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Yahoo Bid Home Appliances, Audio & Video, Camera Audio Equipment Speakers General Fostex
長岡鉄男氏考案『ダブルベース』準無指向性 希少アルニコ25cm×2 無垢材バッフル60リットル密閉式 12Ω 35W デュアルバナナプラグ対応
        

PM-2521と2522は背面は全く同じ!

ショパンコンクールを試聴、3位の中国人。

回路図、数値は違います。

  • Product Quantity
    : 1
  • Starting Bid
    :6,800円
  • Highest Bidder
    : cdt******** / Rating:295
  • Listing Date
    :2026年02月23日 22時45分
  • Bidding closes on
    :2026年03月01日 21時44分
  • Auction Number
    :n1217246372
  • Condition
    :Damaged and stained (specify in description)
  • Automatic Extension
    :Yes
  • Authentication
    :No
  • Early Closing
    :Yes
  • Can I return the product?
    :no
  • Description
  • Q&A ()
  • Cost Estimator
  • Problem Item Response Procedur
Notes
  1. It is possible that the product can only be picked up by yourself, and the self-pickup fee is quite high, please check the page to confirm
  2. The product may be dented or collapsed, please ask clearly and pay attention before placing a bid.
  3. ※Please confirm whether it is animal fur. Animal fur products are in conflict with the Washington Treaty and cannot be shipped internationally.

長岡鉄男氏考案のダブルベースを、珍しいブラザー工業のフロアー・スピーカーのエンクロージャーにダイヤトーンのDS-251mkⅡのウーファーを流用して作ってみました。

長岡鉄男氏のダブルベースが内容量35リットルに20cm×2。長岡氏はダブル・ベースは20cm位が上限と書いてましたが、60リットルものエンクロージャーが永らく棚替わりとなっていたうえ、DS‐251MkⅡが4個も入手できたので、やや小さめですが作ることにしました。


詳しくはこちら↓

https://audio-heritage.jp/DIATONE/diatoneds/ds-251mkii.html


ブラザー製エンクロージャーBS‐102は&側板&裏板が21mm厚のホモゲンホルツで、がっしり造られていて、オーディオ専門メーカーのを凌ぎます。正面バッフルは19mm厚の無垢集成材を新たに取り付けました。


前のユニットはPW‐2521BM。コーン紙は紙製、センターキャップも紙製、、エッジは布製で劣化の心配はありません。マグネットは95×60×63mmのフレームに囲まれた径45mm厚さ25mmのフェライト・マグネット、インピーダンス6Ω、定格入力は15Wです。


後ろのユニットはPW‐2522BM。コーン紙、センターキャップ、エッジとマグネット部は同じです。インピーダンス6Ω、定格入力20Wです。片方センターキャップ凹み修正跡があります。

シリーズ接続し1.0mHを挟んでハイカット・クロスオーバー周波数は2.7kHzです。


ソフトドーム・ツィーターはヤマハ製。ダイヤフラムは布製、マグネットは径88mm厚さ28mmの防磁型、インピーダンス6Ω、最大入力はシステム上100W、パラレル接続した7.8μFと0.82mHを挟んで、クロスオーバー周波数は2.4kHzです。片方、凹み修正跡があります。


詳しくは写真の回路図を参照してください。システム・インピーダンスは12Ωになりました。


吸音材は4面のみ、ウーファーとターミナル間は、オーディオテクニカ等のOFCケーブル(16AWG)で繋ぎました。


試聴では、ペダルトーンで埋め尽くされているJ.S.バッハのペダル練習曲BWV598(手持のテストCD;トン・コープマン:1734年製ミュラー・オルガン;アムステルダム;最低音36Hz)を、見事なバランスで鳴らしました。この曲は勿論足鍵盤の練習用でもありますが、当時最高のオルガン・コンサルタントでもあったバッハが、すべてのパイプがちゃんと鳴っているかどうかのチェックをするための曲でもあり、スピーカーにとっては、低域に変なピークやディップがないかどうかのテストとしても使える便利な曲です。密閉式なので、当然のこと変なピークやディップは全くありません。


本格的試聴では、J.S.バッハの前奏曲とフーガハ短調BWV546(手持の最強テストCD;トン・コープマン:ミュラー製作オルガン1734;最低音32Hz)の最初のCのロングトーンを、かなりの大音量でも見事に鳴らし切りました!能率では20cm×2を遥かに上回ります。


バッハの最高傑作、前奏曲とフーガハ短調BWV548(手持のテストCD;トン・コープマン:1692年製シュニットガー・オルガン;フローニンゲン:最低音36Hz)の方は、更なる大音量でも見事に鳴らし切りました。


ピアノやオーケストラは、将に本領発揮!準無指向性のせいかもしれません。


外観は遠目には概ねキレイですが、長期保存のため、小傷、汚れ、シートがれ修理跡があります。サランネットも汚れはありますが無事です


重さ21kg超。サイズは68×38×40cmです。


発送は2個口になります。静岡県、神奈川県、山梨県、南信、三河地域、東京都多摩地域の方々は、直接引き取りや直接配達の方が安価くなります。


2026年、ガソリン税率が下がって、直接配達が20%オフになりました。

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Product Price JPY
Japanese Consumption Tax(10%) JPY

A 10% consumption tax is applied to goods and services in Japan. The price may include the tax or it may be added separately. Please check the price details when ordering.

