Spectral Characteristics of Air and Bone Conduction Transducers used to Record the Auditory Brain Stem Response

Is this a better way to deliver music to you post-stroke? It also delivers mini vibrations, is that useful for your recovery? What does your doctor have to say? You'll have to ask you doctor what improvements have occurred in this field since 1985.
To help your doctor out there is this research;

Study Shows That Vibroacoustic Therapy is More Than Just Noise

http://journals.lww.com/ear-hearing/Abstract/1985/09000/Spectral_Characteristics_of_Air_and_Bone.11.aspx

Schwartz, Daniel M.; Larson, Vernon D.; De Chicchis, Albert R.

Abstract

This study sought to determine differences in the acoustic spectra of five different transducers commonly used for stimulus presentation to record the auditory brain stem response (ABR). The outputs of three commercially available bone conduction vibrators (Radioear B-70A, 8-71 and B-72), a TDH-49 earphone, and an insert receiver were measured by applying a 0.1 msec rectangular electrical pulse to each transducer. The resultant output for each transducer was converted to one-third octave band data and plotted against reference threshold levels. Results demonstrated relatively flat acoustic spectra and high output levels for the two air conduction receivers. In contrast, each of the bone oscillators had its greatest concentration of energy in the 2000 Hz region with the spectrum characterized by a precipitous decrease in output at frequencies above and below this resonance peak. Maximum output never exceeded 35 dB HL for any of the three bone conduction devices. Of the three oscillators, however, the B-70A appeared to provide the highest output before reaching saturation. Results are discussed relative to the limitations for recording the auditory brain stem response to bone conducted transient signals.

A current sample of what is available today;

https://www.touchofmodern.com/sales/aftershokz-0b8524a9-849c-449f-878e-11a32543364e/bluez-2 

Study Shows That Vibroacoustic Therapy is More Than Just Noise

Hey if it works for Parkinsons get that clinical trial going for stroke.
http://www.medgadget.com/2012/05/study-shows-that-vibroacoustic-therapy-is-more-than-just-noise.html
According to a study from the University of Toronto in Canada, research suggests that Vibroacoustic Therapy (VAT), which uses vibrations produced by low frequency sounds to “massage” deep parts of the body, could help patients with neurological diseases such as Parkinson’s. The study involved two groups of 20 Parkinson’s patients being treated with five minutes of 30 Hz vibrations. Results showed marked improvement of all symptoms in both groups, including less rigidity, better walking speed, and less tremor. Before you decide to crank up the volume on your speakers and park yourself on your subwoofer, however, keep in mind that the VAT was administered using special transducers that convert the sound to inner body massage. It’s thought that brain waves at a frequency of 40 Hz are the carriers of information that control movement; the transducers are fine tuned to produce vibrations between 20 and 100 Hz, which are almost too low to hear audibly, but whose vibrations can add stimulation to brainwaves.
In addition to affecting the brain, VAT also provides deep physical cellular stimulation to skin, muscles and joints, much like vibrating muscle massagers, but deeper acting. As such, researchers have observed decreased pain and increased mobility when VAT is applied to the rest of the body.

More at link.