傲士音響與創立于1948年的、有著60年悠久歷史的世界頂級喇叭制造商挪威SEAS首次面向發燒友聯合推出的普及版發燒音箱套件mimir(巨人),由SEAS專業工程師負責設計,平價靚聲、性價比極高。

  套件包括:SEAS H1189 1”高音喇叭 2只
SEAS H1215 6.5”低音喇叭 2只
SEAS原廠設計重料分音器 2個
CMC原廠高級喇叭輸出端子 4支
優質專用箱內線若干;安裝用螺絲一套。
SEAS認可的SEAS精美銘牌 2片

在收到貨款全額之日起一個星期內發貨。
套件價格:每套3,380元/套。

附注1:精美音箱1,000元/對.(含運費)
附注2:實物的音箱顏色與光澤和照片有所不同,這完全是由拍照
時的燈光造成的差異。


套件中文說明書(根據西雅士套件原英文翻譯)
原廠設計的分頻器圖紙 點擊下載


原廠設計的音箱圖紙
點擊下載

我們最新研制的兩分頻喇叭套件,命名為Mimir(巨人),巨人(Mimir)是古代北歐神話中一位以知識和智慧而著名的神。這款套件是由18cm口徑的紙盆涂膠低音喇叭CA18RNX和27mm直徑的絲膜涂膠高音喇叭27TDFC組成。

箱體和填充材料
Mimir(巨人)音箱箱體的設計等效容積為14公升,它可在一些音箱DIY專門店自行組裝完成。這款套件組裝容易,適合初學者入門。如果你不想自己組裝,可以找當地的套件經銷商來幫你完成組裝。在你組裝時請記住重要的一點:保持障板寬度和正確的箱體等效容積。為了使音箱的壽命更長,建議在組裝音箱時增加一些內部支撐物使箱體的強度更好。
填充物的數量和倒相管的調整是以實際測量和聽音為基礎進行的。音箱內用100g的吸音棉填滿。吸音棉要均勻分布在音箱里,但要離開倒相孔口以便空氣的自由流動,確保氣流噪聲盡可能低。倒相管的總長度是20cm內徑是5cm。調整后的低頻下限為42Hz,能提供一個平滑的低頻滾降。

喇叭單元
系統中使用的是低音喇叭是SEAS CA18RNX。這是一款18cm口徑的、采用傳統紙盆涂膠技術的錐盆低音喇叭,這種設計為這款喇叭提供了一個有可控滾降的平坦擴展的頻率響應。大型的磁體系統實現更好的瞬變,緩沖背板(彈波)與很長且很輕的銅鍍鋁音圈一起可以在輕度失真的情況下減少音圈位移。堅固的鑄造合金盆架保證了重要部件的組合。合金盆架上較大的鏤空設計使回聲、氣流噪聲和空腔諧振等降低到最低水平。
高音喇叭使用的是SEAS 27TDFC。這是一款27mm直徑的半球頂絲質涂膠振膜的高音喇叭,這個半球頂絲質涂膠振膜讓這款高音喇叭實現了平坦的特性和良好的穩定性,同時也減少了空氣濕度給振膜帶來的影響。音圈鑲嵌在一個鋁制骨架上,這個鋁制音圈骨架有足夠的通氣孔以消除內部空氣流動引起的噪音。音圈在低粘度磁液中運動,以得到大功率處理能力和簡化分頻器設計。堅固且具有最佳聽覺衰減的后腔允許27TDFC用于中等偏低分頻頻率?;遣AЦ志?,面板的設計提供了最佳的聲音輻射條件。關于各喇叭單元的詳細技術參數見數據表。

分頻器
這個分頻器是根據IJData的LspCAD設計的,目的就是在取得一個簡單的設計的同時又能保證整體品質的穩定。喇叭的頻率響應和阻抗特性是在消聲室里實際測試得出的,在距離音箱高音喇叭軸線1米的點、成15度角測量的。此參考點是用于在設計中盡量減少障板邊緣衍射的影響。通過測量喇叭的同一點,模擬出喇叭之間的相位響應之和。此分頻器是根據經驗設計的,并不局限于傳統理論的公式。
高音喇叭和低音喇叭應該與分頻點同步,當高音喇叭和低音喇叭相對于帶通水平都是在-6dB時分頻點的總和應該是平坦的。由于高音喇叭和低音喇叭有不同的靈敏度,為了達到統一的目的,就需要一個起衰減作用的2階高通濾波器。低通部分是由一個2階高通濾波器和一個同步補償電路實現的,由此可提供平穩的頻率響應。該同步補償電路是由一個電感和一個電阻并聯后再與喇叭串聯組成的。

測量結果
頻響曲線特性在距離音箱高音喇叭單元軸線1米的點、成15度角,電壓2.83V。
阻抗特性:電壓2V 。

從圖表中看到平均靈敏度是84 dB,響應在± 2dB之內。圖里的黑色曲線顯示了極性反向相連的高音喇叭響應。在這個曲線圖中,我們在分頻點周圍尋找一個深而對稱的凹口,這個凹口表明喇叭在分頻區域是同相的。這里,凹口有25dB以上深,證實了此系統擁有一良好的相位響應。藍色和綠色曲線分別地顯示了低音喇叭和高音喇叭的頻率響應。
2階分頻結合喇叭的自然滾降提供了4階林克維茨-萊利斜坡。分頻點是2.2KHz,足夠讓高音喇叭在其工作范圍內正常工作。同時低音喇叭的再生頻率范圍也不會超出設計值,從而提供平滑的頻率響應。Mimir(巨人)的離軸響應顯示如下。

