{"type":"product","schema_version":"1.0","item_id":"101707040618","canonical_url":"https://tw.bid.yahoo.com/item/101707040618","title":"二手美品 JBL 4345 Studio Monitor 18\"低音","subtitle":null,"condition":"近全新","currency":"TWD","observed_at":"2026-04-25T00:46:33.261Z","current_price":300000,"original_price":null,"stock_status":"low_stock","available_quantity":1,"sold_quantity":0,"seller":{"id":"Y6731777779","name":"LegatoAudioLab","positive_rate":null,"rating_count":null},"images":[{"url":"https://img.yec.tw/ob/image/4611f389-1c10-497b-b37d-e3253b8e5a9a.jpg","role":"main","alt":"商品主圖","width":null,"height":null},{"url":"https://img.yec.tw/ob/image/edb65119-1624-4bbf-a09a-4d27047c4ab2.jpg","role":"detail","alt":"商品圖片 2","width":null,"height":null},{"url":"https://img.yec.tw/ob/image/51037e2e-b342-4ada-bbd3-530e8918ac3d.jpg","role":"detail","alt":"商品圖片 3","width":null,"height":null},{"url":"https://img.yec.tw/ob/image/99be0e2d-f1c3-467d-b78c-8ccfc1f7be15.jpg","role":"detail","alt":"商品圖片 4","width":null,"height":null},{"url":"https://img.yec.tw/ob/image/cd8bdd57-b799-41b9-9ef2-622b136f119f.jpg","role":"detail","alt":"商品圖片 5","width":null,"height":null}],"description":"一、基本定位與歷史背景- JBL 4345 是 JBL 專業系列（Professional Series）的一款大型錄音室監聽喇叭，推出於 1980 年代。其設計可視為對先前 4343 的擴充和升級版（使用更大的低音單體與更大音箱體積）。\n\n- \n\n- “Studio Monitor” 意味著其目標不只是 Hi-Fi 家用用途，而是為錄音室、監聽、專業用途設計，因此在精準度、線性響應、擴散控制等方面有較高要求與設計考量。\n\n二、核心規格\n\n以下為 JBL 官方與資料庫整理的規格概要（有些數字視版本或改裝可能略有差異）：\n\n                                        項目\n\n                                        規格\n\n                                                                系統形式\n\n                                        四路（4-way）、低音反射式（bass-reflex）地板型設計\n\n                                                        低音單體\n\n                                        46 cm（18 吋）圓錐式單體（型號 2245H）\n\n                                                        中低音單體\n\n                                        25 cm（10 吋）圓錐式單體                            2122H \n\n                                                        中音單體 / 音響角喇叭結構\n\n                                        複合擴散喇叭 + 齒型導波器 (horn + lens) 組合（如 2307 / 2308 / 2420 等單元）\n\n                                                        高音單體\n\n                                        鈴形振膜高音（ring-diaphragm                            tweeter）2405 型號\n\n                                                        頻率響應\n\n                                        約 32 Hz ～ 20 kHz ±3 dB \n\n                                                        效率（靈敏度）\n\n                                        約 95 dB / 1W /                            1m\n\n                                                        阻抗\n\n                                        8 Ω\n\n                                                        最大輸入功率\n\n                                        使用內部網絡（network）約 120 W；若進行多擴（bi-amp 或 multi-amp）方式，可承受更高輸入（例如高頻 100 W、低頻 200 W）\n\n                                                        分音點 / 分頻頻率\n\n                                        標準網絡分頻為 320                            Hz, 1.3 kHz, 10 kHz（4 路分音）\n\n                                                        箱體容積\n\n                                        低音箱體約 253 升，中低音箱體約 14 升\n\n         ...","shipping_methods":[{"name":"面交/自取/不寄送","fee":0,"currency":"TWD"},{"name":"大型/超重物品運送","fee":0,"currency":"TWD"}],"lowest_shipping_fee":null,"payment_methods":["ATM轉帳"],"category_id":"2092075255","category_name":"主喇叭","breadcrumb":[{"id":"2092101502","name":"家電與影音視聽","url":"/tw/%E5%AE%B6%E9%9B%BB%E8%88%87%E5%BD%B1%E9%9F%B3%E8%A6%96%E8%81%BD-2092101502-category.html"},{"id":"2092105885","name":"影音/視聽/MP3","url":"/tw/%E5%BD%B1%E9%9F%B3-%E8%A6%96%E8%81%BD-MP3-2092105885-category.html"},{"id":"2092075254","name":"喇叭","url":"/tw/%E5%96%87%E5%8F%AD-2092075254-category.html"},{"id":"2092075255","name":"主喇叭","url":"/tw/%E4%B8%BB%E5%96%87%E5%8F%AD-2092075255-category.html"}],"view_count":76,"watch_count":12}