Often I read or hear comments that a subwoofer is not needed with a particular speaker because that speaker has enough bass. Rougly translated it is like a bit of bass given by a regular excellent HIFI speaker makes a subwoofer obsolete.
A subwoofer is kind of a multifunctional speaker in terms of how one can apply it. There are many uses of which the most popular ones are not really the ones to recommend as a reference. Those are for example the use of a sub in a car or home just for the purpose of getting pumping or distorted or explosive bass and almost promoting a sub to being the main speaker as a matter of speaking. A use of which I get the point that people say the thing mentioned.
With this topic I would like to focus on subwoofers for supporting purposes as originally intended and my personal experiences in order to get it right. Which is not difficult.
Why a sub? *
For music reproduction and sound it completes the landscape. The chart below is that of concert instruments.
*Keep in mind that the chart tells something about traditional instruments and that synths and certain sound effects go even deeper.
- Pop music
Produced music should do well on the tiniest of speakers and the biggest. In pop music ground tones of sub frequencies are often rooted by the same note one or even two octaves higher to make it even sound like there is bass on the smallest of speakers or on phone speakers.
Standmounts and Floorstanders
Small bookshelves are the easiest examples of speakers that benefit from a sub. As a better example I would like to take two model speakers that of which people state online that they don't need a sub. A standmount which has a cut off frequency of 49hz and a floorstander of 40hz.
The bass floor of these two go pretty low on their own. Sometimes the lowest frequencies of their limits might also be a bit exaggerated to give the illusion they go deeper than they actually go, but given the chart they just "don't" cover certain frequencies well. Often showing hearable fatigue like a human being trying to go beyond their reach of vocal ability.
How do I get what I need?
- prefer frequency range and settings over brands
Go for quality but when googling or scanning shops look for the kind of sub first and then the brand. Just taking a random sub might mean it is not quite as preferred. For example an older small sub might be well designed to cover a bookshelve speaker but might just go till 30hz. Modern small ones are able to go to 20hz.
- Get a sub that provides 'at least' a cut off frequency option.
This way you can just make the sub extend the spectrum and not overlap. Your regular speakers should do most of the work and your sub only supports when necessary. It will be kind of a lazy sub, but that is what it is and that is fine.
Get the manual of your speaker, search for the cut off frequency and put your sub on this one.
- Avoid using old amps in combination with speaker cable
Use an amp with sub out and tulip cable to unlock all the potential of a modern sub. Literally.
Yes.. It 'is' possible to connect subs to older amps with speaker wire but this way you can most often only use the volume button on the sub and not the other 90% of the controls like the most important ones. I tested this and if this would be my first experience ever with a sub I would have never have used subs again and mine would go to the trash. My test amp probably didnt send out sub frequencies well and my sub sounded like it was pretending to be a normal woofer laying in the way of my own speakers. I think certain older types of subs do slightly better with older amps but by far not as well as the modern ones.
- Make it an extension in volume
The ideal volume is the dial around a quarter to a 20th. A sub should never be more present than the speaker it supports. It should feel as there was nothing more present besides your regular speaker, but with more weight to it.
- Don't go wild on settings,
Settings are fun to play with but some eq settings cut away floor frequencies of the sub. Leave them all to factory default (usually the A setting). Treat settings more as a solution for a certain situation than a preference.
- Phase shifting - leave it alone
May sound interesting to use and go ahead, but it is not meant like that. Only use it when putting a sub 'behind' the spot you are sitting at. Then the reverse polarity shift makes sense as the output sounds straight again.
- Sub size matters, but..
The bigger a regular speaker's cabinet the easier it produces bass. This also applies to a sub. Though there are some nice modern subs of which manufacturers managed to do extremely well trimming them down to smaller sizes and still remain the full spectrum. The smallest B&W sub is what I went for after using a large sub. No visible big box in the living room while there is no trade off in sound. When scaling up to large rooms and real cinema settings power and format become a thing.
"Infrawoofers"
Most subs go down to 20hz. Below that bass becomes something we can sense, but dives into the inaudible. Infrasound is a thing and can make people work on their nerves. Sometimes applied to suspense in movies or sounds some animals produce. In average a regular sub doesn't go infra, but a rotary sub does. However the latter is not really for use at home.
