{"id":6746,"date":"2026-03-07T13:54:29","date_gmt":"2026-03-07T19:54:29","guid":{"rendered":"https:\/\/adcaraudio.com\/store\/?post_type=product&p=6746"},"modified":"2026-04-06T15:55:41","modified_gmt":"2026-04-06T21:55:41","slug":"h6-high-fidelity-6-5-mid-woofer","status":"publish","type":"product","link":"https:\/\/adcaraudio.com\/store\/product\/h6-high-fidelity-6-5-mid-woofer\/","title":{"rendered":"H6 – High Fidelity 6.5″ mid-woofer"},"content":{"rendered":"

Overview<\/h1>\n

The High Fidelity H6 mid-woofer is a high stroke, low distortion high output mid-woofer.\u00a0 This speaker features high stroke, low distortion, wide bandwidth, and high power handling.\u00a0 It features a 44.4mm \/ 1.75\u201d voice coil diameter for high power handling and motor force.<\/p>\n

The H6 mid-woofer features a split-gap design which provides \u00b16.5mm of linear excursion, allowing for displacement equal to many 8 inch mid-bass. The high linear stroke features a flat BL curve for exceptional dynamics and impact.<\/p>\n

The H6 has integral shorting rings within its magnetic structure. This feature results in exceptionally low inductance at all operational frequencies and across stroke.\u00a0 This reduces motional intermodulation distortion for a much more open and natural midrange.<\/p>\n

The H6 uses a woven strand-oriented polymer thermo-set cone for superior damping.\u00a0 The thermal fusing ensures an air-tight surface without degrading the woven feature and strand orientation.\u00a0 The result is a cone with over 600 MPa of tensile strength, vastly superior internal damping as compared to carbon and glass fibers, and a density of just 0.9 g\/cm3<\/sup>\u00a0, approximately 40% that of carbon fiber.<\/p>\n

The H6 uses a shallow split gap motor structure and custom tooled basket, surround, cone, and spider result in a very shallow mounting depth so the mid-woofer can fit into shallow locations, enabling creative positioning for best acoustical performance.<\/p>\n

Crossover Frequency and power handling<\/h2>\n

The H6 mid-woofer is a wide bandwidth, high stroke speaker. \u00a0A low pass crossover should be set no higher than 3000 Hz.\u00a0 The actual value should be selected based upon the paired tweeter, midrange, or full-range speaker.<\/p>\n

The bottom end is robust, and can often forego a subsonic filter.\u00a0 The following table summarizes general guidelines about a subsonic filter.\u00a0 As noted above, this is not a hard-and-fast set of limits, and the final installation needs to be considered when setting actual crossover values and gains.<\/p>\n\n\n\n\n\n\n\n
Power<\/strong><\/td>\n6dB\/Oct<\/b><\/td>\n12dB\/Oct<\/strong><\/td>\n18dB\/Oct<\/strong><\/td>\n24dB\/Oct<\/b><\/td>\n<\/tr>\n
50W<\/td>\nNot necessary<\/td>\nNot necessary<\/td>\nNot necessary<\/td>\nNot necessary<\/td>\n<\/tr>\n
100W<\/td>\nNot recommended<\/td>\n60 Hz<\/td>\n50 Hz<\/td>\n45 Hz<\/td>\n<\/tr>\n
200W<\/td>\nNot recommended<\/td>\n85 Hz<\/td>\n75 Hz<\/td>\n65 Hz<\/td>\n<\/tr>\n
300W<\/td>\nNot recommended<\/td>\n110 Hz<\/td>\n90 Hz<\/td>\n80 Hz<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/h2>\n

Note that with lower power applications, these frequencies may be adjusted down; with higher power, you may need to adjust the frequencies up.\u00a0 Again, the actual implementation of the entire system needs to be considered when installing these products.\u00a0 A small sealed chamber behind the midrange can increase mechanical power handling, but may negatively impact thermal power handling.<\/p>\n

\"\"<\/p>\n

 <\/p>\n

\"\"<\/h2>\n

Thiele Small Parameters<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Nominal Impedance<\/td>\n4 Ohms<\/td>\n<\/tr>\n
Nominal SPL<\/td>\n85.61 dB @ 1W, 1m (89.54 dB @ 2.83Vrms, 1m)<\/td>\n<\/tr>\n
Resonant Frequency (Fs)<\/td>\n50 Hz \u00b110%<\/td>\n<\/tr>\n
Total System Q (Qts)<\/td>\n0.398 \u00b115%<\/td>\n<\/tr>\n
Equivalent Volume Air (Vas)<\/td>\n8.142 liters\u00a0 \u00b115%<\/td>\n<\/tr>\n
Motor Force (BL)<\/td>\n7.814 N\/A\u00a0 \u00b110%<\/td>\n<\/tr>\n
Inductance at 1 kHz (Le)<\/td>\n0.327 mH\u00a0 \u00b15%<\/td>\n<\/tr>\n
DC Resistance (DCR)<\/td>\n3.24 Ohms\u00a0 \u00b15%<\/td>\n<\/tr>\n
Moving Mass (Mms)<\/td>\n26.51 grams\u00a0 \u00b110%<\/td>\n<\/tr>\n
Electrical Q (Qes)<\/td>\n0.442 \u00b110%<\/td>\n<\/tr>\n
Mechanical Q (Qms)<\/td>\n4.046 \u00b115%<\/td>\n<\/tr>\n
Diaphragm Surface Area (Sd)<\/td>\n122.5 cm\u00b2\u00b12%<\/td>\n<\/tr>\n
Linear Excursion (Xmax)<\/td>\n6.5mm one way\u00a0 \u00b15%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

 <\/p>\n

    \n
  • 6.5″ Mid-woofer<\/li>\n
  • Custom tooled cast frame with integral anti-resonance termination ring<\/li>\n
  • 1.75″ (44.4mm) voice coil for extreme power handling and motor force<\/li>\n
  • Split aluminum black anodized former for improved power handling and magnetic damping<\/li>\n
  • Patented dual gap motor architecture for flat BL during linear excursion<\/li>\n
  • Flat BL during linear excursion results in world class dynamics and impact<\/li>\n
  • +\/- 6.5mm of linear excursion<\/li>\n
  • Bottomless speaker design with suspension-limited travel<\/li>\n
  • Woven strand-oriented polymer thermo-set cone for superior damping<\/li>\n
  • Low-loss natural rubber inverted surround<\/li>\n
  • Nickel plated terminals<\/li>\n
  • Sold in pairs<\/li>\n
  • 4 ohm<\/li>\n
  • 250 Watts RMS power handling*<\/li>\n<\/ul>\n

    * All power ratings are figured using an electronic high pass crossover with a minimum crossover point of 80Hz at 24dB\/Octave, 90Hz at 18dB\/Octave, or 110Hz at 12dB\/Octave.<\/p>\n","protected":false},"featured_media":7024,"template":"","meta":{"jetpack_post_was_ever_published":false,"jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"product_brand":[],"product_cat":[46,84,52,16],"product_tag":[],"class_list":{"0":"post-6746","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-components","7":"product_cat-high-fidelity","8":"product_cat-mid-woofer","9":"product_cat-speakers","11":"first","12":"instock","13":"taxable","14":"shipping-taxable","15":"purchasable","16":"product-type-simple"},"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/product\/6746","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/media\/7024"}],"wp:attachment":[{"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/media?parent=6746"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/product_brand?post=6746"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/product_cat?post=6746"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/product_tag?post=6746"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}