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Message Forums Car Stereo Message Forums > Head Units > My take on Alpine 4Volt...
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newfosgatesucks
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 My take on Alpine 4Volt...

As most already know, I am notoriously old-school in my audio fun-time.  I just won't break down and buy anything new, until it DOES what it SAYS at a price that rivals used gear - and nothing against class d, it's just not for me.

 

   Long story short, I replaced an antique Alpine 7903 with a newer 4v ALpine, I didn't want to risk my nr mint 7904 or 7909 copper sleeve getting yanked... So after swapping to 4v, here's my take.

 

     I started by leaving all amplifier gains the same (all 2v max input) and both Nakamichi ec-200 crossovers set at the same level as before.   I popped the New "4V" Alpine in, and gave a quick listen, and guess what?  Nothing changed.   I spent two hours sitting, driving, eating, tweaking in the car, and songs I KNOW through and through had basically no difference - aside from actually not hitting as hard. 

 

    Now this comes as a surprise, thinking that my old Hifonics Thor/Zeus are 2v max input, and the Nakamichi pa-series amps on my hi's are 2v as well.  Seriously, no distortion, no added DB's(which would have indicated I needed to tone down a tad) and to my surprise, the feeling in my head and chest are lessened to barely being felt.

 

   With the 7903 or 7904 in, (Which I hooked back up just as a reference, the 7904) The chest-thumping and head shaking, window-shaking thump was there.  I didn't check with the 7909, It always was eery bit as strong as the 7903/4...\

 

    So what gives?  Is head unit output voltage inflated like amplifier output power is these days?   Do you literally have to ask if pre-outs are RMS or Peak, on a freakin low-volt out!!!

 

   Really, I am NOT surprised - I have set up a few systems with 4v and higher and thought maybe there was some fudging.   A few years back I set up Kenwood hi-volt h/u and never changed the gain on the amp, and chalked it up to the x-over being diff.  

 

     Oh, and one added pain - a touch of ignotion whine from around 2500rpm to around 4000.   Low volume, not increased with volume - which disappeared with the older unit this aft.   Even ran a new chassis to frame wire to no avail.

 

     For the curious, here is the setup -

Hi's - MB Quart 6-1/2 QM series and separate tweets, biamped by a nakamichi pa-350 4ch.

Midbass - 6-1/2 mb quarts with a hifonics thor in stereo 4 ohm.

Subs - 2 Rockfor Fosgate Punch Pro 18's (SPP-188's) with a Hifonics Zeus Bridged mono at 4 ohms. 

Crossovers- (2) Nakamichi ec-200 2-ways

Now shouldn't this be the ULTIMATE test of whether something puts out 4 volts in preamp signal!!!  Not a single component is rated above 2 volts!!!

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New Post 10-16-2011 11:13 PM
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N2Audio
Senior Member

 

why not just get a 0db tone - say 1khz - and measure it at different volume levels?
Using a few different freq's would be even better. Say, 50, 200, 1000, 5000?
That would be a lot more objective.

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New Post 11-10-2011 03:05 PM
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