{"id":102432,"date":"2025-06-25T19:49:28","date_gmt":"2025-06-25T11:49:28","guid":{"rendered":"https:\/\/soundglory.com\/?post_type=product&p=102432"},"modified":"2026-03-04T15:28:00","modified_gmt":"2026-03-04T07:28:00","slug":"d150a-s-ii-power-amp","status":"publish","type":"product","link":"https:\/\/soundglory.com\/en\/product\/d150a-s-ii-power-amp\/","title":{"rendered":"Crown D150A S II POWER-AMP (\u4e8c\u624b\uff0c7\u6210\u65b0)"},"content":{"rendered":"
\n

Rated Output Power<\/strong><\/p>\n

8 \u03a9 Stereo<\/strong><\/p>\n

80 watts (19.03 dBW) minimum per channel \u00a0from 1\u00a0~\u00a020,000 Hz at 0.05% THD or less.<\/p>\n

95 WPC (19.78\u00a0dBW) on the back of the performance sheet or 90 WPC (19.54 dBW) in Crown’s manual at 1 kHz at 0.1% THD.<\/p>\n

You’ll see also that Crown elsewhere refers to rated power as 75 WPC (18.75 dBW), especially where it refers to sensitivity.<\/p>\n

 <\/p>\n

4 \u03a9 Stereo<\/strong><\/p>\n

125 watts (20.97\u00a0dBW) minimum from 1 ~ 20,000 Hz at 0.05% THD.<\/p>\n

145 to 155 WPC (21.61 ~ 21.90\u00a0dBW) at 1 kHz at 0.1% THD.<\/p>\n

 <\/p>\n

8 \u03a9 Mono<\/strong><\/p>\n

315 watts (24.98\u00a0dBW) at 1 kHz at 0.1% THD.<\/p>\n

 <\/p>\n

16 \u03a9 Mono<\/strong><\/p>\n

160 watts (22.04\u00a0dBW) minimum from 1 ~ 20,000 Hz at 0.05% THD.<\/p>\n

180 watts at 1 kHz at 0.1% THD.<\/p>\n

 <\/p>\n

Output Loads<\/strong><\/p>\n

4\u03a9, 8\u03a9 and 16\u03a9.<\/p>\n

Safe with any load, including shorts \u2014\u00a0open circuits and reactive loads \u2014\u00a0although it will kick-in its protection circuitry with 2\u03a9\u00a0loads.<\/p>\n

 <\/p>\n

Topology<\/strong><\/p>\n

It has a standard unregulated linear power supply with \u00b145V DC rails and dual 9,400 uF 50V capacitors, and an extra low-current 55V rail to help in biasing.<\/p>\n

Class A + AB.<\/p>\n

The drivers operate in class A at low levels. The output transistors don’t turn on until the output demand it, at which point they are class B. The drivers handle all the zero-crossings.<\/p>\n

Like almost all Crown linear amplifiers, it’s based on the\u00a01968 patent for the DC-300<\/a>, and you’ll see “patent number 3,493,879” on the back.<\/p>\n

There’s an operational amplifier at the front end, and the\u00a0IOC<\/strong>s light if the error output of this operational amplifier exceeds a certain value.<\/p>\n

 <\/p>\n

Input<\/strong><\/p>\n

Two mono \u00bc” unbalanced phone jacks, 25 k\u03a9 \u00b1 30%.<\/p>\n

The inputs feed 25 k\u03a9 potentiometers directly, whose outputs feeds the amplifier.<\/p>\n

 <\/p>\n

Input Sensitivity<\/strong><\/p>\n

1.19 V \u00b1 2% for rated power into 8\u03a9.<\/p>\n

Sad part is Crown never really comes out and tells us the rated power for this D-150A Series II version.<\/p>\n

Since its gain is 20.6x (26.28 dB), 1.19 V in gives us 24.514 V out, or 75 watts for rated power.<\/p>\n

