Menu
Forum
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Car Audio Discussion
General Car Audio
Car Audio Build Logs
Car Audio Equipment
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Help
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Car Audio Classifieds
Car Audio Wanted
Classifieds Member Feedback
Gallery
New media
New comments
Search media
SHOP
Shop Head Units
Shop Amplifiers
Shop Speakers
Shop Subwoofers
Shop eBay Car Audio
Log in / Join
Test
Forum
Search
Search titles only
Search titles only
Log in / Join
Search
Search titles only
Search titles only
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Menu
Reply to thread
Forum
Car Audio Equipment
Amplifiers
Class A--B amps
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="squeak9798" data-source="post: 3684993" data-attributes="member: 555320"><p>They had some that were labeled "class A", but it was simply a class A/B amplifier. For example, the 50 II is labeled in their literature as being a "pure class A".....but it's idle current draw is only 1.5A. On 14.4V with that current draw, and assuming the maximum efficiency class A operation can have of 25%....that means it's limited to a maximum [under ideal conditions] "class A" power output of 5.4w (total, so 2.7w per channel). Anything above and beyond that (it's rated 25w x 2 @ 4ohm) is class B.</p><p></p><p>To my knowledge, the ONLY pure class A amplifier for car audio is the HSS Fidelity tube amplifier. Only a class A output stage.</p><p></p><p>Every other car audio amplifier labeled as "class A" has been a class A/B amplifier, some with a higher bias (such as the Tru A class amplifier).....but all of them at a certain power level will switch to class "B" operation. Monolithics included.</p></blockquote><p></p>
[QUOTE="squeak9798, post: 3684993, member: 555320"] They had some that were labeled "class A", but it was simply a class A/B amplifier. For example, the 50 II is labeled in their literature as being a "pure class A".....but it's idle current draw is only 1.5A. On 14.4V with that current draw, and assuming the maximum efficiency class A operation can have of 25%....that means it's limited to a maximum [under ideal conditions] "class A" power output of 5.4w (total, so 2.7w per channel). Anything above and beyond that (it's rated 25w x 2 @ 4ohm) is class B. To my knowledge, the ONLY pure class A amplifier for car audio is the HSS Fidelity tube amplifier. Only a class A output stage. Every other car audio amplifier labeled as "class A" has been a class A/B amplifier, some with a higher bias (such as the Tru A class amplifier).....but all of them at a certain power level will switch to class "B" operation. Monolithics included. [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Car Audio Equipment
Amplifiers
Class A--B amps
Top
Menu
Home
Refresh