{"id":5200,"date":"2024-12-03T09:53:17","date_gmt":"2024-12-03T15:53:17","guid":{"rendered":"https:\/\/adcaraudio.com\/store\/?post_type=product&p=5200"},"modified":"2026-03-08T16:01:27","modified_gmt":"2026-03-08T22:01:27","slug":"m6-master-series-6-7-mid-woofer","status":"publish","type":"product","link":"https:\/\/adcaraudio.com\/store\/product\/m6-master-series-6-7-mid-woofer\/","title":{"rendered":"M6 – Master Series 6.7″ mid-woofer"},"content":{"rendered":"

Overview<\/h1>\n

The Master Series M6 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 51mm \/ 2\u201d voice coil diameter for high power handling and motor force.<\/p>\n

The M6 mid-woofer features a split-gap design which provides \u00b18.7mm of linear excursion, allowing for displacement equal to many 8 inch woofers. The high linear stroke features a flat BL curve for exceptional dynamics and impact.<\/p>\n

The M6 has multiple copper shorting rings within its magnetic structure. These features result in exceptionally low inductance at all operational frequencies and across stroke.\u00a0 This further extends bandwidth as well as reduces motional intermodulation distortion for a much more open and natural midrange.<\/p>\n

The M6 uses a thermo-fused woven, strand-oriented-chain hardened polyolefin cone.\u00a0 This cone features very high strength due to the strand orientation of the polyolefin monomer chains, and exceptional internal damping from the polyolefin itself.\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> , approximately 40% that of carbon fiber.<\/p>\n

The M6 basket is also extremely open and holds the motor structure at the rear, so that basket-based reflections back up to the cone are minimized.\u00a0 Use of 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 M6 mid-woofer is a wide bandwidth, high stroke speaker. \u00a0A low pass crossover should be set no higher than 3500 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<\/b><\/td>\n18dB\/Oct<\/b><\/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 necessary<\/td>\nNot necessary<\/td>\nNot necessary<\/td>\nNot necessary<\/td>\n<\/tr>\n
200W<\/td>\n100 Hz<\/td>\n80 Hz<\/td>\n70 Hz<\/td>\n60 Hz<\/td>\n<\/tr>\n
400W<\/td>\n170 Hz<\/td>\n135 Hz<\/td>\n110 Hz<\/td>\n100 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

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\"\"<\/p>\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>\n86 dB @ 1W, 1m (89 dB @ 2.83Vrms, 1m)<\/td>\n<\/tr>\n
Resonant Frequency (Fs)<\/td>\n65 Hz \u00b110%<\/td>\n<\/tr>\n
Total System Q (Qts)<\/td>\n0.75\u00b115%<\/td>\n<\/tr>\n
Equivalent Volume Air (Vas)<\/td>\n8 liters\u00a0 \u00b115%<\/td>\n<\/tr>\n
Motor Force (BL)<\/td>\n5.8 N\/A\u00a0 \u00b110%<\/td>\n<\/tr>\n
Inductance (Le)<\/td>\n0.110mH\u00b15%<\/td>\n<\/tr>\n
DC Resistance (DCR)<\/td>\n3.8 Ohms\u00a0 \u00b15%<\/td>\n<\/tr>\n
Moving Mass (Mms)<\/td>\n21 grams\u00a0 \u00b110%<\/td>\n<\/tr>\n
Electrical Q (Qes)<\/td>\n0.95\u00b110%<\/td>\n<\/tr>\n
Mechanical Q (Qms)<\/td>\n3.5\u00b115%<\/td>\n<\/tr>\n
Diaphragm Surface Area (Sd)<\/td>\n133 cm\u00b2\u00b12%<\/td>\n<\/tr>\n
Linear Excursion (Xmax)<\/td>\n8.7mm one way\u00a0 \u00b15%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
<\/pre>\n","protected":false},"excerpt":{"rendered":"
<\/h3>\n
 <\/p>\n
    \n
  • 6.7″ (170.6 mm) Mid-woofer<\/li>\n
  • Custom tooled cast frame with open design minimizes reflections to cone<\/li>\n
  • 2″ (51mm) voice coil for extreme power handling and motor force<\/li>\n
  • Patented split gap motor with multiple copper shorting rings for extended response and world class dynamics and impact<\/li>\n
  • Industry leading +\/- 8.7mm of one-way linear excursion<\/li>\n
  • Thermo-fused woven polyolefin cone for superior damping<\/li>\n
  • Reverse roll rubber surround<\/li>\n
  • Push pin terminals<\/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 60Hz at 24dB\/Octave, 70Hz at 18dB\/Octave, or 80Hz at 12dB\/Octave.<\/p>\n","protected":false},"featured_media":5714,"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":[46,79,52,16],"product_tag":[],"class_list":{"0":"post-5200","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-components","7":"product_cat-master-series-speakers","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\/5200","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\/5714"}],"wp:attachment":[{"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/media?parent=5200"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/product_brand?post=5200"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/product_cat?post=5200"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/product_tag?post=5200"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}