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Adjusting Amps For Dummies (Me) Long
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<blockquote data-quote="2therock" data-source="post: 34599" data-attributes="member: 543386"><p>I'm over my head here. Please throw me a line?</p><p></p><p>I hope I can take advantage of your expertise with this one long message? Maybe others here can lean from your answer.</p><p></p><p>I have a Alpine CDA-7894 head unit. I can turn off the internal amp. It has all sorts of adjustment tweaks available. (See Below).</p><p></p><p>I have an Alpine 5 Cahnnel 40 x 4 RMS (Benchmarked @ 50+ Continus), 120 X 1. 75 X 4 X 180 MAX Amp with a few adjustments.(See Below)</p><p></p><p>I have Cerwin Vega HED Series 6.5" Components (Front) and Cerwin Vega HED Series 4x6 Plates (Rear). They max at 100Watts.</p><p></p><p>And JL Audio's lovley little 8.1 micro sub aimed at the floor under the rear seat of my Chevy 2k2 Ext Cab.</p><p></p><p>My Alpine AMP only has 3 Gain knobs (1 of them is for the sub channel), a LP filter knob, 2 HP Filter switches, a bass boost switch and a LP Filter knob.</p><p></p><p>The Alpine CDA-7894 radio has cross over settings in the menu. Here They Are:</p><p></p><p>Bass Center Frequency (Selectable) : 60Hz, 70Hz, 80Hz, 90Hz, 100Hz, 130Hz, 150Hz, 180Hz</p><p></p><p>Bass Level Control Range : ±14dB at 60Hz (2dB steps)</p><p></p><p>Bass Width Adjustment (Q) : 4 Choices (1= Wide, 4=Narrow)</p><p></p><p>Crossover Type : Independent HP/LP (2-Way) Analog</p><p></p><p>High Pass Crossover Frequency (Selectable) : Off, 80Hz, 120Hz, 160Hz</p><p></p><p>Low Pass Crossover Frequency (Selectable) : Off, 80Hz, 120Hz, 160Hz</p><p></p><p>Treble Center Frequency (Selectable) : 10.0kHz, 12.5kHz, 15.0kHz, 17.5kHz</p><p></p><p>Treble Level Control Range : ±14dB at 10.0kHz (2dB Steps)</p><p></p><p>Here is a question. My Cerwin Vega Components and plates have fixed cross overs on them! Will these defeat my radio cross over controls? Will they be butting heads? Do I select the HP filters to "On"?</p><p></p><p>Here is my amp specs.</p><p></p><p>• Max Power (EIAJ) 75W x 4 + 180W (4ohm; Stereo) 180W x 2 + 180W x 1 (Bridged 4ohm<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p></p><p>• 14.4V RMS Continuous Power 4ohm; Stereo (0.08% THD) 40W x 4 + (0.3% THD)120W x 1(4ohm<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> 2ohm; Stereo (0.3% THD) 50W x 4 + (0.3% THD)120W x 1(4ohm<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> Bridged 4ohm; (0.3% THD) 100W x 2 + 120W x 1</p><p></p><p>• S/N Ratio 100 dBA</p><p></p><p>• Bass Engine©</p><p></p><p>• Bass Boost</p><p></p><p>• 18dB LP (50-200Hz) &amp; 18dB HP (80Hz) Crossover</p><p></p><p>• 18dB LP (50-200Hz) &amp; HP (80Hz) Crossovers</p><p></p><p>• 4 Volt Input Capability</p><p></p><p>• STAR Topology &amp; Duo-B Circuitry</p><p></p><p>• Darlington Bi-Polar Outputs</p><p></p><p>• MOSFET Power Supply</p><p></p><p>Please suggest where you would start at.</p><p></p><p>I told you guys I was a newbee. I am pulling my hair out trying to keep figure out how to get the best of what I have.</p><p></p><p>I do know that one needs to set the gains first. Turn them down, the radio up, increase the gain untill there is minimal distrition, then take the gain down until it smooths out?</p><p></p><p>Talk to me Cuzz!</p><p></p><p>2therock</p></blockquote><p></p>
[QUOTE="2therock, post: 34599, member: 543386"] I'm over my head here. Please throw me a line? I hope I can take advantage of your expertise with this one long message? Maybe others here can lean from your answer. I have a Alpine CDA-7894 head unit. I can turn off the internal amp. It has all sorts of adjustment tweaks available. (See Below). I have an Alpine 5 Cahnnel 40 x 4 RMS (Benchmarked @ 50+ Continus), 120 X 1. 75 X 4 X 180 MAX Amp with a few adjustments.(See Below) I have Cerwin Vega HED Series 6.5" Components (Front) and Cerwin Vega HED Series 4x6 Plates (Rear). They max at 100Watts. And JL Audio's lovley little 8.1 micro sub aimed at the floor under the rear seat of my Chevy 2k2 Ext Cab. My Alpine AMP only has 3 Gain knobs (1 of them is for the sub channel), a LP filter knob, 2 HP Filter switches, a bass boost switch and a LP Filter knob. The Alpine CDA-7894 radio has cross over settings in the menu. Here They Are: Bass Center Frequency (Selectable) : 60Hz, 70Hz, 80Hz, 90Hz, 100Hz, 130Hz, 150Hz, 180Hz Bass Level Control Range : ±14dB at 60Hz (2dB steps) Bass Width Adjustment (Q) : 4 Choices (1= Wide, 4=Narrow) Crossover Type : Independent HP/LP (2-Way) Analog High Pass Crossover Frequency (Selectable) : Off, 80Hz, 120Hz, 160Hz Low Pass Crossover Frequency (Selectable) : Off, 80Hz, 120Hz, 160Hz Treble Center Frequency (Selectable) : 10.0kHz, 12.5kHz, 15.0kHz, 17.5kHz Treble Level Control Range : ±14dB at 10.0kHz (2dB Steps) Here is a question. My Cerwin Vega Components and plates have fixed cross overs on them! Will these defeat my radio cross over controls? Will they be butting heads? Do I select the HP filters to "On"? Here is my amp specs. • Max Power (EIAJ) 75W x 4 + 180W (4ohm; Stereo) 180W x 2 + 180W x 1 (Bridged 4ohm;) • 14.4V RMS Continuous Power 4ohm; Stereo (0.08% THD) 40W x 4 + (0.3% THD)120W x 1(4ohm;) 2ohm; Stereo (0.3% THD) 50W x 4 + (0.3% THD)120W x 1(4ohm;) Bridged 4ohm; (0.3% THD) 100W x 2 + 120W x 1 • S/N Ratio 100 dBA • Bass Engine© • Bass Boost • 18dB LP (50-200Hz) & 18dB HP (80Hz) Crossover • 18dB LP (50-200Hz) & HP (80Hz) Crossovers • 4 Volt Input Capability • STAR Topology & Duo-B Circuitry • Darlington Bi-Polar Outputs • MOSFET Power Supply Please suggest where you would start at. I told you guys I was a newbee. I am pulling my hair out trying to keep figure out how to get the best of what I have. I do know that one needs to set the gains first. Turn them down, the radio up, increase the gain untill there is minimal distrition, then take the gain down until it smooths out? Talk to me Cuzz! 2therock [/QUOTE]
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