Hooking up 2 SVS subs?

[gilahifi]

Hi bros

 

I read from the manual that a y split can be used to feed 2 subs by buying 2 long sub cables.  I was wondering what is the technical difference if we use the "Low Level Line Out" from the 1st sub to feed into the "Low Level Line In" on the 2nd sub.  Or should I only use the y split as stated in the manual by buying 1 long sub cable and 1 short one (since both subs are located in the same spot).  Thanks for clarification.

 

 

[Jag]

Use the splitter instead. This way, both subs get truly the same signal at the same time.

 

Using the Low line level out will be slightly delayed and may not getting what u expected to get.

[gilahifi]

Thanks Jag the guru.  Ok, will use the splitter as recommended.  I was splitting hairs trying to decide how best to do it.

 

Are there any online step by step guide to calibrating 2 subs? or would anyone like to share? 

 

I would like to know the recommended way instead of me just "tikam tikam".  Oh boy..I know I am a very long way behind before being able to figure out how to use my recently purchased DSP1124.

 

Thanks for any advice. 

 

[Jag]

There are a few ways to skin the cat. But lets start it easy and the most common way.

 

If both subs are to be co-located, the best way is to take them as thou they are one big sub. Calilbrate them and tune your BFD as how you would do for 1 sub.

 

 

[hnx676]

There are a few ways to skin the cat. But lets start it easy and the most common way.

 

If both subs are to be co-located, the best way is to take them as thou they are one big sub. Calilbrate them and tune your BFD as how you would do for 1 sub.

 

 

 

If the 2 subs are off different size and model but co-located?

[Jag]

If both are different, then better to cal separately.

 

Take note not to overload the smaller sub.

[hnx676]

If both are different, then better to cal separately.

 

Take note not to overload the smaller sub.

 

So you mean connect and calibrate only 1 sub at a time? Then wouldn't that give you much more output then ideal when you connect both together? Assuming you only have 1 Sub out and using the y splitter ...

[limestone]

So you mean connect and calibrate only 1 sub at a time? Then wouldn't that give you much more output then ideal when you connect both together? Assuming you only have 1 Sub out and using the y splitter ...

 

the quick and easy way would be to EQ the 2 subs together, treating them like their 1 big sub. But this has the possiblilty of putting more stress on the weaker sub, depending on your EQ settings.

 

The safer and better (but longer) way is to individually cal the subs, at their chosen locations, and then do a final check on the frequency response of the 2 subs (when both are on), and make neccessary adjustments on the stronger sub (or maybe the weaker sub, depending again on how hard you've driven the 2 individual subs)

 

My 2 cents worth.  ;)

[hnx676]

the quick and easy way would be to EQ the 2 subs together, treating them like their 1 big sub. But this has the possiblilty of putting more stress on the weaker sub, depending on your EQ settings.

 

The safer and better (but longer) way is to individually cal the subs, at their chosen locations, and then do a final check on the frequency response of the 2 subs (when both are on), and make neccessary adjustments on the stronger sub (or maybe the weaker sub, depending again on how hard you've driven the 2 individual subs)

 

My 2 cents worth.  ;)

 

Thanks! This is very closed to what I have been thinking in my mind. I do not have a BFD but my Denon AV amp does room calibration using Audyssey MultEQxt...

[Jag]

When I mean calibrating them separately, I mean BFD'ing them separately So long as we verify the calibration settings at the final stage.......the sub settings will not be too strong because of the verification stage. However, calibrating with a BFD is not the same as calibrating with built-in amp settings. The BFD offers flexiblity that the amp's EQ doesn't.

 

 

With 2 subs, I find that i tend to get better results callibrating them separately using an audio analyser. Then calibrating them together to check for final sound levels.

 

For Hnx676 case, its different from that of gilahifi's case. When using different subs, its better to look for the ideal spot for the 2 subs separately, rather then co-locating them (unless co-location really is the better choice). The aim of dislocating them is to get their max output levels, if and only if the EQ is a s powerful as the BFD's PEQ.

 

 

[hnx676]

When I mean calibrating them separately, I mean BFD'ing them separately So long as we verify the calibration settings at the final stage.......the sub settings will not be too strong because of the verification stage. However, calibrating with a BFD is not the same as calibrating with built-in amp settings. The BFD offers flexiblity that the amp's EQ doesn't.

 

 

With 2 subs, I find that i tend to get better results callibrating them separately using an audio analyser. Then calibrating them together to check for final sound levels.

 

For Hnx676 case, its different from that of gilahifi's case. When using different subs, its better to look for the ideal spot for the 2 subs separately, rather then co-locating them (unless co-location really is the better choice). The aim of dislocating them is to get their max output levels, if and only if the EQ is a s powerful as the BFD's PEQ.

