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Want good strong 12v amp to drive 8 ohm speakers
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<blockquote data-quote="bugman" data-source="post: 8709692" data-attributes="member: 680372"><p>OK, this setup may be a little weird, but I'm waist deep into it and don't really want to start over completely, so hoping someone can help me out with some good advice.</p><p></p><p>This is on a houseboat.</p><p></p><p>I have a basic car stereo (fairly new JBL), a pretty old Xtant 404 amp (50 watts x 4), hooked to four speakers which I *THINK* are good speakers (<a href="https://www.definitivetechnology.com/products/aw6500" target="_blank">Definitive Technology AW6500's</a>),. </p><p></p><p>They actually do sound quite good, just not nearly enough POWER!</p><p></p><p>The speakers are fairly new, I bought them b/c they are outdoor speakers (yes, sometimes it rains at the lake!), I have a little over $1,000 in these 4 speakers, so I really don't want to start over with new speakers if I can avoid it!!</p><p></p><p>So the specs on the Def Tech speakers (per the owner's manual):</p><ul> <li data-xf-list-type="ul">nominal impedance 4 - 8 ohms (I didn't know what impedance was when I bought them (and barely know now!)) :-O</li> <li data-xf-list-type="ul">peak power 200 watts (manual says "Rec. Assoc. Amplification 10 - 200 watts")</li> </ul><p>The JBL radio on the boat is of course 12 volts, as is the existing Xtant amp. There are 4 "basic" speakers inside the boat, I plan to keep the existing Xtant amp to power those 4 speakers inside, and get a NEW amp to power just the 4 Def Tech 6500's that are mounted on the OUTSIDE of the boat (2 on the front, 2 on the back) which are the ones I'll want to CRANK.</p><p></p><p>As I've learned a little about all this, I see that the 8 ohm speakers are a little problem since car amps are designed for 4 ohm speakers (right?).</p><p></p><p>SO... I called Crutchfield, they guy suggested a Rockford Fosgate Power T1000-4AD amp, which is 250 watts RMS x 4 at <strong>1 to 4 ohms. </strong></p><p></p><p>When you double the ohm load the watts are halved, right? So if the amp says 250 watts at <strong>4 ohms</strong>, my 8 ohm speakers would only pull about 125 watts per channel, is that correct? </p><p></p><p>If I hook these 8 ohm Def Techs (which are rated only 200w peak) to it, does that sound like a good setup??? Looks like to me it should be SAFE at least (amp says <strong>250 watts</strong>, but speakers should not pull over the 200 watts peak rating since they are <strong>8 ohms</strong>, right?)... but I almost think that isn't enough power. If I'm going to do this, I want to do it right the first time, and be ROCKIN' at the lake! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>Could I throw MORE power at the Def Tech speakers?</p><p></p><p>Also, I have read a bit about the Class D amps, and several friends who are into this much more than me have said class D is the way to go... this Rockford Fosgate amp is the new technology Class A<strong>D</strong> (NOT A<strong>B</strong>)... so, is it all that? Is this a good amp?</p><p></p><p><strong>The ultimate goal here is to feed as much power to these Def Tech AW6500 speakers as they can handle without blowing anything up in the process!</strong></p><p></p><p>Any thoughts or suggestions are greatly appreciated!</p><p>--</p><p>bugman</p></blockquote><p></p>
[QUOTE="bugman, post: 8709692, member: 680372"] OK, this setup may be a little weird, but I'm waist deep into it and don't really want to start over completely, so hoping someone can help me out with some good advice. This is on a houseboat. I have a basic car stereo (fairly new JBL), a pretty old Xtant 404 amp (50 watts x 4), hooked to four speakers which I *THINK* are good speakers ([URL='https://www.definitivetechnology.com/products/aw6500']Definitive Technology AW6500's[/URL]),. They actually do sound quite good, just not nearly enough POWER! The speakers are fairly new, I bought them b/c they are outdoor speakers (yes, sometimes it rains at the lake!), I have a little over $1,000 in these 4 speakers, so I really don't want to start over with new speakers if I can avoid it!! So the specs on the Def Tech speakers (per the owner's manual): [LIST] [*]nominal impedance 4 - 8 ohms (I didn't know what impedance was when I bought them (and barely know now!)) :-O [*]peak power 200 watts (manual says "Rec. Assoc. Amplification 10 - 200 watts") [/LIST] The JBL radio on the boat is of course 12 volts, as is the existing Xtant amp. There are 4 "basic" speakers inside the boat, I plan to keep the existing Xtant amp to power those 4 speakers inside, and get a NEW amp to power just the 4 Def Tech 6500's that are mounted on the OUTSIDE of the boat (2 on the front, 2 on the back) which are the ones I'll want to CRANK. As I've learned a little about all this, I see that the 8 ohm speakers are a little problem since car amps are designed for 4 ohm speakers (right?). SO... I called Crutchfield, they guy suggested a Rockford Fosgate Power T1000-4AD amp, which is 250 watts RMS x 4 at [B]1 to 4 ohms. [/B] When you double the ohm load the watts are halved, right? So if the amp says 250 watts at [B]4 ohms[/B], my 8 ohm speakers would only pull about 125 watts per channel, is that correct? If I hook these 8 ohm Def Techs (which are rated only 200w peak) to it, does that sound like a good setup??? Looks like to me it should be SAFE at least (amp says [B]250 watts[/B], but speakers should not pull over the 200 watts peak rating since they are [B]8 ohms[/B], right?)... but I almost think that isn't enough power. If I'm going to do this, I want to do it right the first time, and be ROCKIN' at the lake! :-) Could I throw MORE power at the Def Tech speakers? Also, I have read a bit about the Class D amps, and several friends who are into this much more than me have said class D is the way to go... this Rockford Fosgate amp is the new technology Class A[B]D[/B] (NOT A[B]B[/B])... so, is it all that? Is this a good amp? [B]The ultimate goal here is to feed as much power to these Def Tech AW6500 speakers as they can handle without blowing anything up in the process![/B] Any thoughts or suggestions are greatly appreciated! -- bugman [/QUOTE]
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