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Sennheiser HD 25-II

Sennheiser HD 25-II

<p style="padding-left: 15px; padding-right: 15px;">The closed-back HD 25-1 IIs are purpose-designed, professional monitoring headphones offering high attenuation of background noise. Capable of handling very high sound pressure levels and of extremely robust construction, these headphones perform exceptionally well in high-noise environments, e.g. ENG, sound reinforcement, studio monitoring and audio equipment testing. The capsule is rotatable for one-ear listening. Ideal monitoring headphones for cameramen and DJs.</p><h5 style="padding-top: 10px;">Features</h5><ul style="padding-right: 15px;" class="list smallList"> <li>Very lightweight and comfortable, even if used for long periods</li> <li>High maximum sound pressure level</li> <li>65 .nominal impedance for universal compatibility</li> <li>Tough, detachable steel cable</li> <li>Neodymium ferrous magnet systems and lightweight aluminium/copper voice</li></ul><h5>Delivery Includes</h5><ul style="padding-right: 15px;" class="list smallList"> <li>1 HD 25-1 II</li> <li>1 Bag</li> <li>Soft ear pads (1 pair)</li> <li>1 adaptor to ¼” (6.3 mm) stereo jack plug<br /> <br /> <h5 style="padding-left: 8px;">Technical Data</h5> <script language="JavaScript" type="text/javascript"> tmpGlossar = get_glossarData("Nominal impedance") ; tmpText = '' ; tmpText += '<tr valign=top' + ( techRow % 2 ? ' bgcolor=#D9D9D9' : '' ) + '>'; tmpText += '<td style="padding-left:8px;">' + ( ( tmpGlossar == '' ) ? 'Nominal impedance' : '<a href="#" onMouseover="showTooltip(this,event,''+tmpGlossar+'')" onMouseout="hideTooltip()"><span class="linkGray">Nominal impedance</span></a>' ) + '</td><td style="padding-left:8px;">70 Ohm</td>' ; tmpText += '</tr>' ; document.write ( tmpText ) ;techRow++; tmpGlossar = get_glossarData("Load rating") ; tmpText = '' ; tmpText += '<tr valign=top' + ( techRow % 2 ? ' bgcolor=#D9D9D9' : '' ) + '>'; tmpText += '<td style="padding-left:8px;">' + ( ( tmpGlossar == '' ) ? 'Load rating' : '<a href="#" onMouseover="showTooltip(this,event,''+tmpGlossar+'')" onMouseout="hideTooltip()"><span class="linkGray">Load rating</span></a>' ) + '</td><td style="padding-left:8px;">0.2 W</td>' ; tmpText += '</tr>' ; document.write ( tmpText ) ;techRow++; tmpGlossar = get_glossarData("Contact pressure") ; tmpText = '' ; tmpText += '<tr valign=top' + ( techRow % 2 ? ' bgcolor=#D9D9D9' : '' ) + '>'; tmpText += '<td style="padding-left:8px;">' + ( ( tmpGlossar == '' ) ? 'Contact pressure' : '<a href="#" onMouseover="showTooltip(this,event,''+tmpGlossar+'')" onMouseout="hideTooltip()"><span class="linkGray">Contact pressure</span></a>' ) + '</td><td style="padding-left:8px;">ca. 2.5 N</td>' ; tmpText += '</tr>' ; document.write ( tmpText ) ;techRow++; tmpGlossar = get_glossarData("Weight w/o cable") ; tmpText = '' ; tmpText += '<tr valign=top' + ( techRow % 2 ? ' bgcolor=#D9D9D9' : '' ) + '>'; tmpText += '<td style="padding-left:8px;">' + ( ( tmpGlossar == '' ) ? 'Weight w/o cable' : '<a href="#" onMouseover="showTooltip(this,event,''+tmpGlossar+'')" onMouseout="hideTooltip()"><span class="linkGray">Weight w/o cable</span></a>' ) + '</td><td style="padding-left:8px;">ca. 140 g</td>' ; tmpText += '</tr>' ; document.write ( tmpText ) ;techRow++; tmpGlossar = get_glossarData("Jack plug") ; tmpText = '' ; tmpText += '<tr valign=top' + ( techRow % 2 ? ' bgcolor=#D9D9D9' : '' ) + '>'; tmpText += '<td style="padding-left:8px;">' + ( ( tmpGlossar == '' ) ? 'Jack plug' : '<a href="#" onMouseover="showTooltip(this,event,''+tmpGlossar+'')" onMouseout="hideTooltip()"><span class="linkGray">Jack plug</span></a>' ) + '</td><td style="padding-left:8px;">3,5/6,3 mm stereo</td>' ; tmpText += '</tr>' ; document.write ( tmpText ) ;techRow++; tmpGlossar = get_glossarData("Transducer principle") ; tmpText = '' ; tmpText += '<tr valign=top' + ( techRow % 2 ? ' bgcolor=#D9D9D9' : '' ) + '>'; tmpText += '<td style="padding-left:8px;">' + ( ( tmpGlossar == '' ) ? 'Transducer principle' : '<a href="#" onMouseover="showTooltip(this,event,''+tmpGlossar+'')" onMouseout="hideTooltip()"><span class="linkGray">Transducer principle</span></a>' ) + '</td><td style="padding-left:8px;">dynamic, closed</td>' ; tmpText += '</tr>' ; document.write ( tmpText ) ;techRow++; tmpGlossar = get_glossarData("Ear coupling") ; tmpText = '' ; tmpText += '<tr valign=top' + ( techRow % 2 ? ' bgcolor=#D9D9D9' : '' ) + '>'; tmpText += '<td style="padding-left:8px;">' + ( ( tmpGlossar == '' ) ? 'Ear coupling' : '<a href="#" onMouseover="showTooltip(this,event,''+tmpGlossar+'')" onMouseout="hideTooltip()"><span class="linkGray">Ear coupling</span></a>' ) + '</td><td style="padding-left:8px;">supraaural</td>' ; tmpText += '</tr>' ; document.write ( tmpText ) ;techRow++; tmpGlossar = get_glossarData("Cable length") ; tmpText = '' ; tmpText += '<tr valign=top' + ( techRow % 2 ? ' bgcolor=#D9D9D9' : '' ) + '>'; tmpText += '<td style="padding-left:8px;">' + ( ( tmpGlossar == '' ) ? 