David PAL Light and Sound Machine

Light and Sound Machines are a non-pharmaceutical approach to assist in reducing and relieving the symptoms of Stress and Anxiety, Post Traumatic Stress Disorder (PTSD), Attention Deficit Disorder (ADD), Pre-Menstrual Syndrome (PMS), Chronic Fatigue Syndrome (CFS), Seasonal Affective Disorder (SAD), Depression, Insomnia, Autism, Chronic Pain and Fibromyalgia.
They are often used to improve academic and sports performances.  Using flashes of lights and pulses of tones, we can gently and safely guide the brain into various brain wave patterns.

This model has been discontinued and has been replaced with the David Delight


David PalMeet your latest PAL. That's what we've named our latest addition to the DAVID family, the DAVID PALTM (Portable And Lightweight). We're very excited about our latest creation with our newest and best preset sessions programmed into it and it's half the size of our other audio-visual entrainment models. It even has heart rate variability (HRV) to help you breathe as well as a meditator can.

The DAVID PALTM is an extremely portable audio-visual entrainment device. This is the one that will fit in your shirt or jacket pocket (approximate dimensions - 2.5 x 1 x 3.5 inches / 7 x 2.5 x 9cm ) and will allow you to experience audio-visual entrainment wherever you go. Perfect for people who are on the go.


One of the special and unique features of the DAVID PALTM is that it has charging capabilities. The DAVID PALTM can charge rechargeable batteries and even your alkaline batteries when you're not using the DAVID PALTM. You just simply set the ON/OFF/CHARGE switch to charge mode to recharge your batteries.


To ensure safe, gentle and effective audio-visual entrainment, the DAVID PALTM offers the following:

  • Tru-Vu OmniscreenTM Eyesets - Our unique Tru-Vu OmniscreenTM eyesets were carefully designed to provide you with the most effective and safe light and sound experience. The Tru-Vu OmniscreenTM eyesets use eight high efficiency white bulbs mounted over a silver reflector behind a light blue-tinted translucent screen. This disperses the light evenly, protects the bulbs and removes any red light which may be produced by the bulbs. White light has proven most effective in imagery, relaxation and visualization. Our new Tru-Vu OmniscreenTM eyesets are specially designed to allow for the left and right visual fields of each eye to be individually stimulated rather than the entire eye. With the Tru-Vu OmniscreenTM eyesets, the lights flash into the left visual fields of both eyes, then alternately flashes into the right visual fields of both eyes. This approach allows the ability to stimulate either visual cortex with a frequency different from the other visual cortex. For example, a person who functions strongly from the left brain could have 8 Hz stimlulated into the right visual field (and therefore the left brain) to slow down left brain function and have 18 Hz stimulated into the left visual field to increase right brain function.

  • Independent Left & Right Volume Control - The DAVID PALTM has independent left and right volume control dials. This feature is especially useful for anyone who has inbalanced hearing capabilities and hearing loss.
  • Isochronic Pulsed Tones - The tones of the DAVID PALTM are evenly spaced, are of equal pitch and are turned on and off at a specified rate. This is important to enhance the effectiveness of audio entrainment.
  • Soft-OffTM - The gradual lowering of the light stimulation at the end of the session prevents a startle response (also known as somnatic shock). Soft-OffTM ensures that relaxation and other benefits carry over even after a session.
  • Easy-To-Find Intensity and Select Buttons - Both the select button and the intensity button are raised so that you can make the necessary adjustments easily and quickly. Adjust the intensity of the Omniscreen eyeset with the easy-to-find INT button. Simply press the SEL button to select which preset sesssion you wish to run.
  • 18 Preset Sessions - Including Brain Brightner (for ADD and cognition), Fractioned Hypnosis, Alpha/Beta Mix (for depression), Schumann with Dissociation & HRV (for meditation), Beta Perker, Theta with Dissociation (for sleeping), and Music Modulation (to turn your music into an intriguing light show).


  • David PalTru-Vu OmniscreenTM Eyesets
  • Quality Stereo Headphones
  • Stereo Patch Cord
  • DAVID Carry Bag
  • 9-Volt Alkaline Battery
  • Comprehensive Operator's Manual
  • DAVID User's Guide Manual David Pal Manual 


For the first time, a system exists where meditative breathing may be paced along with an audio-visual entrainment (AVE) session. This technique has been borrowed from our clinical model, the DAVID Paradise XLTM. Long, graceful breathing cycles have been used as part of meditation. Scientifically, this technique has been analysed and shown to settle down a stressed autonomic nervous system. Both sympathetic (flight-or-fight) activity and para-sympathetic (the brain's efforts to compensate) activity settle down dramatically using HRV techniques.

The heart speeds up with every breath in and slows down with every breath out. This swing in heart rate is HRV. A typical heart beat swing is in the order of about 15 beats per minute (pbm). When people get stressed, the heart typically clamps to sometimes as low as five bpm HRV at times intermixed with sharp spikes in heart rate. This is all abnormal activity and is rough on the heart.

The HRV technique used clinically is based on a 10 second breathing cycle (six breaths/minute, by inhaling slowly for five seconds and exhaling slowly for five seconds in an easy, relaxed breath). When using HRV paced breathing, listen to the heartbeat generated by the DAVID PALTM through the headphones. Inhale for two heartbeats and exhale for two heartbeats (not your own heartbeats!). Most sessions begin at seven breathing cycles/minute (28 heartbeats/min) and slow to six breaths /minute (24 heartbeats/min). This allows the user to breathe a little faster at the onset of a session until he/she has had time to relax.


David Session Editor

Designed for the DAVID PAL, PAL36 and PAL36 with CES, the DAVID Session Editor is graphics software that allows for any type of session to be designed and downloaded into your PAL.

It provides programmability for all functions such as: rates, volume, intensity, tones, number of replays, etc. It includes a complete library of preset sessions to use as templates to help you design your own sessions. The library also includes an "erase all" PAL wave file - for any clinician to install a "prescription" of only the sessions that the clinician wants the client to use.

Clinicians can also set the number of times a session can be played. After all of the sessions have been played, the client would need to return to the clinician for a "refill". This allows the clinician to closely monitor which sessions are being used and how often they are being used.

This model has been discontinued and has been replaced with the David Delight


Delivery by courier Mon-Fri, in stock NOW

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