Note: This is a domestic sales tax applied within Japan.

Japan Local Shipping Fee JPY Japan Local Shipping Fee Reference
Product Weight KG The maximum weight limit is 30 kg
International Shipping Methods
Proxy bidding and purchasing services are becoming increasingly convenient. However, overseas shopping carries certain risks and issues. To reduce these risks and enhance shopping safety, please be sure to read the following information:

1. International Shipping

   Air Freight: If the item status is not confirmed within two days after the arrival notice, any customer complaints cannot be addressed with the seller.

2. After Receiving the Product

Please confirm and inspect the product as soon as possible to ensure that the product specifications, quantity, accessories, and description are correct

If, unfortunately, there are any issues, you can refer to the following examples on how to report related product problems:
1. Example of missing product information
2. Example of product not matching provided information
3. Example of damaged product information

Important Notes: 1. If the seller is unwilling to ship overseas or is unaware that the product will be shipped overseas, the international shipping cost for returns or exchanges will need to be borne by the member. You may refer to the EMS e-Express fee inquiry from the post office. If it involves alcoholic beverages or items that affect flight safety, the post office cannot be used for shipment, and only DHL can be used to ship back to Japan.
2. During the product complaint handling period, please retain the complete outer packaging of the product (including the shipping label information), and refrain from attempting any repairs or altering the original condition. Any modifications may result in the inability to process the case.

3. After Inspecting the Product

After receiving and inspecting the item, if you have any questions, it is recommended to contact Letao within 2 hours. Here are some reminders:

1. Please do not unpack, use or repair the received item yourself, and be sure to keep the original packaging to facilitate subsequent handling of related matters, so as to avoid changes to the item that may cause the seller to be unwilling to process.

2. You can call customer service, and the customer service will leave a message for you as below. Please provide the following information:
"Hello, we will first help you establish a complaint case for Product ID: _______ .But we need you to 2-3 clear photos of the product issue, including photos of the product problem, product packaging, shipping details slip, and outer box. Send them to service@letao.my and inform us of your desired resolution (failing to provide this may result in an inability to process subsequent matters). After sending the email, notify us in the customer service message. We will confirm with the seller as soon as possible. and if there are any related questions, we will contact you through the customer service message. Thank you for your cooperation."

Please provide:
1. "Product ID"
2. Photo of the "Delivery Note" (if any)
3. Photos of the outer box (including inner and outer packaging)
4. Photos of the product (Please include relevant descriptions to help us confirm with the seller)

Important Notes:
1. Do not include foreign text or other products in the background of the image.
2. Please keep the complete product packaging (including the shipping label information), and refrain from repairing or altering the original condition on your own, as any changes may result in the case being unable to be processed.
3. Please provide the relevant information within 48 hours to avoid missing the golden hour for reflection and causing situations that cannot be handled.
4. Due to 99% of Japanese sellers being unwilling or unaware of shipping goods overseas, if a seller is willing to handle the issue, the goods must be sent back to Japan, and the international shipping costs incurred must be borne by the member. Letao will use postal EMS international express to send the goods back to Japan.
5. As the goods are purchased from overseas, it may take approximately one to two weeks to complete the relevant processing procedures when issues arise with the goods. Please be reminded that you can inquire about the approximate cost through the EMS service at the post office.

4. FAQ

1. Issue of Authenticity: If antique or branded goods are found to be counterfeit upon receipt, clear photos showing the differences between the genuine product and the imitation must be provided as evidence. If unable to provide relevant proof, assistance can be sought to find a third-party reputable organization for a premium authentication service .
2. Leaking Iron Teapot: If an antique iron teapot is leaking, please take clear photos of the leaking area and provide them.
3. Transport Damage: If the goods are damaged during international shipping (to the pickup point), you need to provide photos of the outer packaging of the parcel and clear photos of the damaged goods' outer packaging.

※ Note: Photos provided to sellers should not contain any foreign-related information.
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    Product name: 長岡鉄男氏考案『ダブルベース』準無指向性 希少アルニコ25cm×2 無垢材バッフル60リットル密閉式 12Ω 35W デュアルバナナプラグ対応
    Notes:
    Customer service hours:
    • Monday to Friday 10:00-18:00
    Customer service hotline:
    Customer Service Email: service@letao.my