Log in
Register
Home
Forums
New posts
Search forums
What's new
New posts
New profile posts
Latest activity
News
Members
Current visitors
New profile posts
Search profile posts
Features
Log in
Register
Search
Search titles only
By:
Search titles only
By:
New posts
Search forums
Menu
Install the app
Install
Reply to thread
Home
Forums
Pro Audio
Junior Varsity
Feedback on sctive 18" sub + 3-way top combos. RCF v QSC v JBL v EV v Yamaha
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="Roy Andrews" data-source="post: 216670" data-attributes="member: 15263"><p>Just wanted to mention as a general comment for your future reference (none of the products you mentioned fall in this category):</p><p></p><p>Be VERY suspicious of ANY powered speaker advertising "Class D" power in the 800w to 1500W range built from about 2010 onwards including everything on the market today. Most of these speakers that I have had a chance to personally examine / repair are based on the TDA8953 / TDA8954 power amp on a chip. The chip is rated at 210watts per channel x2 @ 10% distortion, and on an amp dyno it can make about 160 watts x2 without notable distortion. It is usually run in bridge mono mode, so you are looking at around 320watts max. However, this isn't the worst part of the problem... after all, the "Bucket of Power" (BoP) used in QSC KW and original K series dynos at about 300 watts x2, and KW152's and KW153's can make your ears bleed and still sound clean. No, the real problem is that the TDA895x chips are dissipating 320 watts into an area less than the size of an American 10 cent coin. ANY break-down of the silicone heatsink grease, decoupling of the chip from the heatsink (happens a lot in EV ZLX series) or failure of (or in some cases, the complete lack of active cooling) can bring your show to a quick & unexpected end.</p><p></p><p>If I can buy a car stereo amp for a couple hundred bucks that dynos at 2000 watts or more, and is built using banks of discrete MOSFETs with more than sufficient cooling, then there is utterly no excuse for this level of chintz from famous sound reinforcement brands. </p><p></p><p>BTW, while QSC KW series & original K series are rated at this 1000w mark, I can confirm they use a discrete MOSFET design, as do the new, more powerful K.2 series. Unfortunately, I have yet to get a chance to disassemble or repair any of the other top tier products that you listed (live in a poor, 3rd world country, people don't buy quality here), but generally, once you get past the most exaggerated power ratings a company can invent for the TDA895x series of chips, then they are forced to use discrete MOSFET designs.</p><p></p><p>Good luck, and those pics look AWESOME. Have fun, be safe.</p></blockquote><p></p>
[QUOTE="Roy Andrews, post: 216670, member: 15263"] Just wanted to mention as a general comment for your future reference (none of the products you mentioned fall in this category): Be VERY suspicious of ANY powered speaker advertising "Class D" power in the 800w to 1500W range built from about 2010 onwards including everything on the market today. Most of these speakers that I have had a chance to personally examine / repair are based on the TDA8953 / TDA8954 power amp on a chip. The chip is rated at 210watts per channel x2 @ 10% distortion, and on an amp dyno it can make about 160 watts x2 without notable distortion. It is usually run in bridge mono mode, so you are looking at around 320watts max. However, this isn't the worst part of the problem... after all, the "Bucket of Power" (BoP) used in QSC KW and original K series dynos at about 300 watts x2, and KW152's and KW153's can make your ears bleed and still sound clean. No, the real problem is that the TDA895x chips are dissipating 320 watts into an area less than the size of an American 10 cent coin. ANY break-down of the silicone heatsink grease, decoupling of the chip from the heatsink (happens a lot in EV ZLX series) or failure of (or in some cases, the complete lack of active cooling) can bring your show to a quick & unexpected end. If I can buy a car stereo amp for a couple hundred bucks that dynos at 2000 watts or more, and is built using banks of discrete MOSFETs with more than sufficient cooling, then there is utterly no excuse for this level of chintz from famous sound reinforcement brands. BTW, while QSC KW series & original K series are rated at this 1000w mark, I can confirm they use a discrete MOSFET design, as do the new, more powerful K.2 series. Unfortunately, I have yet to get a chance to disassemble or repair any of the other top tier products that you listed (live in a poor, 3rd world country, people don't buy quality here), but generally, once you get past the most exaggerated power ratings a company can invent for the TDA895x series of chips, then they are forced to use discrete MOSFET designs. Good luck, and those pics look AWESOME. Have fun, be safe. [/QUOTE]
Insert quotes…
Verification
Post reply
Home
Forums
Pro Audio
Junior Varsity
Feedback on sctive 18" sub + 3-way top combos. RCF v QSC v JBL v EV v Yamaha
Top
Bottom
Sign-up
or
log in
to join the discussion today!