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Sennheiser PXC250-B Noise Cancelling Headphones<p style="padding-left: 15px; padding-right: 15px;">The PXC 250 is a pair of closed, dynamic, supra-aural stereo mini headphones with NoiseGard&trade; active noise compensation. Due to their active and passive attenuation of ambient noise, they let you enjoy music even in noisy environments. The headphones are foldable and come with a convenient belt pouch, making them an ideal travel companion.</p><h5 style="padding-top: 10px;">Features</h5><ul style="padding-right: 15px;" class="list smallList"> <li>Dynamic stereo mini headphones</li> <li>Great for travel and outdoor use with mobile sources such as CD, MD or MP3 players</li> <li>Fold and flip: registered design allows the ear cups to be turned through 90&deg; and fold the headphones closed (headphones will lock in open and closed positions)</li> <li>For transport: supplied with soft belt pouch with extra pocket (185 x 105 x 40 mm)</li> <li>1.8 m Kevlar-reinforced OFC copper cable with 3.5 mm jack plug, delivered with an adaptor to 6.3 mm (1/4&rdquo;) stereo and 3.5 mm double mono (for airline audio)</li> <li>Ideal for use in coaches, trains etc.: soft ring ear pads with improved fit and closed ear cups ensure excellent passive attenuation of ambient noise (&ndash;15 to &ndash;25 dB for frequencies above 1,200 Hz)</li> <li>Ideal for aircraft and other environments with engine noise: the switchable NoiseGard&trade; active noise compensation attenuates frequencies below 1,000 Hz by up to &ndash;15 dB</li> <li>Impedance optimised for use in aircraft</li> <li>In-line NoiseGard&trade; power supply box (2 AAA size batteries) clips to the belt and can be rotated through 360&deg;</li> <li>For all types of modern music: detailed sound reproduction with a slight emphasis on the bass</li> <li>High-resolution sound due to Sennheiser &rdquo;Duofol&rdquo; diaphragms with spiral embossing (reduces and spreads eigenforms)</li> <li>Ultra-lightweight voice coils for high efficiency with portable players</li> <li>Adaptive baffle damping (patent pending)</li> <li>Bass tube for powerful, punchy bass</li> <li>Lightweight: only 65 g without cable</li> <li>Rugged and durable: robust steel headband with metal joints, steel-reinforced headband ends, connection to the ear cups tested for durability</li> <li>2-year guarantee</li></ul><h5>Delivery Includes</h5><ul style="padding-right: 15px;" class="list smallList"> <li>1 PXC 250</li> <li>1 belt pouch<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;">300 Ohm</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 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;">1,8 m</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;">65 g</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;">10.....21000 Hz</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;">106 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;">0,1 %</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_travel-line_004924?Open&amp;row=3#"><span class="linkGray">Nominal impedance</span></a></td> <td style="padding-left: 8px;">300 Ohm</td> </tr> <tr valign="top"> <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&quot; and &frac14;&quot; 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_travel-line_004924?Open&amp;row=3#"><span class="linkGray">Jack plug</span></a></td> <td style="padding-left: 8px;">3,5 mm stereo</td> </tr> <tr valign="top" bgcolor="#d9d9d9"> <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_travel-line_004924?Open&amp;row=3#"><span class="linkGray">Transducer principle</span></a></td> <td style="padding-left: 8px;">dynamic, closed</td> </tr> <tr valign="top"> <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_travel-line_004924?Open&amp;row=3#"><span class="linkGray">Ear coupling</span></a></td> <td style="padding-left: 8px;">supraaural</td> </tr> <tr valign="top" bgcolor="#d9d9d9"> <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_travel-line_004924?Open&amp;row=3#"><span class="linkGray">Cable length</span></a></td> <td style="padding-left: 8px;">1,8 m</td> </tr> <tr valign="top"> <td style="padding-left: 8px;">Weight w/o cable</td> <td style="padding-left: 8px;">65 g</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_travel-line_004924?Open&amp;row=3#"><span class="linkGray">Frequency response (headphones)</span></a></td> <td style="padding-left: 8px;">10.....21000 Hz</td> </tr> <tr valign="top"> <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. &lt;br&gt;')" href="http://www.sennheiser.com/sennheiser/home_en.nsf/root/private_headphones_travel-line_004924?Open&amp;row=3#"><span class="linkGray">Sound pressure level (SPL)</span></a></td> <td style="padding-left: 8px;">106 dB(SPL)</td> </tr> <tr valign="top" bgcolor="#d9d9d9"> <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 %.&lt;br&gt;&lt;br&gt;Example headphones:&lt;br&gt;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_travel-line_004924?Open&amp;row=3#"><span class="linkGray">THD, total harmonic distortion</span></a></td> <td style="padding-left: 8px;">0,1 %</td> </tr> </tbody> </table> </li></ul>
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Sennheiser PXC250-B Noise Cancelling Headphones

CODE: PXC 250-B


List price: $369.00  

Price: $299.00

You save: $70.00 (19%)
-19%

The PXC 250 is a pair of closed, dynamic, supra-aural stereo mini headphones with NoiseGard™ active noise compensation. Due to their active and passive attenuation of ambient noise, they let you enjoy music even in noisy environments. The headphones are foldable and come with a convenient belt pouch, making them an ideal travel companion.

Features
  • Dynamic stereo mini headphones
  • Great for travel and outdoor use with mobile sources such as CD, MD or MP3 players
  • Fold and flip: registered design allows the ear cups to be turned through 90° and fold the headphones closed (headphones will lock in open and closed positions)
  • For transport: supplied with soft belt pouch with extra pocket (185 x 105 x 40 mm)
  • 1.8 m Kevlar-reinforced OFC copper cable with 3.5 mm jack plug, delivered with an adaptor to 6.3 mm (1/4”) stereo and 3.5 mm double mono (for airline audio)
  • Ideal for use in coaches, trains etc.: soft ring ear pads with improved fit and closed ear cups ensure excellent passive attenuation of ambient noise (–15 to –25 dB for frequencies above 1,200 Hz)
  • Ideal for aircraft and other environments with engine noise: the switchable NoiseGard™ active noise compensation attenuates frequencies below 1,000 Hz by up to –15 dB
  • Impedance optimised for use in aircraft
  • In-line NoiseGard™ power supply box (2 AAA size batteries) clips to the belt and can be rotated through 360°
  • For all types of modern music: detailed sound reproduction with a slight emphasis on the bass
  • High-resolution sound due to Sennheiser ”Duofol” diaphragms with spiral embossing (reduces and spreads eigenforms)
  • Ultra-lightweight voice coils for high efficiency with portable players
  • Adaptive baffle damping (patent pending)
  • Bass tube for powerful, punchy bass
  • Lightweight: only 65 g without cable
  • Rugged and durable: robust steel headband with metal joints, steel-reinforced headband ends, connection to the ear cups tested for durability
  • 2-year guarantee
Delivery Includes
  • 1 PXC 250
  • 1 belt pouch

    Technical Data
    Nominal impedance 300 Ohm
    Jack plug 3,5 mm stereo
    Transducer principle dynamic, closed
    Ear coupling supraaural
    Cable length 1,8 m
    Weight w/o cable 65 g
    Frequency response (headphones) 10.....21000 Hz
    Sound pressure level (SPL) 106 dB(SPL)
    THD, total harmonic distortion 0,1 %