Horn type
Offset-driver horn
One face of the diaphragm enters the horn partway along, rather than at the throat. The section of path behind the entry is closed, and it works as a side branch that cancels a band of frequencies you choose.
How it connects
The path starts at a closed end. The front of the cone enters at the driver entry position; the back of the cone loads the rear chamber.
The closed section between the end and the entry puts a notch in the response. Designers use it to cancel an unwanted peak above the working band.
When to use it
Good for
- Front-loaded designs whose first upper peak needs taming without stuffing.
- Subwoofer horns that would otherwise have a strong resonance just above the band.
Watch for
- The further the entry sits from the closed end, the lower the notch. Move it too far and the notch lands inside the working band.
- With the rear chamber at 0 L, the back of the cone radiates directly and shows as a Direct radiator output.
What you set
Set the enclosure type to Horn, then choose Offset-driver under Horn type, in the enclosure panel or in the Horn Editor’s path bar. These controls then appear in the horn card:
| Control | What it sets |
|---|---|
| Driver entry position | A percentage of the path, measured from the closed end. Switching to this type from a horn with the entry at 0 % sets it to 20 %. |
| Throat chamber | Volume and Cross-section. |
| Rear chamber | Loading: Sealed or Port, and Volume. At 0 L the back of the cone radiates directly. |
| Main horn | Throat diameter, then up to eight spans, each with a flare, Length and End Ø. |
The driver marker can be dragged along the path. The drawing starts at the closed end. How the Horn Editor works.
What the driver entry position does
Only the driver entry moves. Near the closed end there is no notch below 500 Hz. Further along, a deep notch appears and moves down as the closed section grows, while the bottom of the band extends a little.
- 10 % · 12 cm−3 dB 100 Hz
- 20 % · 24 cm−3 dB 91 Hz
- 35 % · 42 cm−3 dB 85 Hz
Diagnostics and stuffing
The one horn output is the Main mouth. The Rear port appears when the rear chamber is ported, and a Direct radiator when it is 0 L. Locations include the closed end and both sides of the entry point. Reading the horn diagnostics.
Any span of the horn can be stuffed, including the closed section behind the entry. How stuffing works.
Folding and Hornresp
- Folding
- Available. The Fold tile keeps the closed end capped. Its Driver entry chip shows where the driver lands on the folded path, and its Hornresp tab gives OD, OD1 or OD2 values and the rear chamber volume.
- Hornresp export · OD, OD1 or OD2
- The driver must enter at S2, S3 or S4. A ported rear chamber is written as Rear Vented, a mapping that has not yet been checked against a native Hornresp capture.
- Checked against Hornresp
- 16 native Hornresp cases of this type are re-simulated in the regression tests. 13 of 13 agreement checks meet their tolerances, and 3 more track stuffing-model differences without claiming agreement.
Folding a horn into a cabinet · Exporting to Hornresp
Try it
There is no example for this type yet. Open the simulator, add an enclosure, set its type to Horn and choose Offset-driver under Horn type. It starts from the default horn path.
Ask your AI
Hand it to your AI
With 00 Simulator connected to Claude, ChatGPT or another MCP client, your assistant runs this same solver on your own workspaces. Copy the prompt and paste it into a chat.
Using 00 Simulator, add an offset-driver horn to my open workspace for the driver I am using now, with a 15 L sealed rear chamber. Try driver entry positions of 10 %, 20 % and 35 % without saving, simulate each at 50 W and show me where the notch lands.
- Claude
- In a chat, open the + menu, go to Connectors and switch 00 Simulator on.
- ChatGPT
- In a chat, open the + menu, choose Developer mode and select 00 Simulator.
- Claude Code
- Once the server is added, paste it into any session.