A subwoofer is kind of a multifunctional speaker in terms of how one can apply it. There are many uses of which the most popular ones are not really the ones to recommend as a reference. Those are for example the use of a sub in a car or home just for the purpose of getting pumping or distorted or explosive bass and almost promoting a sub to being the main speaker as a matter of speaking. A use of which I get the point that people say the thing mentioned.
With this topic I would like to focus on subwoofers for supporting purposes as originally intended and my personal experiences in order to get it right. Which is not difficult.
Why a sub? *
For music reproduction and sound it completes the landscape. The chart below is that of concert instruments.
*Keep in mind that the chart tells something about traditional instruments and that synths and certain sound effects go even deeper.
- Pop music
Produced music should do well on the tiniest of speakers and the biggest. In pop music ground tones of sub frequencies are often rooted by the same note one or even two octaves higher to make it even sound like there is bass on the smallest of speakers or on phone speakers.
Standmounts and Floorstanders
Small bookshelves are the easiest examples of speakers that benefit from a sub. As a better example I would like to take two model speakers that of which people state online that they don't need a sub. A standmount which has a cut off frequency of 49hz and a floorstander of 40hz.
The bass floor of these two go pretty low on their own. Sometimes the lowest frequencies of their limits might also be a bit exaggerated to give the illusion they go deeper than they actually go, but given the chart they just "don't" cover certain frequencies well. Often showing hearable fatigue like a human being trying to go beyond their reach of vocal ability.
How do I get what I need?
- prefer frequency range and settings over brands
Go for quality but when googling or scanning shops look for the kind of sub first and then the brand. Just taking a random sub might mean it is not quite as preferred. For example an older small sub might be well designed to cover a bookshelve speaker but might just go till 30hz. Modern small ones are able to go to 20hz.
- Get a sub that provides 'at least' a cut off frequency option.
This way you can just make the sub extend the spectrum and not overlap. Your regular speakers should do most of the work and your sub only supports when necessary. It will be kind of a lazy sub, but that is what it is and that is fine.
Get the manual of your speaker, search for the cut off frequency and put your sub on this one.
- Avoid using old amps in combination with speaker cable
Use an amp with sub out and tulip cable to unlock all the potential of a modern sub. Literally.
Yes.. It 'is' possible to connect subs to older amps with speaker wire but this way you can most often only use the volume button on the sub and not the other 90% of the controls like the most important ones. I tested this and if this would be my first experience ever with a sub I would have never have used subs again and mine would go to the trash. My test amp probably didnt send out sub frequencies well and my sub sounded like it was pretending to be a normal woofer laying in the way of my own speakers. I think certain older types of subs do slightly better with older amps but by far not as well as the modern ones.
- Make it an extension in volume
The ideal volume is the dial around a quarter to a 20th. A sub should never be more present than the speaker it supports. It should feel as there was nothing more present besides your regular speaker, but with more weight to it.
- Don't go wild on settings,
Settings are fun to play with but some eq settings cut away floor frequencies of the sub. Leave them all to factory default (usually the A setting). Treat settings more as a solution for a certain situation than a preference.
- Phase shifting - leave it alone
May sound interesting to use and go ahead, but it is not meant like that. Only use it when putting a sub 'behind' the spot you are sitting at. Then the reverse polarity shift makes sense as the output sounds straight again.
- Sub size matters, but..
The bigger a regular speaker's cabinet the easier it produces bass. This also applies to a sub. Though there are some nice modern subs of which manufacturers managed to do extremely well trimming them down to smaller sizes and still remain the full spectrum. The smallest B&W sub is what I went for after using a large sub. No visible big box in the living room while there is no trade off in sound. When scaling up to large rooms and real cinema settings power and format become a thing.
"Infrawoofers"
Most subs go down to 20hz. Below that bass becomes something we can sense, but dives into the inaudible. Infrasound is a thing and can make people work on their nerves. Sometimes applied to suspense in movies or sounds some animals produce. In average a regular sub doesn't go infra, but a rotary sub does. However the latter is not really for use at home.
Last edited: