZ Audio SCD2K.1 Mono Block Amplifier | |
|---|---|---|
| RMS power at 1 ohm | 400W x 1 | 2,000W x 1 |
| RMS power at 2 ohms | 300W x 1 | 1,200W x 1 |
| RMS power at 4 ohms | 150W x 1 | 800W x 1 |
| Strapping | Strappable, signal output is master | Cannot be strapped |
| Power and speaker terminals | Standard chassis terminals | 0-gauge inputs, dual 8-gauge speaker outputs |
| Tuning indicators | Protection circuitry only, no clip light | Clip and protection indicator on the chassis |
| Filters | Low pass, subsonic, bass boost | HPF 10-80Hz, LPF 80Hz-15kHz, bass boost 0-10dB |
Price history
- CT-400.1D Monoblock Car Amplifier: lowest $119.99 on Oct 31 at Amazon; $119.99 on Nov 2.
- SLAPZ Audio SCD2K.1 Mono Block Amplifier: lowest $159.99 on Oct 28 at SLAPZ car audio; $159.99 on Oct 31.
Prices at every store
CT-400.1D Monoblock Car Amplifier
- CT SoundsCheck price at CT Sounds
- CT SOUNDSCheck price at CT SOUNDS
- AmazonCheck price at Amazon
SLAPZ Audio SCD2K.1 Mono Block Amplifier
- SLAPZ car audioCheck price at SLAPZ car audio
- SLAPZ car audioCheck price at SLAPZ car audio
Specs compared
| Spec | CT-400.1D Monoblock Car Amplifier | SLAPZ Audio SCD2K.1 Mono Block Amplifier |
|---|---|---|
| Number Of Channels | 1 | Mono |
| RMS Power Rating | 350 watts RMS | 800 W (at 4 ohm) |
| Voltage | 14.4 volts | — |
| Maximum Supply Voltage | 14.4 voltsofdirect_current | — |
| Minimum Supply Voltage | 8.8 voltsofdirect_current | — |
| Mounting Type | Surface Mount | — |
| Maximum Output Power | 400 watts | — |
| Specification Met | CE, CSA, FCC, RoHS, WEEE | — |
| Unit Count | 1 Count | — |
| Class | Class D |
What reviewers say
CT-400.1D Monoblock Car Amplifier
Rated 5 out of 5 from 24 ratings. Owners say it handles a 1-ohm load without trouble, is easy to dial in, and puts out surprising power for its size. The remote bass knob is the main complaint.
- Runs a 1-ohm final load with no issues
- Filters and controls are easy to set
- Very powerful for its size
- Good value and solid build
- Bass knob feels cheap
SLAPZ Audio SCD2K.1 Mono Block Amplifier
Reception is thin: 13 ratings average 4.9 out of 5, which suggests buyers are satisfied but gives little detail on long-term reliability. No substantial owner commentary is available beyond the star scores.
- High power for the price
- Bass knob and clip indicator are useful
Questions and answers
- Which amp is better for a single 12-inch sub?
- Match the amp to the sub's RMS rating. A 400W sub suits the CT-400.1D at 1 ohm; a 1,000W or 2,000W sub needs the SLAPZ SCD2K.1.
- Is the SLAPZ worth the extra money?
- Yes if you need the power. At $159.99 it delivers roughly five times the 1-ohm output of the CT-400.1D, which has sold between $119.99 and $188.84.
- Can I strap two of these amps together?
- Only the CT-400.1D can be strapped; its signal output is master. The SLAPZ SCD2K.1 cannot be strapped.
- Which one is easier to tune?
- The SLAPZ, because its clip indicator shows when the signal distorts. The CT-400.1D has no clip light, so you tune by ear or with a scope.
- Will the SLAPZ fit my wiring?
- It takes 0-gauge power and ground inputs and dual 8-gauge speaker outputs, and draws up to 200A. The CT-400.1D uses standard smaller terminals.
- Which lasts longer?
- Both are Class D with protection circuits. The SLAPZ adds a clip light that helps prevent the burnt-board failures its warranty excludes; the CT-400.1D covers high/low voltage, over-current and over-temperature.
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