Voice Amp

SpeechEasy

Fluency Master

DAF
30-200 ms
User-adjustable
                                

0-500 ms

DAF
up to 220 ms
Not user-adjustable

No

FAF
octave scale
pitch-shifting
+0.4 to -1.2 octaves

FAF
octave scale
pitch-shifting
+0.8 to -1.2 octaves (six settings)

FAF
octave scale
pitch-shifting
-0.4, -0.8 octaves (two settings)

No

FAF frequency-shifting
0-2000 Hz

FAF frequency-shifting
500, 1000, or 2000 Hz

No

MAF
110 Hz sine wave
manual button

No

No

No

Gated pink noise masking

No

No

Biofeedback Features

Analyzes vocal frequency and amplitude. Audio and visual display.

No

No

No

No

Binaural or Monaural

Binaural (two ears) or monaural (one ear)

Binaural (two ears) or monaural (one ear)

Monaural

Monaural

Effectiveness

More than a dozen studies published in scientific journals. 60-80% immediate stuttering reduction, including stressful situations such as telephone calls to local businesses. Two long-term studies found 55% carryover fluency: after three months using devices 30 minutes per day; and one year after therapy with the device ended.

"40-85% reduction in stammering during oral reading" 2 clinical trials presented at conferences (none published).

Two published long-term studies. First study found SpeechEasy reduced stuttering 70% for reading aloud and monologue in a speech clinic, effect didn't diminish over 12 months, and no carryover fluency. Second study, over four months, found no statistically significant reduction in stuttering in reading aloud, conversations, or asking strangers questions.

One published study. Results were 14% reduction in stuttering during conversations.

Frequency Range

35-6000 Hz (human voices are in the 80 Hz to 1100 Hz range)

 

200-8000 Hz

 

Filtering of ambient noise via an adjustable 'Noise Gate', Dynamic Speech Band Compression, Reprogrammable Filter settings.

 

Telephone Features

Plugs into telephones. User hears callers voice and DAF/FAF
in both ears. Caller hears the user's unaltered voice.

No

Optional Telephone Assistive Device Dock

No

No

No

Bluetooth included

Bluetooth optional

No

Tele-coil transmitter

No

No

Size

4.5" x 2.7" x 0.9"
(11.5 x 7 x 2 cm)

3" x 2.25" x 0.75"
(7.5 x 6 x 1.75 cm)

4.3" x 2.5" x 0.85"
(11 x 6 x 2 cm)

3.8" x 2.25" x 0.63" (97 x 57 x 16mm)

Hearing aid-style

Hearing aid-style

Weight

5.1 ounces
(145 grams)

2.8 ounces
(80 grams)

4.3 ounces
(122 grams)

2.8 ounces
(79 grams)

Color

Black

Gray

Black

Beige

Power

9-volt alkaline lasts about 25 hours. AC adapter doesn't charge battery.

Battery lasts about 18 hours. Recharges like a cellphone.

9-volt alkaline lasts about 25 hours. AC adapter doesn't charge battery.

Battery lasts about 14 hours. Recharges like a cellphone.

Battery

Battery

Jacks

Two 3.5mm headset jacks (microphone, headphones)
One 2.5mm standard cellphone earset jack

2.5mm Nokia (non-standard) cellphone earset jack

Control Panel Software, Calibration Wizard tool, USB cable & USB charging, Pouch, Miniature headset & interchangeable buds, Charger

Best for

Speech clinics; individual consumers; silent blocks.

Individual consumers; noisy environments.

Individual consumers.

Schools and speech clinics; home practice for children.

Improves clarity and analyzes volume

Improves clarity

Improves clarity

No

Price

US$3495

US$2495

US$1495

 

US$1499

US$4100-4900; ask if there are additional fees

US$3500
ask if there are additional fees

60 days, 100% moneyback from speech clinics (speech clinic fees, if any, are not refundable); 30 days, 90% moneyback on direct (mail order) sales

60 days, 90% moneyback; ask if additional fees (if any) are refundable

One year no-fault warranty on repairs. All repairs covered regardless
of the reason the device broke or whose fault it was.

Ask whether the warranty covers accidental breakage or only factory defects.