Couch sub

[Jason Verbanac]

I have a 15 in nvx v3 I wanna build a box for under my couch. Yes I can raise it but only about a foot off the ground. How could I build a box that'll sound good without choking the poet hole

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[CarAudio.com - Hal AI Bots]

I have a 15 in nvx v3 I wanna build a box for under my couch. Yes I can raise it but only about a foot off the ground. How could I build a box that'll sound good without choking the poet hole

When building a subwoofer box for a 15-inch NVX V3 to fit under your couch, there are several factors to consider to ensure it sounds good without choking the port hole. Here’s a step-by-step guide to help you achieve optimal sound quality:

### 1. Calculate the Box Volume:
- For a 15-inch subwoofer, you typically want a box volume ranging from 3.0 to 5.0 cubic feet, depending on the subwoofer's specifications. Check the manufacturer's recommendations for the optimal volume range.

### 2. Determine Port Size and Type:
- Ported vs. Sealed: A ported box can get deeper bass but requires careful consideration of port size and length. A sealed box often sounds tighter but with less low-end extension.
- Port Area: The port should be large enough not to choke the airflow. You can calculate the necessary port area using the formula:
\[ \text{Area (in sq. inches)} = \frac{\text{Max Power (watts)}}{(60 \times \text{Maximum Port Velocity})} \]
Aim for a maximum port velocity of about 10-15 m/s.

### 3. Designing the Box:
- Dimensions: Design the box to fit under your couch, making sure the height is less than or equal to 12 inches.
- Construction: Use materials such as MDF (Medium Density Fiberboard), which is ¾ inch thick. It provides good sound quality and durability.

### 4. Port Tube Length:
- If using a round port, ensure it’s long enough (this depends on the internal box volume and tuning frequency). Use port calculators available online to determine the ideal length based on your chosen internal volume.

### 5. Placement:
- Ensure the subwoofer box is raised off the floor as much as possible (even if it's a foot) to optimize the sound produced. The placement will affect how the sound waves interact with the environment.

### 6. Sealing and Finishing:
- Ensure that all joints are sealed with wood glue and screws to prevent air leaks. This enhances sound quality. You can finish the box with acoustic damping material to reduce resonance and improve sound clarity.

### 7. Testing:
- Once built, test the box with different music genres. You may need to tweak the tuning by adjusting the port size or length for optimal performance.

### Conclusion:
With careful calculations, planning, and construction, you can build a subwoofer box that fits under your couch without choking the port. Focus on maintaining proper volume and port dimensions for the best sound.

Please feel free to ask any specific questions or share more details about your space so we can provide more tailored advice. I also encourage other members to chime in with their suggestions or experiences!

 

[Doxquzme Premium Member]

I'm not quite understanding the "raise it off the ground" part.

Is this the 15" in NVX v3 you're wanting to use?

https://www.sonicelectronix.com/item-46596-NVX-VCW152-Version-3-VCW152v3.html?utm_source=google&utm_medium=cpc&utm_campaign=PLA&utm_source=google&utm_medium=cpc&utm_campaignid=22383730556&utm_matchtype=&utm_keyword=&utm_device=c&utm_content=&utm_devicemodel=&utm_network=x&utm_loc_physical_ms=9029753&utm_loc_interest_ms=&utm_placement=&utm_adposition=&utm_ctype=&gad_source=1&gad_campaignid=22377339516&gclid=Cj0KCQjw7eXTBhDBARIsAKF-w44PgdIX-LOY2p8As-WyddRXB6HJhZF-mx82Y6ruzYniYDXAe2FNeuIaAtrHEALw_wcB

If that is the driver, you're looking at a fairly large ported enclosure of approximately 3-3.5 cu ft net. Here are some general enclosures you'll be looking at.

Keep in mind, this is for the box specifications, not what the end product has to be shaped like. As long as you keep the parameters (net cu ft, port area the same, then the overall shape is not all that important, within reason.

3.5 cu ft Net:

Box outer dimensions:	TBD
Material Thickness	0.75
Net Internal Volume	3.50 ft3
Tuning Frequency	29 Hz
Port Area	47.25 inch2 (2232 sq in)
Port Inlet Width x Height	TBD
Port Length	TBD

3 cu ft net:

Box External Dimensions Width x Height x Depth	TBD
Material Thickness	0.75"
Net Internal Volume	3.00 ft3
Tuning Frequency	29 Hz
Port Area	33.00 in2 (1089 sq in)
Port Inlet Width x Height	TBD
Port Length	TBD

Sealed, it behaves well in a 2-2.25 cu ft stuffed box, providing a 37- 42 Hz in-room response.

Port placement does matter, so I need to know: is the sub going to be part of a platform that you're wanting to put under it?