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Model 109 Arbitrary Waveform and Pseudo-random Noise Generator
Especially designed for audio system testing. Produces white noise, pink noise, and an arbitrary waveform read from an EEPROM. Initially furnished with a "10-sine" waveform, the EEPROM can be quickly reprogrammed over an RS-232 link. With control software. Our WAVEMAKE (tm) software makes it easy to generate other waveforms.

Model 412 Audio Attenuator-Amplifier
A general purpose audio attenuator and amplifier in an easy-to-use instrument. Its features include 80 dB of attenuation in four decade steps plus fine attenuation in each step with a single-turn linear pot; 40 dB of gain in steps of X1, X10, X20, X50 and X100; wide bandwidth, low DC offset, and low harmonic distortion. It was developed to condition a computer's sound card output to drive other equipment but it is useful any time you need to attenuate or amplify an audio signal.

Model 414 Stereo Utility Amplifier
A general purpose audio amplifier designed for making audio measurements and to serve as a utility preamp. It has stereo inputs and stereo outputs as well as a mono output which is the sum of the stereo inputs. The mono output is in-phase with the stereo outputs. Its features include 26 dB of gain in steps of X1, X2, X5, X10 and X20; low-noise, wide bandwidth, low DC offset, and low harmonic distortion. It is power-mains operated and the cast aluminum enclosure minimizes the pickup of unwanted signals.

Model 439 Two-Channel Attenuator-Amplifier
A general purpose audio attenuator and amplifier in an easy-to-use instrument. Its features include a 118 dB range (-78 dB to +40 dB) in one dB steps as set by a rotary encoder with the gain settings displayed on a one line LCD. The channel gains may be set independently or together depending on the position of the SET GAIN switch. A power amplifier is included to drive a stereo headphone for audiometric testing or other use.

Model 601 Highpass/Lowpass Tunable Filter
Easily implements tunable highpass, lowpass and bandpass filters. The unit contains a tunable 8-pole Butterworth highpass filter and a tunable 8-pole Butterworth lowpass filter. Corner frequencies can range between 100 Hz and 40 kHz and can be set from the front panel or by a host PC computer over a serial link. The unit has an input analog lowpass filter, an output analog lowpass filter and a variable gain amplifier with gain steps of x1, 2, 3, 5 and 10. The controlling microprocessor is put in sleep mode when it's not programming the filter to eliminate its clock noise from the output.

The Sound Strobe^TM
This is NOT a TDL® product but we have found it useful so we are including it on our test equipment page. It's a small, portable instrument that produces six selectable spectrum shape pulse signals to help you identify problems with your speakers and their interactions with your listening room.