PASpeaker-Base
12″ Bass reflex 2-way

Eminence Delta 12A Trap

Trapezoidal 12″ 2-way top from Eminence with Delta 12A and N151M-8 – DIY crossover or ready-made crossover, target values, simulation and measurement.

Partially verified Last checked: 13 September 2026 What does this mean?

Primary source checked; some values are missing from the source or still open.

Compare with other plans

Share via …

Specifications

Link to section “Specifications”

Every value with its provenance. If a value is missing from the source, it reads “not available”.

Drivers
1 × Eminence Delta 12A, 1 × Eminence N151M-8 Manufacturer
Enclosure type
Bass reflex
Low-frequency extension
70 Hz (-3 dB) · 44 Hz (-10 dB) design goal Manufacturer
Sensitivity
not available
Max. SPL
124 dB design goal · 121 dB design goal Manufacturer
Power handling
400 W Mechanically limited power · 250 W Mechanically limited power Manufacturer
Impedance
not available
Dimensions (H × W × D)
not available
Volume
not available
Tuning frequency
not available
Weight
not available
Recommended high-pass
not available

External dimensions are not given directly. According to the build instructions: side panels 27″ × 12″, baffle 27″ × 14 ¾″ (p. 6).

Description

Link to section “Description”

In brief

A compact trapezoidal top with a 12-inch woofer and a compression driver on a horn. Eminence supplies crossover values, design targets and simulated and measured curves.

The Delta 12A Trap is a trapezoidal 2-way top from the Eminence Custom Shop. It combines the 12-inch woofer Delta 12A with the compression driver N151M-8 on the H290S horn “or equivalent”. A pole-mount socket is provided for use on a stand.

There are two options for the crossover. You either build it yourself from the component values in the instructions or use the ready-made Eminence PXB2:1K6 crossover with the PX-LPAD level control. Two ports made from 3-inch PVC pipe sit at the bottom of the baffle.

According to Eminence, the power handling of 400 W applies only from 100 Hz upwards; in full-range operation, excursion limits it to 250 W. A high-pass is therefore advisable, ideally together with a subwoofer.

The instructions use US units (inches) and list sources with part numbers from a US dealer. To build it in Europe, dimensions have to be converted and parts replaced.

Drivers

Link to section “Drivers”

  • Eminence H290S

    Horn · “or equivalent” according to the instructions

    Original driver

  • Eminence PXB2:1K6 with PX-LPAD

    Crossover · Ready-made crossover with level control instead of DIY

    Alternative named by the manufacturer

Enclosure

Link to section “Enclosure”
Enclosure type
Bass reflex · How does it work?
Shape
Trapezoid
Ports
  • 2 × round port3″ PVC tube (Schedule 40), hole 3 ½″; position 3 ½″ above the bottom edge, 4″ from the side
Material
  • Plywood (wood type not stated), 19 mm – specified: ¾″ plywood, preferably birch according to the instructions

Build plan

Link to section “Build plan”

We link to the original plan and do not host other people’s drawings.

  • Delta 12A Trap – Bauanleitung (PDF, englisch)

    Official source · 28 pages · version Ver. 1.0 · accessed on 13 September 2026

    Published by the manufacturer

    Open original document
    Checksum (SHA-256)f1b510bed5815870c9e1e08b0449cc620cd3dc6720988f64f57850d6d11dac41

Plan access: Free

Measurements

Link to section “Measurements”

Measurements with their conditions. The curves themselves are in the original document.

  • Measured · Manufacturer limited comparability

    Frequency response

    Frequency response at 2.83 V / 1 m and impedance response as a graph. Measurement environment and smoothing not stated.

    Environment
    not stated
    Distance
    not stated
    Normalisation
    2,83 V / 1 m
    Smoothing
    not stated

    Location in source: PDF p. 3 · Delta 12A Trap (build plan PDF, Ver. 1.0)

Simulation

Link to section “Simulation”

Simulations show the theoretical behaviour – they do not replace a measurement.

  • Simulated · Manufacturer

    Eminence Designer

    Predicted curves from Eminence Designer (version not stated).

    Inputs
    Results

    Location in source: PDF p. 1–2

Crossover & controller

Link to section “Crossover & controller”
Crossover
DIY crossover with component values in the original document or the ready-made Eminence PXB2:1K6 crossover. Crossover frequency not stated explicitly.
Recommended high-pass
not stated

Pros and cons

Link to section “Pros and cons”

Pros

  • Crossover can be built yourself or bought ready-made
  • Target values, simulation and measurement documented separately
  • Pole-mount flange provided

Cons

  • Only 250 W mechanical in full-range operation
  • US units and US suppliers

Sources

Link to section “Sources”
  1. Tier A · primary source

    Delta 12A Trap (build plan PDF, Ver. 1.0)

    Eminence Speaker, LLC · 7 November 2022 (Date from file metadata) · accessed on 13 September 2026

    US units; suppliers with part numbers from a US retailer. The file URL contains a version parameter and may change with updates.

  2. Tier A · primary source

    Eminence DIY Speaker Plans

    Eminence Speaker, LLC · 7 November 2022 · accessed on 13 September 2026

Usage rights of the plan: Published by the manufacturer. Added on 13 September 2026, last updated on 13 September 2026.

Further reading

Link to section “Further reading”