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
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 Help
Wiring, Electrical & Installation
Cant seem to get the figures i want/need when setting up.
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="Hrp81134" data-source="post: 8680494" data-attributes="member: 677656"><p>Evening all. Think this is posted in the right place. I have come to the point in my build now where I'm setting amplifiers and avoiding clipping. However I cant seem to get more than 30.1v at 2amp output in the subwoofer amplifier. Details are as follows. I'm running inphase IPA2001D Amplifier with 15" T-rex subwoofer wired in 4ohm (dual 2 ohm). The head unit rca voltage going into amplifier is just under 0.5v before clipping on a 0db 35hz test tone. (Low I know but cheap head unit) the low crossover is set to 95hz on the amplifier with the subsonic cut off at 15hz. Bass boost is off with phase set to 0. Gain is roughly 3/4 up before clipping occurs however when I clamp positive supply to on coil of the sub when running the test tone I only get just under 2 amps at 30.1v across coil. It sounds loud enough but seems very underpowered to me figure wise. It's in a custom built 36hz ported enclosure at roughly 2.89ftcubed. Power supply to amplifier is perfect not dipping below 14.2v on 35hz burp at max volume (before clipping). Please help as I'm very confused. My only thoughts are up purchase a head unit with a 2-3v rca output before clipping as maybe the amp cant amplify 0.5v to the recommended RMS for subwoofer or am I missing something. Many thanks in advance...</p><p></p><p></p><p>Sub specs</p><ul> <li data-xf-list-type="ul">3000 watts 15' DVC subwoofer.</li> <li data-xf-list-type="ul">1000 watts <a href="https://www.caraudiocentre.co.uk/ajax-glossary.asp?id=63" target="_blank">RMS</a></li> <li data-xf-list-type="ul">Black powder finish die cast basket</li> <li data-xf-list-type="ul">Kevlar woven nonpress paper cone with EROM foam surround</li> <li data-xf-list-type="ul">3'” hi-temp 4-layer voice coil</li> <li data-xf-list-type="ul">Double stacked 200oz magnets</li> <li data-xf-list-type="ul">Mirror-image multi-layer nomex spiders</li> <li data-xf-list-type="ul">Chrome finished T-yoke with logo etched</li> <li data-xf-list-type="ul">Dual 2ohm <a href="https://www.caraudiocentre.co.uk/ajax-glossary.asp?id=16" target="_blank">impedance</a></li> <li data-xf-list-type="ul">Chrome push termianl</li> <li data-xf-list-type="ul">Rubber gasket</li> <li data-xf-list-type="ul">Rubber magnet boot</li> </ul><p>Amplifier specs</p><p></p><p><strong>Key Features: </strong></p><ul> <li data-xf-list-type="ul">800w RMS x1 @ 4 ohms</li> <li data-xf-list-type="ul">1200w RMS x1 @ 2 ohms</li> <li data-xf-list-type="ul">2000w RMS x1 @ 1 ohms</li> <li data-xf-list-type="ul">4000 Watts Max Power</li> <li data-xf-list-type="ul">Regulated power supply</li> <li data-xf-list-type="ul">MOSFET power supply</li> <li data-xf-list-type="ul">Oversize Power Tranformer</li> <li data-xf-list-type="ul">Bipolar Output devices</li> <li data-xf-list-type="ul">Dimensions (L x W x H) 320mm x 250mm x 55.5mm</li> <li data-xf-list-type="ul">Variable gain adjustment</li> <li data-xf-list-type="ul">Variable cross over (high/low pass)</li> <li data-xf-list-type="ul">Thermal protection</li> <li data-xf-list-type="ul">Overload protection</li> <li data-xf-list-type="ul">1 ohms Stable</li> <li data-xf-list-type="ul">Variable Subsonic Filter 20Hz- 50Hz</li> <li data-xf-list-type="ul">Low pass filter frequency 50Hz - 250Hz</li> <li data-xf-list-type="ul">Digital Subwoofer Level Control</li> <li data-xf-list-type="ul">Bass Boost</li> </ul></blockquote><p></p>
[QUOTE="Hrp81134, post: 8680494, member: 677656"] Evening all. Think this is posted in the right place. I have come to the point in my build now where I'm setting amplifiers and avoiding clipping. However I cant seem to get more than 30.1v at 2amp output in the subwoofer amplifier. Details are as follows. I'm running inphase IPA2001D Amplifier with 15" T-rex subwoofer wired in 4ohm (dual 2 ohm). The head unit rca voltage going into amplifier is just under 0.5v before clipping on a 0db 35hz test tone. (Low I know but cheap head unit) the low crossover is set to 95hz on the amplifier with the subsonic cut off at 15hz. Bass boost is off with phase set to 0. Gain is roughly 3/4 up before clipping occurs however when I clamp positive supply to on coil of the sub when running the test tone I only get just under 2 amps at 30.1v across coil. It sounds loud enough but seems very underpowered to me figure wise. It's in a custom built 36hz ported enclosure at roughly 2.89ftcubed. Power supply to amplifier is perfect not dipping below 14.2v on 35hz burp at max volume (before clipping). Please help as I'm very confused. My only thoughts are up purchase a head unit with a 2-3v rca output before clipping as maybe the amp cant amplify 0.5v to the recommended RMS for subwoofer or am I missing something. Many thanks in advance... Sub specs [LIST] [*]3000 watts 15' DVC subwoofer. [*]1000 watts [URL='https://www.caraudiocentre.co.uk/ajax-glossary.asp?id=63']RMS[/URL] [*]Black powder finish die cast basket [*]Kevlar woven nonpress paper cone with EROM foam surround [*]3'” hi-temp 4-layer voice coil [*]Double stacked 200oz magnets [*]Mirror-image multi-layer nomex spiders [*]Chrome finished T-yoke with logo etched [*]Dual 2ohm [URL='https://www.caraudiocentre.co.uk/ajax-glossary.asp?id=16']impedance[/URL] [*]Chrome push termianl [*]Rubber gasket [*]Rubber magnet boot [/LIST] Amplifier specs [B]Key Features: [/B] [LIST] [*]800w RMS x1 @ 4 ohms [*]1200w RMS x1 @ 2 ohms [*]2000w RMS x1 @ 1 ohms [*]4000 Watts Max Power [*]Regulated power supply [*]MOSFET power supply [*]Oversize Power Tranformer [*]Bipolar Output devices [*]Dimensions (L x W x H) 320mm x 250mm x 55.5mm [*]Variable gain adjustment [*]Variable cross over (high/low pass) [*]Thermal protection [*]Overload protection [*]1 ohms Stable [*]Variable Subsonic Filter 20Hz- 50Hz [*]Low pass filter frequency 50Hz - 250Hz [*]Digital Subwoofer Level Control [*]Bass Boost [/LIST] [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Car Audio Help
Wiring, Electrical & Installation
Cant seem to get the figures i want/need when setting up.
Top
Menu
Home
Refresh