這幅圖表明,頻率響應是非常平滑地貫穿整個頻率范圍和高音喇叭的受控離軸滾降。
下圖表明2階和3階諧波在1m處有96dB的輸出失真 。整體的失真非常低并且沒有任何顯著的峰值。這使得用這款套件組裝的音箱播放的音樂非常干凈且沒有音染。

更多資料請查閱//www.seas.no/

Download Mimir plans
Named after Mimir , a primal god of Norse mythology who was renowned for his knowledge and wisdom, we present
a new high-end two-way speaker kit.The Mimir consist of an 18 cm long throw woofer with a coated paper cone - CA18RNX , and a 27 mm coated fabric tweeter - 27TDFC .

Enclosure and stuffing
The Mimir loudspeaker is based on a standard 14 litre vented cabinet that is available assembled and finsihed at some DIY loudspeaker shops. This cabinet was chosen to give people an easy start to building a loudspeaker. Ask your local loudspeaker dealer if he can help you obtain this, if your not thinking of building it yourself. The important thing to remember when you are building this, is to keep the baffle width and internal volume of the original enclosure. Adding braces to stiffen the cabinet is a good tip for the advanced builder to take the loudspeaker just a little bit further.

The amount of stufing and port tuning is based on measurements and extensive listening. The cabinet is filled with 100 g of Acousto-Q. The stuffing is distributed evenly in the box, but kept away from the port opening to allow free movement of air. This to ensure that the airflow noise stays as low as possible. The port length is 20 cm including the flanged end and the inner diameter is 5 cm. This gives a port tuning of 42Hz providing a smooth low frequency roll-off.

Drive units
The woofer used in this system is the SEAS CA18RNX . This is a long throw 18 cm woofer with a coated paper cone. The classical coated paper cone gives a smooth extended frequency response with a controlled roll off. The large magnet system gives good transient response, and the bumped back plate together with the very long, and light weight copper clad aluminum voice coil allow for extreme coil excursion with low distortion. The extremely stiff and stable injection moulded metal basket, keeps the critical components in perfect alignment. Large windows in the basket both above and below the spider reduce sound reflection, air flow noise and cavity resonance to a minimum.

The tweeter is the SEAS 27TDFC . This is a 27 mm High Definition precoated fabric dome tweeter with a wide, soft polymer surround. The dome and surround materials give high consistency and excellent stability against variations in air humidity. The voice coil is wound on an aluminum voice coil former with adequate ventilating holes to eliminate noise from internal air flow. The voice coil is immersed in low viscosity magnetic fuid, for high power handling capacity and simplifed crossover design. A stiff and stable rear chamber with optimal acoustic damping allows 27TDFC to be used with moderately low crossover frequencies. The chassis is precision moulded from glass fibre reinforced plastic, and its front design offers optimum radiation conditions. For detailed technical parameters on the drive units see the data sheets.

Crossover
The crossover is designed in LspCAD from IJData, with the objective to obtain a simple design without sacrifcing the overall quality. Driver response and impedance were measured with the drivers mounted in the box at 1 metre distance 15 degrees off the tweeter axis in an anechoic room. This reference point was used in the design to minimize the influence of baffle edge diffraction. By measuring the drivers at the same point it is easy to simulate the summation of and phase response between the drivers. The crossover was developed empirically, without confinement to the traditional textbook filter formulas.

The drivers should be in phase at the crossover frequency, and the sum should be flat when both drivers are at -6dB relative to the pass band level. Now the inevitable vertical off-axis cancellation, which is always present with the use of non-coincident drivers, is at least outside the listening axis (tweeter axis). To accomplish the design goals it was necessary to use a 2nd order electrical filter for the high pass section, with an “l-pad” for attenuation because of the different sensitivities of the drivers. The low pass section was realised with a 2nd order electrical filter and a baffe-step compensator consisting of a parallel connection of an inductor and a resistor in series with the driver, thus providing a flat frequency response. The crossover schematics is shown in figure 2.



Measurements
Anechoic free field response at 1 meter, 15 degrees off tweeter axis, measured at 2.83V.
Impedance measured at 2V.



As seen in the figure the average sensitivity is 84dB and the response lies within ± 2dB. The black curve shows the response with the tweeter connected with opposite polarity. In this curve we look for a deep and symmetrical notch around the crossover frequency, which indicates that the drivers are in phase in the crossover region. Here the notch is more than 25dB deep, and that confirms that this system has a very good phase response. The blue and green curves show respectively the response of the woofer and the tweeter.

The 2nd order electrical crossover combinedwith the natural roll-off of the drivers gives a 4th order acoustical Linkwitz-Riley slope. The crossover frequency is 2.2 kHz, high enough for the tweeter to operate inside its limits, even at high amplitudes, and low enough so that the woofer doesn’t become too directional, and thus providing a smooth power respons. The off-axis respons of the Mimir is shown below.



This figure shows that the power response is very smooth throughout the whole frequency range, and the controlled off-axis roll off of the tweeter.

The next figure shows the 2nd and 3rd order harmonic distortion with an output of 96dB at 1m. The overall distortion is very low and without any peaks that might become noticeable. This makes the reproduced music very clean and without coloration.



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