There’s an internal jumper to increase the gain to 0.775 V sensitivity.<\/p>\n

 <\/p>\n

Frequency Response<\/strong><\/p>\n

DC ~ 20,000 Hz \u00b1 0.1 dB at 1 watt.<\/p>\n

DC ~ 100,000 Hz \u00b1 1 dB at 1 watt.<\/p>\n

 <\/p>\n

Phase Response<\/strong><\/p>\n

DC ~ 15,000 Hz, +0\u00ba -15\u00ba at 1 watt.<\/p>\n

 <\/p>\n

Signal to Noise Ratio<\/strong><\/p>\n

110 dB below “rated power” into 8\u03a9, 20-20,000 Hz measurement bandwidth.<\/p>\n

If you take rated power as 75 W (18.75 dBW), this means -91.25 dBW or 750 pW or 77.46\u00a0\u00b5V or -82.22 dBV of noise.<\/p>\n

If you take rated power as 80 W (19.03 dBW), this means -90.97 dBW or 800 pW or 80\u00a0\u00b5V or -81.94 dBV of noise.<\/p>\n

 <\/p>\n

THD<\/strong><\/p>\n

< 0.001% from 20 ~ 400 Hz, increasing linearly to 0.05% at 20,000 Hz at 80\u00a0W.<\/p>\n

 <\/p>\n

IMD<\/strong><\/p>\n

< 0.05% from 10 to 250 mW.<\/p>\n

<0.01% from 250 mW to 80 W.<\/p>\n

 <\/p>\n

Slew Rate<\/strong><\/p>\n

6 V\/\u00b5S.<\/p>\n

 <\/p>\n

Damping Factor & Output Impedance<\/strong><\/p>\n

> 400 damping factor into 8 \u03a9 from DC to 400 Hz.<\/p>\n

< 15 m\u03a9 in series with < 3 \u00b5H output source impedance.<\/p>\n

 <\/p>\n

Output Connectors<\/strong><\/p>\n

Lab standard 3\/4″ spaced 5-way binding posts.<\/p>\n

Designed for standard MDP lab connectors.<\/p>\n

 <\/p>\n

Quality<\/strong><\/p>\n

Made in Elkhart, Indiana, USA.<\/p>\n

 <\/p>\n

Power Input<\/strong><\/p>\n

120 VAC \u00b1 10%, 50 ~ 400 Hz.<\/p>\n

Internal taps also for 100 V, 200, 220 and 240 V (all \u00b1 10%).<\/p>\n

Red LED power light, although it looks amber when off.<\/p>\n

3-wire 5-foot captive cord.<\/p>\n

 <\/p>\n

Rated Power Consumption<\/strong><\/p>\n

Less than 40 W at idle, 750 W max.<\/p>\n

MDX 6.25A rear-panel fuse.<\/p>\n

See also\u00a0Actual Power Consumption.<\/p>\n

 <\/p>\n

Size<\/strong><\/p>\n

3 RU, 8″ deep measured.<\/p>\n

5.25 x 19 x 8.75″ HWD, depth is behind mounting flange.<\/p>\n

133 x 483 x 222 millimeters HWD, depth is behind mounting flange.<\/p>\n

 <\/p>\n

Weight<\/strong><\/p>\n

24 lbs. (10.9 kg).<\/p>\n<\/div>\n

<\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

Rated Output Power 8 \u03a9 Stereo 80 watts (19.03 dBW) minimum per channel \u00a0from 1\u00a0~\u00a020,000 Hz at 0.05% THD or less. 95 WPC (19.78\u00a0dBW) on…<\/p>\n","protected":false},"featured_media":102433,"template":"","meta":[],"pwb-brand":[],"product_cat":[502,524],"product_tag":[],"class_list":{"0":"post-102432","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-post-amplifier","7":"product_cat-used-equipmen-post-amplifier","8":"product_shipping_class-c-class","10":"first","11":"instock","12":"sold-individually","13":"shipping-taxable","14":"purchasable","15":"product-type-simple"},"aioseo_notices":[],"etheme_brands":{"errors":{"invalid_taxonomy":["Invalid taxonomy."]},"error_data":[]},"brands":[],"_links":{"self":[{"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product\/102432","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":2,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product\/102432\/revisions"}],"predecessor-version":[{"id":122709,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product\/102432\/revisions\/122709"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/media\/102433"}],"wp:attachment":[{"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/media?parent=102432"}],"wp:term":[{"taxonomy":"pwb-brand","embeddable":true,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/pwb-brand?post=102432"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product_cat?post=102432"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product_tag?post=102432"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}