Help me understand this

Because JL.

yep that's all... 50% of all jl price is the name... lot of decent amps in class lots cheaper u be better off with sundown.. i forget is your sa d4? list your equipment in sig make it easier..

[quote name='Water Bear']So I've been looking at class D sub amps around the 1k-1.2k watt mark. I've looked at everything from Zed and Zapco to mainstream brands. (BTW Zed has some really great articles on his blog).

So here's the JL Audio HD series (yes I know they are way over priced):

HD 1200 watt amp

The relevant specs:

S/N @ rated power: >110 db
S/N @ 1 watt: > 79 db
Damping Factor @ 4 Ω: >500 / 50 Hz
Damping Factor @ 2 Ω: >250 / 50 Hz
THD+N @ Rated Power: <0.03% @ 4 Ω

And then there's the Alpine MRV-M1200:

MRV 1200 watt amp

The relevant specs:

Signal to Noise (Rated Power into 4 Ohms): >105 dB
Signal to Noise (1W into 4 Ohms): >85 dB
Damping Factor (10W into 4 Ohms at 100Hz): >750

Now the THD is not listed, but it's <1% at rated power, and the limit of human hearing is 1% (or so I've read). Also the JL THD of <0.03% is probably not at rated power anyway. Damping factor for the Alpine will be worse at 50 Hertz but I wouldn't expect it to be dramatically worse.

So please explain to me. Why would I pay $584 more for the JL when the cheap-o Alpine has incredibly similar specs. And don't say balanced inputs, because Stephen Martz says that doesn't matter much in car audio.[/QUOTE]
@LosIsATool
this guy knows more about amps than you do.

[quote name='Papermaker85']@LosIsATool
this guy knows more about amps than you do.[/QUOTE]

Obviously he don’t know regulated power supply’s cost more.
Moron.
And balanced inputs do work if you use twisted pair RCAs.
Mantz has changed his tune many times over the years. And produced a lot of amps that fail/QC issues.

So I've been looking at class D sub amps around the 1k-1.2k watt mark. I've looked at everything from Zed and Zapco to mainstream brands. (BTW Zed has some really great articles on his blog).
So here's the JL Audio HD series (yes I know they are way over priced):

HD 1200 watt amp

The relevant specs:

S/N @ rated power: >110 db

S/N @ 1 watt: > 79 db

Damping Factor @ 4 Ω: >500 / 50 Hz

Damping Factor @ 2 Ω: >250 / 50 Hz

THD+N @ Rated Power:

And then there's the Alpine MRV-M1200:

MRV 1200 watt amp

The relevant specs:

Signal to Noise (Rated Power into 4 Ohms): >105 dB

Signal to Noise (1W into 4 Ohms): >85 dB

Damping Factor (10W into 4 Ohms at 100Hz): >750

Now the THD is not listed, but it's

So please explain to me. Why would I pay $584 more for the JL when the cheap-o Alpine has incredibly similar specs. And don't say balanced inputs, because Stephen Martz says that doesn't matter much in car audio.

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The JL has RIPs. It’s the only thing on the market that will do rated power 1.5-4ohm AND 12v-14v. That’s why it cost more.

RIPs also doesn’t lose power to fast spikes in impeadance rise.

Are they worth the cost? That’s up to you. If I could fit slash amps that’s what I would be using, I loved my old set.

The HDs look funny to me so I don’t like them.

The JL has RIPs. It’s the only thing on the market that will do rated power 1.5-4ohm AND 12v-14v. That’s why it cost more. RIPs also doesn’t lose power to fast spikes in impeadance rise.

Are they worth the cost? That’s up to you. If I could fit slash amps that’s what I would be using, I loved my old set.

The HDs look funny to me so I don’t like them.

Click to expand...

******** is flowing.

you know nothing about the circuit..

there are a ton of quality amps out there in the 1200 watt range for a decent price, the least of which is the SoundQubed 1200

I'm just messin with you, man.

Will do. You are correct, I have a D4 SA-12.

That may be true. Alpine's PDX series will do rated power at 2 and 4 ohm, but I don't know how it varies with voltage.

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The fact is amps with RIPs will destroy another of the same rating.

Sound the same but there is an obvious power difference. I will take 1200 watts of those over 2000 watts of something else.

I'm just messin with you, man.

Will do. You are correct, I have a D4 SA-12.

That may be true. Alpine's PDX series will do rated power at 2 and 4 ohm, but I don't know how it varies with voltage.

Click to expand...

wow that was pretty good., looks like something youdo woulda done u slipping youdo... my thing is tht jl would cost twice what other would i don't see how it's worth it, now to do full power over different ohm loads i think thats cool but not worth say $300 extra if u know what ohm load u gonna run..

I'm just messin with you, man.

Will do. You are correct, I have a D4 SA-12.

That may be true. Alpine's PDX series will do rated power at 2 and 4 ohm, but I don't know how it varies with voltage.

Click to expand...

didn't i tell you he was full of ****? my pg xenon will make that jl look like ****.. 225x4 from 1 ohm to 4 ohm... hes a moron..

oh and it has mosfet swiching supply with linea bipolar outputs that have a ANALOG output. he has no clue what that means though,

didn't i tell you he was full of ****? my pg xenon will make that jl look like ****.. 225x4 from 1 ohm to 4 ohm... hes a moron..

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He’s looking at a mono you ingrate.