Thread Title Removed

Gerbil333

Diamond Member
Jan 28, 2002
3,072
0
76
I bought a set of Logitech Z340's last year since they were only $30 after a rebate and they matched my setup (especially my Logitech Elite and MX500).

The sub has always had poor range and mostly sounded like crap, so tonight I tried to take it apart.

At first, I failed. I finally gave in and drilled holes in the grill to access the screws. The result:

:camera:
:camera:
:camera:
:camera:
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:camera:
:camera:

Note the fake 8" speaker. The actual speaker was only about 4".

I hooked up an Infinity Perfect 6.1 woofer instead:

:camera:
 

Viper GTS

Lifer
Oct 13, 1999
38,107
433
136
Well your pictures don't really show that well, but it appears to me that what you're calling a "fake speaker" is a passive radiator.

Passive radiators serve the same purpose as a port or vent, they are no secret & there's nothing wrong with them.

Viper GTS
 

MikeMike

Lifer
Feb 6, 2000
45,885
66
91
Originally posted by: Viper GTS
Well your pictures don't really show that well, but it appears to me that what you're calling a "fake speaker" is a passive radiator.

Passive radiators serve the same purpose as a port or vent, they are no secret & there's nothing wrong with them.

Viper GTS

thats what it is. i believe. since i see no leads on it to plug it in to a source or anything and the cardboard on the front is just there to add weight it seems.

MIKE
 

Viper GTS

Lifer
Oct 13, 1999
38,107
433
136
Originally posted by: nourdmrolNMT1
Originally posted by: Viper GTS
Well your pictures don't really show that well, but it appears to me that what you're calling a "fake speaker" is a passive radiator.

Passive radiators serve the same purpose as a port or vent, they are no secret & there's nothing wrong with them.

Viper GTS

thats what it is. i believe. since i see no leads on it to plug it in to a source or anything and the cardboard on the front is just there to add weight it seems.

MIKE

Yeah, the more I look the more I'm convinced that's what it is.

OP = Moron

If you're going to bash something make sure you have a clue WTF you're talking about.

Viper GTS
 

MikeMike

Lifer
Feb 6, 2000
45,885
66
91
the pics are hard to pick it out with too becuase all he shows it front back, give a side view.

MIKE
 

JustAnAverageGuy

Diamond Member
Aug 1, 2003
9,057
0
76
Originally posted by: Viper GTS
Well your pictures don't really show that well, but it appears to me that what you're calling a "fake speaker" is a passive radiator.

Passive radiators serve the same purpose as a port or vent, they are no secret & there's nothing wrong with them.

Viper GTS

pwnt

 

Gerbil333

Diamond Member
Jan 28, 2002
3,072
0
76
Originally posted by: Viper GTS
Well your pictures don't really show that well, but it appears to me that what you're calling a "fake speaker" is a passive radiator.

Passive radiators serve the same purpose as a port or vent, they are no secret & there's nothing wrong with them.

Viper GTS

Yes, I was aware of that. However, Logitech failed to mention the size of the sub in any of their documents, and up until now, it looked like an 8" woofer in a sealed enclosure.

I understand what they did, but it's rather decieving.

Yeah, the more I look the more I'm convinced that's what it is.

OP = Moron

If you're going to bash something make sure you have a clue WTF you're talking about.

Viper GTS

I think I just explained it...I know it works, but it's decieving.

if the sound output is what it should be, what does the physical size matter?

That's my point -- the sound output does suck. The sub sounded muddy, had terrible range, and it wasn't very loud.
 

MikeMike

Lifer
Feb 6, 2000
45,885
66
91
Originally posted by: Gerbil333
Originally posted by: Viper GTS
Well your pictures don't really show that well, but it appears to me that what you're calling a "fake speaker" is a passive radiator.

Passive radiators serve the same purpose as a port or vent, they are no secret & there's nothing wrong with them.

Viper GTS

Yes, I was aware of that. However, Logitech failed to mention the size of the sub in any of their documents, and up until now, it looked like an 8" woofer in a sealed enclosure.

I understand what they did, but it's rather decieving.

ive just got the question, there is NOTHING else in that enclosure???

a passive radiator isnt even a speaker, it is a replacement for a port in order to give extra dB output.

if there is nothing else in that enclosure sumthing is fubar.

MIKE
 

Gerbil333

Diamond Member
Jan 28, 2002
3,072
0
76
The enclosure has a wall half way inside the box, with a carboard tube as a port between the two areas. The amp resides in the other side. However, I couldn't get into that side without doing further damage. I can take more pics if you want, but the above pics show everything.
 

desteffy

Golden Member
Jul 16, 2004
1,911
0
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what do you expect for cheap speakers

It didnt actually SAY there was an 8" speaker did it?
 

