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Another speaker thread

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Baker7
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Another speaker thread

Post by Baker7 » Thu Mar 17, 2016 7:47 pm

I replaced the rear door speakers on my wagon with 5.5in 4 ohms and the sound was tiny.

I realized I needed 8 ohms, so I got those in 6.5" 2-way midrange woofers moded the plastic panel in the door to fit. Looks real nice, BUT sounds just as tiny as the 4ohm speakers. What is up??

Why does it sound so small like sound coming from a 1 inch speaker? I tried switching positive and negative wires and both sound the same. Like chit.

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Re: Another speaker thread

Post by Baker7 » Thu Mar 17, 2016 7:54 pm

Specs
Power RMS: 75 Watts
Peak Power: 150 Watts
8 Ohm impedance
Frequency response: 125hz - 10khz
Sensitivity: 100dB @ 1w / 1m

Stock front speakers sound like thumping bad ass sound system compared to the weak ass barely audible sad noise coming from the rear.

The thing has huge magnets and it's heavy as hell, yet there's 0 base coming out of it. My fader is nearly at the bottom to get any sound coming from it. Frustrating.

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PeteB

Re: Another speaker thread

Post by PeteB » Thu Mar 17, 2016 8:54 pm

What is the brand and model of the replacement speakers?
Those specs are essentially meaningless by the way.

The originals were 5.5" and you've modified it to fit 6.5"?

I'm into Audio and speaker design and will try to help you.

Crutchfield has been the place to go to find out what fits your car.
I did this search for our car, 96 Volvo 850:
http://www.crutchfield.com/g_400/All-Ca ... tp=105&l=D

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Re: Another speaker thread

Post by Baker7 » Thu Mar 17, 2016 9:26 pm

Cool thanks for reply. They are: Rockville RXM68 6" 300w 8 Ohm Mid-Range Drivers Car Speakers, Mid-Bass. Never heard of them, but then again I haven't shopped for car speakers in well over a decade. Got them on Amazon.

Any idea what the heck is going on? I have a platinum model so came with factory amp. From what I read any 8ohm speakers should be just plug n play. I disconnected the two factory tweeters in the pillar because my wife would cuss and scream from the back seat every time I turned up the volume. That wouldn't have anything to do with door speakers would it?

No, originals factory ones are around 6". I got 5.5" 4 Ohm not knowing I need 8 ohms, so I bought another pair of 6.5" speakers 8 Ohm. They were advertised as 6" but when I got it I just decided to mod the door panels to make them fit.

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Re: Another speaker thread

Post by BEJinFbk » Thu Mar 17, 2016 10:08 pm

It's all about a good, airtight seal between the front side
of the speaker and the back side. If you've mounted the
new ones leaving gaps between the speaker's basket
and the door panel, the moving air from the front of
the woofer cone cancels out the lower frequencies
from the back of the cone.

Short story? Make sure the new speakers seal up
tight into the doors as well as the OEM's did.
'98 V70 R - Well Equipped for Life Up North... ;)

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Re: Another speaker thread

Post by Baker7 » Thu Mar 17, 2016 10:41 pm

Yeah that makes sense..I did leave some holes. I still am a little doubtful that a few holes will create the huge difference in volume btwn fronts and rear, even the treble. We'll see after I seal the holes up. Thanks for the suggestion.

But, that is not the problem. It's power output. There's something wrong. Power output should not be so low compared to the front.

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Re: Another speaker thread

Post by Ozark Lee » Fri Mar 18, 2016 7:30 am

The problem isn't the impedance, that is a load issue and the head unit doesn't really care. The problem is the speaker itself that you chose. What you bought was a mid range driver rather than a full range speaker. It may be a great speaker as a part of a larger system with a separate woofer and tweeter but it, by design, will sound much like you describe it by itself. There is a big impedance mismatch from the factory if you have rear door speakers anyway.

Reading specs on a full range speaker is usually an exercise in futility since they all claim 20hz to 20kHz (the range of human hearing) but the low end and top end may be down 10db and there may be big swings across the spectrum in frequency response. The only real test is with your ears but in general what you are looking for is a "full range" coaxial or even triaxial speaker. The OEMs were a coaxial.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
Previous:
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

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Re: Another speaker thread

Post by PeteB » Fri Mar 18, 2016 9:23 am

Baker7 wrote:Yeah that makes sense..I did leave some holes. I still am a little doubtful that a few holes will create the huge difference in volume btwn fronts and rear, even the treble. We'll see after I seal the holes up. Thanks for the suggestion.

But, that is not the problem. It's power output. There's something wrong. Power output should not be so low compared to the front.
Holes will hurt the bass response, unless they are carefully tuned, but will
not alter the efficiency which is what you are complaining about.

What's wrong, most likely, is that they are a very cheap speaker and are no
where near the efficiency of the original speakers. They might have big
looking magnets but it is probably the lowest grade of material so they are
weak.
On the other hand, higher performance speakers often trade off efficiency
for bass extension, so even if you buy good quality speakers there is a chance
that they will be less efficient.
You really should use the correct impedance unless you know for sure that the
amp can handle lower impedance loads. Odd that they are 8 ohms since auto
speakers are usually 4.

BTW those Rockville RXM68 are a brand I've never heard of and are probably a
low quality brand trying to sound like the highly regarded Rockford Fosgate brand.

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Re: Another speaker thread

Post by Baker7 » Fri Mar 18, 2016 9:45 am

Thanks for the helpful responses. So I bought the wrong speakers, yet again. Dammit. And I mutilated the door panel as well as speaker mounting ring. Full range speakers.. got it. Oh what the hell am I gonna do with all these speakers..

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Re: Another speaker thread

Post by Baker7 » Fri Mar 18, 2016 9:49 am

Lee,
So, does wattage matter much on the stock Volvo sound system? What wattage should I get? I see a full range 8 Ohm speaker on Amazon but it's 10 watts.

EDIT:
Wait I see one for 20 watts! This shopping for speakers for a Volvo is next to impossible. I see a bunch of stock 850 speakers on Ebay for like $50+. They are front door speakers though. Maybe I should just get those and be done with it..

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