'Cable length' : '<a href="#" onMouseover="showTooltip(this,event,''+tmpGlossar+'')" onMouseout="hideTooltip()"><span class="linkGray">Cable length</span></a>' ) + '</td><td style="padding-left:8px;">1,5 m</td>' ; tmpText += '</tr>' ; document.write ( tmpText ) ;techRow++; tmpGlossar = get_glossarData("Sound pressure level (SPL)") ; tmpText = '' ; tmpText += '<tr valign=top' + ( techRow % 2 ? ' bgcolor=#D9D9D9' : '' ) + '>'; tmpText += '<td style="padding-left:8px;">' + ( ( tmpGlossar == '' ) ? 'Sound pressure level (SPL)' : '<a href="#" onMouseover="showTooltip(this,event,''+tmpGlossar+'')" onMouseout="hideTooltip()"><span class="linkGray">Sound pressure level (SPL)</span></a>' ) + '</td><td style="padding-left:8px;">120 dB(SPL)</td>' ; tmpText += '</tr>' ; document.write ( tmpText ) ;techRow++; tmpGlossar = get_glossarData("THD, total harmonic distortion") ; tmpText = '' ; tmpText += '<tr valign=top' + ( techRow % 2 ? ' bgcolor=#D9D9D9' : '' ) + '>'; tmpText += '<td style="padding-left:8px;">' + ( ( tmpGlossar == '' ) ? 'THD, total harmonic distortion' : '<a href="#" onMouseover="showTooltip(this,event,''+tmpGlossar+'')" onMouseout="hideTooltip()"><span class="linkGray">THD, total harmonic distortion</span></a>' ) + '</td><td style="padding-left:8px;">< 0,3 %</td>' ; tmpText += '</tr>' ; document.write ( tmpText ) ;techRow++; tmpGlossar = get_glossarData("Frequency response (headphones)") ; tmpText = '' ; tmpText += '<tr valign=top' + ( techRow % 2 ? ' bgcolor=#D9D9D9' : '' ) + '>'; tmpText += '<td style="padding-left:8px;">' + ( ( tmpGlossar == '' ) ? 'Frequency response (headphones)' : '<a href="#" onMouseover="showTooltip(this,event,''+tmpGlossar+'')" onMouseout="hideTooltip()"><span class="linkGray">Frequency response (headphones)</span></a>' ) + '</td><td style="padding-left:8px;">16.....22000 Hz</td>' ; tmpText += '</tr>' ; document.write ( tmpText ) ;techRow++; </script> <table width="530" cellspacing="0" cellpadding="3" border="0"> <tbody> <tr valign="top" bgcolor="#d9d9d9"> <td style="padding-left: 8px;"><a onmouseout="hideTooltip()" onmouseover="showTooltip(this,event,'Impedance expresses the AC resistance of a microphone or a set of headphones. It is dependent on frequency and is given at 1 kHz as the so-called nominal impedance. Impedance is measured in ohms. In recent years, an industrial standard has developed, setting the impedance of headphones at 50 or 600 ohms. Sennheiser headphones are manufactured according to this standard, thus practically ruling out connection problems. With microphones, the input impedance of the following microphone amplifier should have at least three times the value of the nominal impedance, in order to prevent it from unnecessarily attenuating the microphone signal.')" href="http://www.sennheiser.com/sennheiser/home_en.nsf/root/private_headphones_dj-headphones_502188?Open&row=3#"><span class="linkGray">Nominal impedance</span></a></td> <td style="padding-left: 8px;">70 Ohm</td> </tr> <tr valign="top"> <td style="padding-left: 8px;"><a onmouseout="hideTooltip()" onmouseover="showTooltip(this,event,'The load rating is the amount of electric power which - according to the manufacturer´s specifications - can be continuously supplied to a set of headphones over a period of time without causing damage. According to DIN 45500 Part 10, the load rating must be at least 100 mW. Testing is carried out using a special noise signal which is supplied to the headphones over a period of 100 hours.')" href="http://www.sennheiser.com/sennheiser/home_en.nsf/root/private_headphones_dj-headphones_502188?Open&row=3#"><span class="linkGray">Load rating</span></a></td> <td style="padding-left: 8px;">0.2 W</td> </tr> <tr valign="top" bgcolor="#d9d9d9"> <td style="padding-left: 8px;"><a onmouseout="hideTooltip()" onmouseover="showTooltip(this,event,'The wearing comfort of a set of headphones is determined not only by its weight but also by the force with which the earpieces are pressed onto the ears. This force is given in newtons (N), whereby 1 N corresponds to the compressive force which a mass of about 100 g exerts on a solid surface. The DIN Standard 45500 Part 10 limits the maximum permissible contact force to 5 N. Values of between 1.3 and 4 N are common, although lower values apply for open headphones. Higher values can be found in the case of closed headphones. Here, a higher contact pressure is required in order to achieve sufficient sealing, which is important for the reproduction of low frequencies.')" href="http://www.sennheiser.com/sennheiser/home_en.nsf/root/private_headphones_dj-headphones_502188?Open&row=3#"><span class="linkGray">Contact pressure</span></a></td> <td style="padding-left: 8px;">ca. 2.5 N</td> </tr> <tr valign="top"> <td style="padding-left: 8px;">Weight w/o cable</td> <td style="padding-left: 8px;">ca. 140 g</td> </tr> <tr valign="top" bgcolor="#d9d9d9"> <td style="padding-left: 8px;"><a onmouseout="hideTooltip()" onmouseover="showTooltip(this,event,'A common audio connector in consumer electronics and music industry. Available in various diameters; in the hi-fi segment, 1/8" and ¼" are widely used. Poles range from one to four. (Examples: headphone jack or jack of an electric