• r27a two-channel diagnostic audiometer
• DD45 headphones
• B71 bone vibrator
• Power supply
• USB drive containing
  • certificates and technical documents
  • installer file for MDS Resonance Database Management Software
  • user manual
  • tutorial and procedures
• Medical power supply with 4 plug adapters (including standard AC plug adapter for U.S.)
• Operator headset with microphone
• Patient talk-back microphone
• Patient response switch
• Dust cover

• DD45 Headphones for r27a, 2 x 6.3mm jack (item #8010954)

Is there a guide outlining front panel controls and/or how things plug into the back of the unit?

Click Controls & Components tab in the product description; the information is also outlined on pages 34-35 of the user manual (see Product Docs tab, and click User Manual icon).

CONTROLS AND COMPONENTS (FRONT SECTION)

1. Display

2. Built-in thermal printer compartment (obsolete; this audiometer requires external printer)

3. microphone (talk forward)

4. Channel 1 & 2 dials

5. F1 - F6 function keys 

6. Test key: when in testing mode, this key returns to main menu

7. Enter key: when in test mode, key for accessing tests from main menu

8. Right vs left ear inputs

9. Output/input for each channel

10.  Arrow keys: to navigate menus

11. Norm/Rev: for signal transmission.  Norm mode (output signal present when pressing SIGNAL button); rev mode (output signal constant and stopped when pressing SIGNAL button)

12. Signal: when audiometer in Norm mode, press button to present signal; in rev mode, press button to stop signal

13. Frequency

14. Controls: provides access to external signal adjustment and calibration page, for monitor-headset, for patient-to-operator mic (talk back), and for operator-to-patient mic (talk forward)

15. T over: talk forward microphone volume

16. Star/Stop: enables start/stop of special features/tests (auto threshold, SISI, Tone Decay, Bekesy)

17. Store: storage/display of threshold values

18. Print: prints test results to printer or to generate PDF report

CONTROLS AND COMPONENTS (BACK SECTION)

19. right (red) and left (blue) standard headphones (DD45)

20. high frequency headphones (DD450)

21. sound masking 

22. B71 bone vibrator

23. free field

24. external cd player

25. talk back microphone

26. talk forward operator microphone

27. operator monitor headset

28. patient response button

29. second patient response button (note: obsolete)

30. SD card (speech test materials packaged with device)

31. port for optional USB keyboard and external USB data

32. PC communication and data transfer

33. ON-OFF switch with main fuse holders and main power supply connection

34. optional operator microphone port

Quick SIN Test

Quick SIN is a speech-in-noise test used to quickly evaluate patient capability to understand speech in noisy environment. The test is performed by submitting 6 sentences, each of them composed of 5 keywords, at a comfortable level, while the background noise is increased. A score is calculated based on recognized keywords, the total score assesses the patient understanding capability. Speech material is provided on SD-Card, for an easy test execution.

ABLB (Alternated Binaural Loudness Balance or Fowler Test)

Loudness recruitment test to help differentiate cochlear vs retrocochlear in the presence of a unilateral hearing loss. The test is carried out via air conduction whereby a pure tone of the same frequency is presented in one ear first, followed by the second ear. The intensity of the pure tone is varied with the goal to balance sensation of loudness for the better versus poorer ear. 

Stenger Test

Pure tone of the same frequency is introduced into both ears simultaneously at different intensity levels for assessing functional hearing loss. 

GAP Detection Threshold Test

Gap detection testing can be done several ways, but the premise is to introduce two stimuli (tones, clicks, broad band noise) of some duration with a variable gap between them. The subject is to identify whether they hear one sound or two sounds. The threshold at which the gap is sufficiently wide to be heard as two sounds is the ‘’gap detection threshold.’’

Difference Limen for Frequency Test

The minimum detectable change in the frequency of a pure tone is referred to as different limen. Presentation of two successive steady tones with slightly different frequencies are presented. The subject is asked to judge whether the first or the second had the higher frequency.

How do I add my logo to the report?

• go to MENU
• select TOOLS
• REPORT OPTIONS
• REPORT CUSTOMIZATION
• click the BUSINESS INFO tab. 
• right click on image place holder to LOAD logo   

Things to Know Before you Buy

The built-in printer feature is obsolete and no longer functional

At the end of 2021, the printer was discontinued and Resonance was unable to find a comparable replacement that would fit in the unit.  Rather than redesigning the r27a form factor, the built-in printer comportment remains on current units. 

The unit does come packaged with free MDS software that allows data transfer from the audiometer to your PC for data management and report generation. The transferred data can be printed off from your PC. This represents the most common way providers print data from this unit. Another option for printing data from the unit is to purchase a compatible external printer that connects directly to the unit.  

Three different versions of the r27a are available; make the most informed decision by reading this

Three versions include r27a-DD45, r27a-INSERT, and r27a-HDA. All three are identical with the exception packaged transducer.  The r27a-DD45 comes with DD45 headphones, the r27a-INSERT is packaged with IP30 insert earphones, and the r27a-HDA comes packaged with D450 headphones because this particular unit offers extended high frequency testing capabilities (12 kHz). 