Goosemaster

Lifer
Apr 10, 2001
48,775
3
81
Originally posted by: Viper GTS
Originally posted by: nourdmrolNMT1
Originally posted by: Viper GTS
Well your pictures don't really show that well, but it appears to me that what you're calling a "fake speaker" is a passive radiator.

Passive radiators serve the same purpose as a port or vent, they are no secret & there's nothing wrong with them.

Viper GTS

thats what it is. i believe. since i see no leads on it to plug it in to a source or anything and the cardboard on the front is just there to add weight it seems.

MIKE

Yeah, the more I look the more I'm convinced that's what it is.

OP = Moron

If you're going to bash something make sure you have a clue WTF you're talking about.

Viper GTS

heh
 

Howard

Lifer
Oct 14, 1999
47,982
11
81
Originally posted by: Gerbil333
The enclosure has a wall half way inside the box, with a carboard tube as a port between the two areas. The amp resides in the other side. However, I couldn't get into that side without doing further damage. I can take more pics if you want, but the above pics show everything.
Sounds like a bandpass box.
 

PoPPeR

Diamond Member
Oct 9, 2002
6,993
0
0
so are you accusing them of false advertising something they didn't even advertise? This is like complaining that a fast looking car is actually slow after you take a look at the engine.
 

Viperoni

Lifer
Jan 4, 2000
11,084
1
71
It is indeed a standard 4th order bandpass box with a passive radiator instead of a port as ViperGTS stated.

It's actually a good thing they used an 8" passive radiator instead of a 4"... you'd really feel ripped off in the latter case.

In fact, passive radiators are much better than ports for super small woofer applications such as this one.

The logitech website claims:
Innovative, dual-chamber subwoofer delivers twice the bass energy of similar subwoofers


BTW: the Z540's sub has an identical setup.
 

So you wasted a speaker from a perfect 6.1 on this? The logitech website says that only 25watts is going to the sub..... Is that whats powering it?
If you are going to complain so much about speakers, why didnt you spend more money on quality ones? WTF do you expect for $30?
 

Gerbil333

Diamond Member
Jan 28, 2002
3,072
0
76
Originally posted by: desteffy
what do you expect for cheap speakers

It didnt actually SAY there was an 8" speaker did it?

Originally posted by: PoPPeR
so are you accusing them of false advertising something they didn't even advertise? This is like complaining that a fast looking car is actually slow after you take a look at the engine.

Originally posted by: brtspears2
$30, were you expecting something good?

Why did I even bother?

You guys are totally missing the point. Yes, the set was $30; no, I did NOT expect anything good--refer to my original post, which states that I bought them because they matched my setup. Of course they're going to suck. I didn't buy them for that though. I use Sennheiser headphones with my Audigy 2 ZS when I want quality. I'm not claiming false advertisement. Maybe my thread title was a stretch. I was surprised to find something other than a cheap 8" woofer when I opened up the sub enclosure, hence the "dirty secret". No, Logitech never claimed that the Z340's to have an 8" sub, but I also reported that in another post.

So you wasted a speaker from a perfect 6.1 on this? The logitech website says that only 25watts is going to the sub..... Is that whats powering it?
If you are going to complain so much about speakers, why didnt you spend more money on quality ones? WTF do you expect for $30?

No, I didn't waste a speaker from a Perfect 6.1 set. The speaker, which is damaged, has been sitting around for about a year. The set belonged to my girlfriend. I didn't have the time to install the speakers, so she had the only local car audio shop install them. The idiots installed the speakers very poorly. We could hear terrible noises at anything beyond about 35% volume. I told her to go back and have them to fix it. They said they didn't know what was wrong.

I ended up fixing it myself. When I opened the door, I found that they hadn't made enough space for the new woofers, so the surrounds were hitting the factory grills in the doors, even at moderate volumes. By that time, though, the speakers had already suffered permanent damage. The surrounds had worn thin (which shouldn't affect sound quality), but the main problem was a popping noise had developed.

She ordered two new woofers from Infinity (not the entire set). No more problems.

I put one of the damaged woofers in her old Altec Lansing 2.1 system that had a blown 6.5" sub. The popping noise sucks, but the system sounds a lot better than it did with a blown woofer.

So, yea, only 25W is powering the other damaged Perfect 6.1 in my Logitech Z340's. The popping is still present with that small amount of power, but it's not nearly as bad as it sounded when the speaker was hooked up to a 4x100W RMS car amp. In conclusion, the damaged speaker is being put to use instead of being trashed. It's difficult to throw away a speaker from a $300 set of components.

The sound quality of my Z340's is still much improved over the Logitech Z340 sub despite the damaged Perfect 6.1 woofer. The SQ is nothing compared to a fully functional Perfect 6.1 woofer though.

Originally posted by: PhasmatisNox
404'd

Fixed.