guitar).')" href="http://www.sennheiser.com/sennheiser/home_en.nsf/root/private_headphones_dj-headphones_502188?Open&row=3#"><span class="linkGray">Jack plug</span></a></td> <td style="padding-left: 8px;">3,5/6,3 mm stereo</td> </tr> <tr valign="top"> <td style="padding-left: 8px;"><a onmouseout="hideTooltip()" onmouseover="showTooltip(this,event,'Two transducer principles have become established for the conversion of electric energy into mechanical energy: electrodynamic and electrostatic transducers, whereby the latter is only to be found in audiophile systems, due to their relatively high manufacturing costs. Electrodynamic transducers basically consist of a ring-shaped permanent magnet and an oscillation coil, which is fixed to the receiver diaphragm. When an audio-frequency alternating current is passed through the oscillation coil, it is caused to vibrate in accordance with the audio-frequency alternating current, thus causing the diaphragm to vibrate in the same way.')" href="http://www.sennheiser.com/sennheiser/home_en.nsf/root/private_headphones_dj-headphones_502188?Open&row=3#"><span class="linkGray">Transducer principle</span></a></td> <td style="padding-left: 8px;">dynamic, closed</td> </tr> <tr valign="top" bgcolor="#d9d9d9"> <td style="padding-left: 8px;"><a onmouseout="hideTooltip()" onmouseover="showTooltip(this,event,'A distinction is made between headphones which are worn on the external ear (supra-aural) and those which surround the ear (circumaural). Open headphones have foam ear pads that rest on the ears or ring pads that surround the ears. Closed headphones, on the other hand, nearly always have circumaural ear pads.')" href="http://www.sennheiser.com/sennheiser/home_en.nsf/root/private_headphones_dj-headphones_502188?Open&row=3#"><span class="linkGray">Ear coupling</span></a></td> <td style="padding-left: 8px;">supraaural</td> </tr> <tr valign="top"> <td style="padding-left: 8px;"><a onmouseout="hideTooltip()" onmouseover="showTooltip(this,event,'The cable length is usually measured between the anti-kink sleeves of the cable (cable length without connectors).')" href="http://www.sennheiser.com/sennheiser/home_en.nsf/root/private_headphones_dj-headphones_502188?Open&row=3#"><span class="linkGray">Cable length</span></a></td> <td style="padding-left: 8px;">1,5 m</td> </tr> <tr valign="top" bgcolor="#d9d9d9"> <td style="padding-left: 8px;"><a onmouseout="hideTooltip()" onmouseover="showTooltip(this,event,'Due to the impractical numerical values, the sound pressure is usually given as the logarithmic value of the sound pressure level according to the equation: dB SPL = 20 x log (po / 0.00002 Pa). The abbreviation SPL (sound pressure level) is added in order to make a clear distinction from other uses of dB. The reference sound pressure, which is at the same time the threshold of hearing, is then 0 dB SPL. The threshold of pain is 140 dB SPL. A difference in the sound pressure level of 1 dB is just about perceptible, while a doubling of the sound pressure corresponds to 6 dB and a doubling of the volume corresponds to a rise of 10 dB. <br>')" href="http://www.sennheiser.com/sennheiser/home_en.nsf/root/private_headphones_dj-headphones_502188?Open&row=3#"><span class="linkGray">Sound pressure level (SPL)</span></a></td> <td style="padding-left: 8px;">120 dB(SPL)</td> </tr> <tr valign="top"> <td style="padding-left: 8px;"><a onmouseout="hideTooltip()" onmouseover="showTooltip(this,event,'Total harmonic distortion is a measure of non-linear harmonic distortion and is given in %.<br><br>Example headphones:<br>Non-linear harmonic distortions are signals which were not present in the original before the signal was converted by the headphones. These unwanted signals are caused by the diaphragm, whose movements do not precisely move in time with the electric signals that cause it to move. Unfortunately, this is a feature of all electroacoustic transducers. Although it cannot be completely eliminated, suitable steps can be taken to minimise it. However, the user is not interested in why this distortion takes place but in how great the level of distortion must be for it to become perceptible. According to the findings of several research projects, a total harmonic distortion of 1% in the frequency range of 100 to 2000 Hz is imperceptible. Below 100 Hz, the perceptibility threshold lies at 10%.')" href="http://www.sennheiser.com/sennheiser/home_en.nsf/root/private_headphones_dj-headphones_502188?Open&row=3#"><span class="linkGray">THD, total harmonic distortion</span></a></td> <td style="padding-left: 8px;">< 0,3 %</td> </tr> <tr valign="top" bgcolor="#d9d9d9"> <td style="padding-left: 8px;"><a onmouseout="hideTooltip()" onmouseover="showTooltip(this,event,'The frequency response of a pair of headphones is given within limits defined by the manufacturer.')" href="http://www.sennheiser.com/sennheiser/home_en.nsf/root/private_headphones_dj-headphones_502188?Open&row=3#"><span class="linkGray">Frequency response (headphones)</span></a></td> <td style="padding-left: 8px;">16.....22000 Hz</td> </tr> </tbody> </table> </li></ul>
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Sennheiser HD 25-II

