Soundstream SPL Sub

[skoty]

I just got given a dual voicecoil 10" sub in a sealed box with an unknown amp. Problem being the amp is fukt so have to go out and purchase a new one and don't have specifications on the wattage of the sub. All it says is 8/2 ohms on the back. Any recommedations on what I should do in regards to buying the right amp? Also is it best to run the dual voicecoils in series or parallel off the one channel? And does it make a noticeable difference fitting the sub into a smaller box as I have limited space in my boot? I'm not after anything too serious from the sub as I listen to rock.

[DeeCee]

do you have a model number on the sub?
Or picture to identify?

[skoty]

do you have a model number on the sub?
Or picture to identify?

Yeah tried finding the model on the net via the model number but didn't find any results.

[DeeCee]

I have various programmes with sub specs. If you can provide the model number, I can normally find specs.

[scotty_ish]

I just got given a dual voicecoil 10" sub in a sealed box with an unknown amp. Problem being the amp is fukt so have to go out and purchase a new one and don't have specifications on the wattage of the sub. All it says is 8/2 ohms on the back. Any recommedations on what I should do in regards to buying the right amp? Also is it best to run the dual voicecoils in series or parallel off the one channel? And does it make a noticeable difference fitting the sub into a smaller box as I have limited space in my boot? I'm not after anything too serious from the sub as I listen to rock.

Going by the fact it says 8/2 ohm it must be dual 4 ohm voice coils (in series for 8ohm, parallel for 2). You will want to run it in parallel to make the most power from your amp.
In regards to what amp, I would be looking at getting a mono amp so you can run the voice coils in parallel to the one channel at 2 ohms. Your other option is to get a powerful 2 channel and run one coil off each channel.
For boxes, smaller boxes tend to produce tighter bass, but can also "choke" the sub.
Like DeeCee said, if you can find the model number then its alot easier to make these decisions

[skoty]

I just got given a dual voicecoil 10" sub in a sealed box with an unknown amp. Problem being the amp is fukt so have to go out and purchase a new one and don't have specifications on the wattage of the sub. All it says is 8/2 ohms on the back. Any recommedations on what I should do in regards to buying the right amp? Also is it best to run the dual voicecoils in series or parallel off the one channel? And does it make a noticeable difference fitting the sub into a smaller box as I have limited space in my boot? I'm not after anything too serious from the sub as I listen to rock.

Going by the fact it says 8/2 ohm it must be dual 4 ohm voice coils (in series for 8ohm, parallel for 2). You will want to run it in parallel to make the most power from your amp.
In regards to what amp, I would be looking at getting a mono amp so you can run the voice coils in parallel to the one channel at 2 ohms. Your other option is to get a powerful 2 channel and run one coil off each channel.
For boxes, smaller boxes tend to produce tighter bass, but can also "choke" the sub.
Like DeeCee said, if you can find the model number then its alot easier to make these decisions

Can't I do the same with a stereo amp run in parallel off one channel? I'm sure its a low wattage amp like 90w but not entirely sure.

[DeeCee]

Can't I do the same with a stereo amp run in parallel off one channel? I'm sure its a low wattage amp like 90w but not entirely sure.

sure, if you want your amp to die.
Underpowering the sub will put a lot of pressure on the amp.
Also if you run parallel onto an amp that isn't rated for 2ohm, you run the risk of killing something unless you know what your tolerances are.

If it is 4ohm DVC, then you can run at 2ohm bridged on an amp, or run 4ohm per channel, of course with gain matching.

[deaf_rattle]

how is underpowering a sub any different to having the volume turned down?

[Lloyd]

Because the amp is working at full power, and since you don't hear bass distortion all that well chances are the gains are going to be going over full power which is both bad for the sub and and for the amp.

[scotty_ish]

Yeah by not using enough power its likely that the gains will be set "on full" which will result in the amp clipping and then pop bang and crackle, stuff will start to die.
Its all about giving the sub a nice clean signal

[skoty]

Can't I do the same with a stereo amp run in parallel off one channel? I'm sure its a low wattage amp like 90w but not entirely sure.

sure, if you want your amp to die.
Underpowering the sub will put a lot of pressure on the amp.
Also if you run parallel onto an amp that isn't rated for 2ohm, you run the risk of killing something unless you know what your tolerances are.

If it is 4ohm DVC, then you can run at 2ohm bridged on an amp, or run 4ohm per channel, of course with gain matching.

The guy at parallel imported said it was fine to run both voice coils off one channel So if I'm just going to amplify the sub only best just to get a 2 channel amp and run both voice coils off the 2 different channels. So basically you cant under or over power the sub, the wattage must be exactly the same? Sorry not very knowledgeable with car audio

[DeeCee]

If you provide the model number of the amp, then I can tell you if it can be run off one channel or not, at least provide the specs and/or if the amp is bridgeable to 2 ohm or not.

Model number on the sub would be helpful as well.

I'm emphasising providing as much info as possible so that myself and others can help you setup your system correctly without damaging your equipment.

PI are not the most knowledgeable people in the world, so saying that running a DVC sub on 1 channel of a 2 channel amp would probably put more stress on the amp than is necessary, especially if the amp is not rated for 2 ohm operation on 1 channel.

Running one voicecoil per channel is fine, as long as the gains for the channels are set to exactly the same. (please note, this is not all the way to maximum - safe is half to 2/3rds if required)

[skoty]

As already stated all the sub says is 8/2 ohms, no other specs. I really need someone to see if they can identify the sub so heres an image if that helps...



Its got a serial number which is P1002343, I guess the sub is pretty much useless if I can't find all the specs for it as I wont be able to get a suitable amp for it.

[skoty]

Oh yeah the amp thats broken has no information on it appart from being a soundstream, no model no. or anything. It was a 3 channel however with one mono channel

[skoty]

Ok found on the net its a 350W RMS with a peak power of 700W. Can someone recomend an average affordable amp

[deaf_rattle]

Because the amp is working at full power, and since you don't hear bass distortion all that well chances are the gains are going to be going over full power which is both bad for the sub and and for the amp.

yeah that makes sence.

ive just always thought that when people mention under powering a sub i think they are talking about giving 50watts to a sub that is say rated to 200watts.

[Lloyd]

Ok found on the net its a 350W RMS with a peak power of 700W. Can someone recomend an average affordable amp

viewtopic.php?t=67488

[DeeCee]

The sub is a 2ohm dual voice coil so you either have to run it at 1 ohm in parallel or 4 ohm in series.

If you are going to use a low power amp, run in series at 4 ohm.
If you are going to use a high power monoblock amp, run in parallel at 1 ohm.

Its better suited towards ported boxes based on the thiele small specs.
After some quick box modelling, a good box would be a 1.5 cu ft enclosure tuned to 45hz. Its pretty linear on the extended frequency response curve from 50hz to 100hz.