 

 

 

I am wondering what are the flexibility does the BFD has over Audyssey. As far as I know, BFD has multiple outputs connection but it only output the same calibrated signal. It's not that you can individually calibrate the sub with different curve using 1 BFD ... Please enlighten ...

[Jag]

Ideally, EQ-ing for 2 different subs should use a BFD or similar parametric equalizers that have the below-mentioned functions:

 

1. 2 independent equalising channels down to 20hz.

2. Parametric equalizing

3. Bandwidth adjustability to at least 2/60 octave

4. Center frequency adjustablity to 1hz or less intervals.

5. Have 4 or more Equalisers.

 

 

Te beauty of the BFD is that its got all those requirements that make it so popular is that its a 12-band parametric equaliser that satisfies the requirements to properly calibrate 2 different subs. In addition, a BFD have got 10 memory banks to cater for different bass curve preferences. (eg, 1 setting for loud bass for day time, another for night time settings, another for action movies, another for romantic comedies...... the sky's the limit here)

 

I dun own a denon amp, so I'm not sure if the Audyssey can totally replace a BFD. I do know for a fact that with 2x12 PEQs that a BFD offers, it is certainly flexible enough to cater for a wide range. From my understanding of audyssey MEQxt, appears to be able to do some sub equalising, but I do not know if it can totally replace a well BFD calibrated sub.

 

Taking this systematically, I would advise to use the MultEQxt first and realise what it can and can't do. Then see if the BFD can fill in the gaps that MultEq left behind. That would be my suggestions.

[hnx676]

Ideally, EQ-ing for 2 different subs should use a BFD or similar parametric equalizers that have the below-mentioned functions:

 

1. 2 independent equalising channels down to 20hz.

2. Parametric equalizing

3. Bandwidth adjustability to at least 2/60 octave

4. Center frequency adjustablity to 1hz or less intervals.

5. Have 4 or more Equalisers.

 

 

Te beauty of the BFD is that its got all those requirements that make it so popular is that its a 12-band parametric equaliser that satisfies the requirements to properly calibrate 2 different subs. In addition, a BFD have got 10 memory banks to cater for different bass curve preferences. (eg, 1 setting for loud bass for day time, another for night time settings, another for action movies, another for romantic comedies...... the sky's the limit here)

 

I dun own a denon amp, so I'm not sure if the Audyssey can totally replace a BFD. I do know for a fact that with 2x12 PEQs that a BFD offers, it is certainly flexible enough to cater for a wide range. From my understanding of audyssey MEQxt, appears to be able to do some sub equalising, but I do not know if it can totally replace a well BFD calibrated sub.

 

Taking this systematically, I would advise to use the MultEQxt first and realise what it can and can't do. Then see if the BFD can fill in the gaps that MultEq left behind. That would be my suggestions.

 

Thanks for the detail explanation.... Guess I will give Audyssey a try first then see if I need BFD... The Audyssey setting does make some difference in my current sub, but not sure if it's sufficient by itself.

[Jason Yeo]

Hi bros

 

I read from the manual that a y split can be used to feed 2 subs by buying 2 long sub cables.  I was wondering what is the technical difference if we use the "Low Level Line Out" from the 1st sub to feed into the "Low Level Line In" on the 2nd sub.  Or should I only use the y split as stated in the manual by buying 1 long sub cable and 1 short one (since both subs are located in the same spot).  Thanks for clarification.

 

 

 

Using the low level line out will not get all the freqs .

 

For eg , receiver/pre set cross at 80hz , 1st connecting sub cross at 40hz , low level line out to 2nd sub with cross at bypass or higher than 80hz, you will get 1st sub response around 50hz and below and 2nd sub around 32hz and above depend on roll off and cut off. It is good to use it if 2nd sub cannot go deep or not that good and also if you like the upper freq  of 2nd sub .

 

It is also good when you cannot get what you want on all freq with only a specific phase on a sub .(I am experiment on it now  ;D)

 

But colocated and y splitter is still the easiest way . However , the disadvantage is if you get double power on deep , also double the ringing .

[Jason Yeo]

The safer and better (but longer) way is to individually cal the subs, at their chosen locations, and then do a final check on the frequency response of the 2 subs (when both are on), and make neccessary adjustments on the stronger sub (or maybe the weaker sub, depending again on how hard you've driven the 2 individual subs)

 

My 2 cents worth.  ;)

 

This can hardly work the best  ;)

[Jason Yeo]

If the 2 subs are off different size and model but co-located?

 

If 2 different subs/model better not depend totally on SPL meter liao . You can get superb good response but wrong feel especially on the deeper frequency .