{"id":129373,"date":"2026-03-02T16:22:13","date_gmt":"2026-03-02T08:22:13","guid":{"rendered":"https:\/\/soundglory.com\/product\/pass-labs-hpa-1-a-%e9%a1%9e-headphone-amplifier\/"},"modified":"2026-08-27T20:31:39","modified_gmt":"2026-08-27T12:31:39","slug":"pass-labs-hpa-1-a-%e9%a1%9e-headphone-amplifier","status":"publish","type":"product","link":"https:\/\/soundglory.com\/en\/product\/pass-labs-hpa-1-a-%e9%a1%9e-headphone-amplifier\/","title":{"rendered":"PASS LABS <br\/>HPA-1 CLASS A HEADPHONE AMPLIFIER"},"content":{"rendered":"<h3>HPA-1<\/h3>\n<p>HPA-1 headphone amplifier was designed from the outset to be one of the best-sounding headphone amplifiers on the market. With its low feedback, wide bandwidth, and direct-coupled MOSFET output stage, this musical powerhouse effortlessly, powerfully, and elegantly drives even the most demanding headphone loads. HPA-1 can also be used as a line-level preamplifier, delivering sound quality comparable to higher-priced counterparts. Real-world testing shows excellent power output and exceptional sound quality.<\/p>\n<p>Technical Specifications<\/p>\n<p>Gain (dB): 8 dB<br \/>\nFrequency Response: 10 Hz \u2013 100 K &#8211; 1 dB<br \/>\nOutput Power under 20 Ohm Load: 3500 mW<br \/>\nTotal Harmonic Distortion Plus Noise: 0.005300 ohms at 1 V output<br \/>\nOutput Power under Load: 200 mW (H): 27.94 x 34.29 x 10.16 cm &lt; <br \/>Weight: 6.35 kg<\/p>\n<div style=\"margin: 20px 0;\"><div class=\"qrcswholewtapper\" style=\"text-align:left;\"><div class=\"qrcprowrapper\"  id=\"qrcwraa2leds\"><div class=\"qrc_canvass\" id=\"qrc_cuttenpages_2\" style=\"display:inline-block\" data-text=\"https:\/\/soundglory.com\/en\/product\/pass-labs-hpa-1-a-%e9%a1%9e-headphone-amplifier\/\"><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>HPA-1 HPA-1 headphone amplifier was designed from the outset to be one of the best-sounding headphone amplifiers on the market. With its low feedback, wide&#8230;<\/p>\n","protected":false},"featured_media":124163,"template":"","meta":[],"pwb-brand":[10856],"product_cat":[10460,10485,11086],"product_tag":[],"class_list":{"0":"post-129373","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"pwb-brand-pass-labs","7":"product_cat-headphone-amplifier","8":"product_cat-ear-amplifier","9":"product_cat-pass-labs-headphone-amplifier","10":"product_shipping_class-c-class","12":"first","13":"onbackorder","14":"shipping-taxable","15":"purchasable","16":"product-type-simple"},"aioseo_notices":[],"etheme_brands":{"errors":{"invalid_taxonomy":["Invalid taxonomy."]},"error_data":[]},"brands":[{"id":10856,"name":"PASS LABS","slug":"pass-labs"}],"_links":{"self":[{"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product\/129373","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/types\/product"}],"version-history":[{"count":1,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product\/129373\/revisions"}],"predecessor-version":[{"id":129386,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product\/129373\/revisions\/129386"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/media\/124163"}],"wp:attachment":[{"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/media?parent=129373"}],"wp:term":[{"taxonomy":"pwb-brand","embeddable":true,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/pwb-brand?post=129373"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product_cat?post=129373"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product_tag?post=129373"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}