CLASSICAL ORGANS SPECIFICATIONS/FEATURES COMPARISON Select 1, 2 or 3 Allen Organs listed. Then click "COMPARE" for a side-by-side listing of the organs' features. Chapel™ Organs Two-Manuals CF-2a CF-7 CF-15 Three-Manuals CF-30 Protégé™ Organs Two-Manuals 27-Stop Protégé 28-Stop Protégé 29-Stop Protégé 33-Stop Protégé       (Internal Speakers) 33-Stop Protégé       (External Speakers) Three-Manuals 38-Stop Protégé       (Internal Speakers) 38-Stop Protégé       (External Speakers) Quantum™ Organs Two-Manuals 29-Stop Quantum 37-Stop Quantum 45-Stop Quantum Three-Manuals 38-Stop Quantum 50-Stop Quantum 58-Stop Quantum 80-Stop Quantum Four-Manuals 79-Stop Quantum 87-Stop Quantum 128-Stop Quantum 136-Stop Quantum Heritage™ Quantum™ Organs Two-Manuals Heritage II-45C Quantum Three-Manuals Heritage III-50C Quantum Heritage III-58C Quantum Heritage III-80C Quantum Four-Manuals Heritage IV-79C Quantum Heritage IV-87C Quantum Heritage IV-128 Quantum Heritage IV-136 Quantum Diane Bish Signature Series™ Quantum™ Organs Two-Manuals Diane Bish-36 Quantum Three-Manuals Diane Bish-50 Quantum Diane Bish-58 Quantum Diane Bish-80 Quantum