{"product_id":"caldera-open-ltd-walnut-burl","title":"Caldera Open LTD Walnut Burl","description":"\u003ch3\u003eMini-drop Friday 2.13\u003c\/h3\u003e\n\u003cp\u003e\u003cem\u003eThese Caldera Closed Walnut Burl LTDs will drop 1-of-1 style, allowing you to choose the burl that speaks to you! There will be a curated variety of aesthetic and functional configurations available, with specs denoted on each individual photo and listed for preview the day before the drop. New units will be released periodically.  Subscribe to the ZMF email list for a heads up on release dates!\u003c\/em\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"whitespace-normal break-words\"\u003e\u003cb\u003eWalnut Burl\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin-bottom: 6.0pt;\"\u003eWalnut Burl represents nature's most prized wood formation—born from stress and time in the making. Burls develop when walnut trees respond to injury or environmental stress by producing massive, chaotic growth nodes filled with wild, swirling grain patterns. Each burl cup reveals the possibility of eyes, mineral streaking, and figure ranging from deep chocolate browns to warm amber tones with darker mahogany accents. \u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin-bottom: 6.0pt;\"\u003eSonically, burl walnut's dense, complex structure provides excellent damping and warmth that perfectly complements the Caldera's planar precision. The chaotic grain orientation—nature's response to stress—creates natural acoustic complexity that adds subtle harmonic richness to the Caldera's already legendary resolution. The wood's density enhances bass texture and weight while the intricate figure helps control resonance, allowing the patented CAMS magnet structure and silver-coated diaphragm to deliver their full potential. The result maintains the Caldera's expansive controlled stage and detailed midrange while adding organic warmth and timbral accuracy that makes acoustic instruments breathe with life.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin-bottom: .25in;\"\u003eThis Spring 2026 Limited Edition features brass grilles with black cloth, creating warm contrast against the burl's rich chocolate tones. Choose a black aluminum chassis with black rods, and an optional black B.B.B. add-on (installed), or upgrade to an Amber Mg12 Chassis with brass rods and matching Amber B.B.B.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cem\u003ePlease note that the wild figuring and chaotic grain of Walnut Burl will result in fills, which are not flaws but part of the distinctive beauty of the wood.\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLearn more about the wood we use in our headphones \u003c\/span\u003e\u003ca rel=\"null\" aria-describedby=\"a11y-new-window-external-message\" href=\"https:\/\/www.zmfheadphones.com\/wood\" target=\"_blank\"\u003ehere\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eINCLUDES\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCaldera Open Walnut Burl\u003c\/li\u003e\n\u003cli\u003eSeahorse Case\u003c\/li\u003e\n\u003cli\u003eZMF Stock Braided Cable\u003c\/li\u003e\n\u003cli\u003eZMF Stock + Secondary Leather or Suede Pads (depending on Vegan Options)\u003c\/li\u003e\n\u003cli\u003eZMF Owner's Card\u003c\/li\u003e\n\u003cli\u003eLifetime Driver Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003e\n\u003cem\u003eWe ship worldwide! If you are unsure about ordering, see our\u003ca href=\"https:\/\/shop.zmfheadphones.com\/policies\/shipping-policy\"\u003e\u003cspan\u003e \u003c\/span\u003eShipping FAQ\u003c\/a\u003e or check to see if we have a\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.zmfheadphones.com\/dealersnew\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eCertified Dealer\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003ein your country.\u003c\/em\u003e\u003cbr\u003e\u003cem\u003eStill curious? Check out our\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.zmfheadphones.com\/zmf-faq-order\" rel=\"noopener\" target=\"_blank\"\u003eOrder FAQ page\u003c\/a\u003e or learn more \u003ca href=\"https:\/\/www.zmfheadphones.com\/zmf-faq\" rel=\"noopener\" target=\"_blank\"\u003eabout ZMF\u003c\/a\u003e.\u003c\/em\u003e\n\u003c\/h6\u003e\n\u003cblockquote\u003e\u003c\/blockquote\u003e","brand":"ZMF Headphones","offers":[{"title":"#1 (Aluminum Black | Brass Grille | Black Rods)","offer_id":47334545293475,"sku":"CALO-LTD-1","price":3599.99,"currency_code":"USD","in_stock":false},{"title":"#2 (Aluminum Black | Brass Grille | Black Rods)","offer_id":47334545326243,"sku":"CALO-LTD-2","price":3599.99,"currency_code":"USD","in_stock":true},{"title":"#3 (Aluminum Black | Brass Grille | Black Rods)","offer_id":47334545359011,"sku":"CALO-LTD-3","price":3599.99,"currency_code":"USD","in_stock":true},{"title":"#4 (Mg12 Amber | Brass Grille | Brass Rods | Amber BBB)","offer_id":47334545391779,"sku":"CALO-LTD-4","price":3799.99,"currency_code":"USD","in_stock":false},{"title":"#5 (Mg12 Black | Black Grille | Black Rods | Black BBB)","offer_id":47334545424547,"sku":"CALO-LTD-5","price":3799.99,"currency_code":"USD","in_stock":true},{"title":"#6 (Mg12 Black | Black Grille | Black Rods | Black BBB)","offer_id":47334545457315,"sku":"CALO-LTD-6","price":3799.99,"currency_code":"USD","in_stock":true},{"title":"#7 (Mg12 Black | Black Grille | Black Rods | Coffee BBB)","offer_id":47334545490083,"sku":"CALO-LTD-7","price":3799.99,"currency_code":"USD","in_stock":false},{"title":"#8 (Mg12 Amber | Brass Grille | Brass Rods | Amber BBB)","offer_id":47334545522851,"sku":"CALO-LTD-8","price":3799.99,"currency_code":"USD","in_stock":false},{"title":"#9 (Aluminum Black | Brass Grille | Black Rods)","offer_id":47334545555619,"sku":"CALO-LTD-9","price":3599.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0486\/8610\/4739\/files\/DSC5059.jpg?v=1770318983","url":"https:\/\/shop.zmfheadphones.com\/products\/caldera-open-ltd-walnut-burl","provider":"ZMF Headphones","version":"1.0","type":"link"}