CODE: HD 25 II

List price: ~~$599.00~~

Price: $399.00

You save: $200.00 (33%)

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The closed-back HD 25-1 IIs are purpose-designed, professional monitoring headphones offering high attenuation of background noise. Capable of handling very high sound pressure levels and of extremely robust construction, these headphones perform exceptionally well in high-noise environments, e.g. ENG, sound reinforcement, studio monitoring and audio equipment testing. The capsule is rotatable for one-ear listening. Ideal monitoring headphones for cameramen and DJs.

Features

Very lightweight and comfortable, even if used for long periods
High maximum sound pressure level
65 .nominal impedance for universal compatibility
Tough, detachable steel cable
Neodymium ferrous magnet systems and lightweight aluminium/copper voice

Delivery Includes

1 HD 25-1 II
1 Bag
Soft ear pads (1 pair)

1 adaptor to ¼” (6.3 mm) stereo jack plug

Technical Data

Nominal impedance	70 Ohm
Load rating	0.2 W
Contact pressure	ca. 2.5 N
Weight w/o cable	ca. 140 g
Jack plug	3,5/6,3 mm stereo
Transducer principle	dynamic, closed
Ear coupling	supraaural
Cable length	1,5 m
Sound pressure level (SPL)	120 dB(SPL)
THD, total harmonic distortion	< 0,3 %
Frequency response (headphones)	16.....22000 Hz

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