Those values produce a notch as found in the stock Condor.Īs the DPDT switch is activated, the 1n2 cap is added in parallel with the 1n, forming a 2n2 cap. The 6n8 and 8n2 caps are in parallel, which creates a total capacitance of 15n. When the 1n2 "bridge" cap switch is open and the 8n2 switch is closed.
By using a DPDT switch for the two single-pole switches, we can open a switch while closing the other. A 1n2 and 8n2, both with a single-pole switch in series, are placed in parallel with those caps, respectively. Best of all, a DPDT switch can be used to toggle between the two modes - or a 3PDT can be used to allow LED indicators for each response.Īs shown in the partial schematic below, the 1n "bridge" cap is unchanged while the stock 15n cap is changed to a 6n8. By adding and removing capacitors in parallel with the notch caps, we can produce a notch depth that approximates the notch produced by the Marshall speaker simulator. However, a compromise is available if we focus our efforts on the Marshall notch depth. While the above modifications will accurately reproduce the Marshall speaker simulator's response curve, so many components differ from the stock Condor that using a switch to toggle between the two is not feasible. The below graph compares the original Condor frequency response with the Marshall mods. Low-pass filters: replace the 3n9 caps with 4n7, and replace the four 22k resistors with 15k or 18k (16k is the nominal value, if you can get it otherwise use 15k for slight extra treble, or 18k for some less fizz). High-pass filter: replace the 18k and 100k resistors with 12k and 120k. Substitute the following components:īridged-T notch filter: replace the 1n and 15n caps with 2n2 and 6n8, respectively.
Condor cab simulator#
The Condor can be modified to reproduce the frequency response of the Marshall speaker simulator that is included on their amps with an XLR output (as traced by Ed Rembold, available at Aron's Selected Schematics). When those are present, the resulting sound can seem harsh and unrealistic - especially when using a distortion pedal. Note how the steeper roll-off of the Condor removes more high frequency content. For comparison, the Bulldog Cab Sim response curve is shown with a dotted red line. To cut more highs, increase them to 27k or more.Ī frequency response graph of the Condor is shown below. For more high frequency content, you can reduce the four 22k resistors to 18k or less. They simulate the steep high frequency rolloff of a guitar speaker, in addition to the peak near 3kHz. These are the two identical networks between second and fourth op-amp stages. For deeper bass, you can replace the two 47nF caps with 56nF or 68nF.
Condor cab plus#
It simulates the low frequency rolloff of the speaker cabinet, plus the 90Hz peak. This is the network between the first two op-amp stages. To reduce the notch depth, you can replace the 1n and 15n caps with 1n5 and 10n, or even 2n2 and 6n8, respectively. High frequencies are then 6dB above low frequencies, as shown in the speaker response curve. Please note that the extra resistor in parallel with the capacitor to ground is not only for biasing the op-amp, but it also produces a high-pass shelving effect. Produces the 400Hz notch found in the P10R response. We liked using a J201 best, but an MPF102 or 2N5457 will provide more treble-content and different overdrive characteristics. Also adds some overdrive at higher Gain settings, which emulates the behavior of a real speaker operating at high volume. Amplifies the signal to drive the filters. The circuit is composed of the following functional blocks: We chose to emulate a 4x10 cabinet, so low frequency response was shifted down slightly from the published curves to account for the larger cabinet and the combined cone area of four speakers. The starting point was the published response of a single 10 inch Jensen P10R speaker. Within the reach of do-it-yourself builders. Our goal was to design a speaker cabinet simulator suitable for direct recording and headphone playing, capable of outperforming existing designs, but still Typical DIY speaker cabinet simulator designs are simple builds, but often fall short of a convincing frequency response due to the oversimplified designs. This project is rated 2 out of 3 for the level of complexity. Professional-quality frequency response in a DIY-friendly circuit
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