Lesson 1Maximum power output (MPO) and output limiting strategies for loudness and safetyDetails MPO concepts, measurement, and clinical adjustment. Reviews output limiting via compression and peak clipping, balancing audibility, sound quality, and safety while preventing loudness discomfort and long-term auditory damage.
Defining MPO and its clinical relevanceMeasuring MPO in coupler and real earCompression limiting vs peak clippingSetting MPO for comfort and safetySpecial MPO issues in pediatric fittingsLesson 2Overview of hearing aid styles and form factors (BTE, RIC, ITE, CIC, RITE) and clinical implicationsDescribes major hearing aid styles, including BTE, RIC, ITE, CIC, and RITE. Examines cosmetic, acoustic, and handling implications, plus candidacy considerations such as dexterity, ear anatomy, and degree of hearing loss.
BTE and thin-tube fittingsRIC and RITE design considerationsITE, ITC, and CIC custom devicesOpen vs occluded fittings and ventingStyle selection based on patient needsLesson 3Common manufacturer fitting software features that affect verification (real-ear simulated targets, coupler-based presets) and limitationsReviews how manufacturer software generates simulated real-ear targets and coupler-based presets. Discusses assumptions, age and venting effects, and why independent REM is still required to confirm individualised fittings.
First-fit algorithms and default presetsReal-ear simulated targets in softwareCoupler-based fittings and assumptionsImpact of venting and acoustic couplingWhy REM is needed beyond softwareLesson 4Technical classifications: analogue vs digital, receiver-in-canal vs receiver-in-ear, programmable featuresClassifies hearing aids by signal processing and form factor. Explains analogue versus digital, RIC versus RITE terminology, and key programmable features that influence fitting flexibility, verification, and patient outcomes.
Analog vs digital processing basicsBTE, RIC, RITE, ITE, CIC distinctionsTelecoil, wireless, and streaming optionsDirectional microphones and noise reductionData logging and adaptive featuresLesson 5Fitting formulas: NAL-NL1/NL2 — principles, targets, strengths for speech intelligibilityCovers NAL-NL1 and NAL-NL2 development, goals, and target derivation. Emphasises speech intelligibility optimisation, loudness equalisation, and clinical selection between NAL variants for adults and special populations.
Historical development of NAL formulasSpeech intelligibility and loudness goalsDifferences between NAL-NL1 and NAL-NL2Selecting NAL vs DSL for adultsVerifying NAL fittings with REMLesson 6Fitting formulas: DSL v5 — principles, pediatric origin, use for severe losses and loudness managementExplores DSL v5 history, paediatric focus, and loudness normalisation. Covers candidacy, target derivation, and handling severe to profound losses, with emphasis on comfort, audibility, and verification considerations in daily clinical practice.
Historical development and pediatric rationaleLoudness normalization vs equalization conceptsDSL v5 targets for severe and profound lossesManaging loudness discomfort and safetyVerification of DSL fittings with REMLesson 7Real-ear verification (REM) fundamentals: probe placement, calibration, typical target curves and interpretationIntroduces REM concepts, equipment, and calibration. Covers probe tube placement, reference microphone use, and interpretation of common target curves, including REAR, REIG, and speech mapping displays in clinical software.
REM equipment and signal typesCorrect probe tube placement techniquesCalibration and reference mic controlUnderstanding REAR, REIG, and RECDReading and interpreting target curvesLesson 8Documentation and reporting for verification: recording REAR/REIG, target deviations and clinical decision rulesOutlines best practices for documenting verification, including REAR and REIG plots, target deviations, and clinical reasoning. Emphasises clear reporting for medico-legal needs, follow-up, and interprofessional communication.
Recording REAR and REIG measurementsDefining acceptable target deviationsNoting MPO and loudness outcomesWriting clear clinical justificationsReporting for referrals and insurersLesson 9Clinical resources and evidence summaries from professional bodies (recommendations for REM use)Summarises guidelines from AAA, ASHA, BSA, and other bodies on verification. Emphasises evidence for REM, recommended protocols, documentation, and how to integrate best-practice statements into routine clinical workflows.
Key AAA and ASHA REM recommendationsBSA and international REM guidanceEvidence comparing REM to first-fitBarriers to guideline implementationCommunicating best practice to patientsLesson 10Compression basics: attack/release times, number of channels, kneepoints, wide dynamic range compression rationaleExplains compression goals and parameters, including attack and release times, channels, and kneepoints. Discusses wide dynamic range compression, speech clarity, and how settings affect comfort, distortion, and verification.
Goals of compression in hearing aidsAttack and release time trade-offsNumber of channels and fine-tuningKneepoints and compression ratiosWDRC and speech audibility benefitsLesson 11Functional verification: aided speech-in-noise testing (QuickSIN, HINT), aided warble-tone thresholds, aided soundfield testingFocuses on functional verification using aided soundfield tests. Reviews QuickSIN, HINT, warble-tone thresholds, and how to interpret results alongside REM to guide counselling and fine-tuning decisions.
Aided soundfield warble-tone thresholdsQuickSIN setup and score interpretationUsing HINT and similar speech testsRelating functional tests to REM dataCounseling patients using test resultsLesson 12REM protocols: aided response, speech mapping, measurement conditions (soft, conversational, loud inputs) and corrections for SPL vs dB HLDetails REM protocols for aided responses and speech mapping. Covers test signals, input levels, measurement conditions, and converting between SPL and dB HL to ensure accurate, comparable verification results.
Selecting test signals and stimuliSoft, conversational, and loud inputsAided response vs insertion gain viewsCorrections between SPL and dB HLManaging test–retest variability