This unit is essentially the same as the r37a-DD45 minus a few special tests/features

The r27a-DD45 offers the same capabilities as the r37a-DD45 minus a few special test capabilities including SISI, Bekesy, and automated Tone Decay. From our experience, most choose the r27a-DD45 as the additional tests offered by the r37a-DD45 are mainly obsolete and not work the additional investment of ~$1700. Unless a multi-frequency feature is needed (to be able to test hearing at frequencies adjacent to standard audiometric frequencies like 1012 Hz or 1085 Hz), the r27a-DD45 is an appropriate choice. 

Technical support, calibration, and service is provided and managed through Oaktree Products

Responsive, efficient, and effective support is critical for busy providers to be able to use their equipment without delay. Equipment calibration is required annually. Equipment may need to be serviced over the years.  Oaktree Products has made arrangements to coordinate and provide support, calibration and service to allow providers to focus on their clinical practice.

NOTE:

• see PRODUCT DOCUMENTS tab and click SOFTWARE MANUAL to download MDS User Manual
• QUICK START and QUICK START NOAH instructions outlined below after INSTALLATION

Minimal Requirements for PC to work with MDS Software:

• Windows XP
• Windows Vista
• Windows 7
• Windows 8

Minimal Requirements for Noah to work with MDS Software:

• Noah version 4.X.

Resonance MDS Software & License Key:

The Resonance MDS Software is included free of charge with this Resonance unit. The software allows creation and management of a patient database on your PC and the ability to transfer patient information and test results from your Resonance unit to your PC. As a software program, a license key will be required to permanently activate the MDS software. The license key can be found within the Resonance License PDF file that resides in the MDS Suite folder on the USB thumb drive packaged with your unit. Print or refer to this file when your unit generates a prompt for MDS License Key Activation. 

MDS License Key Activation: 

The MDS software file resides in the MDS folder on the USB thumb drive packaged with your unit. The software is located on the USB thumb drive packaged with the unit.  Go to the MDS Suite folder, click MDS Setup and follow installation instructions. Be sure to click "Create Shortcut to Desktop" when prompted to have the software icon appear on your desktop for easiest access. NOTE: MDS software will accommodate data from five patients without requiring a software license activation key. When trying to add data from the sixth patient, the following Licensure Key activation window will appear:

This means the demo version of the MDS software has expired and it will be necessary to enter the License Key associated with your specific unit.  The MDS License Key is listed in the PDF file called Resonance License located within the MDS folder on the USB thumb drive that came packaged with the unit.  If you are unable to find the PDF file, contact Oaktree Products with the make/model and serial number of your unit.  We will make arrangements for the vendor to issue the necessary MDS License Key. 

Cables for Connection with PC:

The Resonance device can be connected to a PC using a USB cable (included)

INSTALLATION: 

• Insert USB drive to PC
• Double click file "MRS Resonance Setup.exe" to begin install
  • select YES if prompted with "Do you want to allow the following program from an unknown publisher make changes to your computer?"
• Select language for installation from provided choices
• At the Welcome screen, to continue, select NEXT
• When prompted "Would you like to install this device software?", check the box next to "Always trust software from MRS Srl", then click INSTALL
• When installation complete, select either "Run MRS Resonance Now" to run the program immediately, or click FINISH to complete installation and exit the program
• The icon of the program will now be present on the PC desktop and in the program bar called MRS Resonance

Quick Start Instructions:

• launch program
• at the authentication window, "admin" will populate as UserName
  • type "a" (lower case letter a) as the password (password can be changed later)
  • check the box "remember me" to no longer have the authentication window populate when launching program
• click SESSIONS (upper horizontal menu bar)

To Create a New Patient:

• click NEW (from upper horizontal menu bar)
• fill the the following MANDATORY FIELDS
  • First Name
  • Surname
  • Birth Date
  • Birth Place
  • Choose Gender
  • click PRIVACY ACCEPTED
• click SAVE to create patient
• click EDIT (to proceed with transferring data from Resonance device to your PC)

Transferring data from Resonance unit to PC:

• after creating NEW patient, the icon "Acquire data from device" will be active
• conduct test on the Resonance unit
• connect Resonance device to the PC where MDS is running
• click on "Acquire data from device"
• an "Acquisition" or "Acquisizione" window will appear
  • select the Resonance device from pull down menu appearing under destination patient name
  • click DOWNLOAD
  • once the system indicates "Acquired Data", click SAVE & EXIT button to store data in database

View transferred test data:

Once data is transferred from a Resonance unit to a PC and saved, the test data will not reside in the '"Patient Historic Sessions" area located in lower left hand portion of the screen. To view the transferred data:

• select SESSIONS tab located in the lower right hand portion of the screen under the image of the patient silhouette
• in the TESTS IN SELECTION SESSION, click VIEW TEST DETAIL  

QUICK START NOAH:

• launch MDS
• click icon in the left upper corner of main window
• select TOOLS > Noah > Register Module (this procedure executed one time only)
• close Resonance software suite and run Noah
• once Noah opened, a RESONANCE button will appear in the upper horizontal menu
• to transfer data, follow instructions outlined above QUICK START INSTRUCTIONS, and select a patient in the Noah database
• click RESONANCE button to run MDS
• MDS will initiate; when the "Acquisition" or "Acquisizione" window appears, click DOWNLOAD to transfer data to Noah database