[Sam Kapasi]

It isn't called a pre-amped tube, it's called a powered bass tube. That model has been pulled out for various reasons. As of now JBL has no powered bass tubes or boxes.

That tube you have posted is very popular. You will need an amplifier to drive it, but it should be fun and good VFM.

[firingonallfour]

Originally Posted by Sam Kapasi

It isn't called a pre-amped tube, it's called a powered bass tube. That model has been pulled out for various reasons. As of now JBL has no powered bass tubes or boxes.

That tube you have posted is very popular. You will need an amplifier to drive it, but it should be fun and good VFM.

Hi Sam

I looked hard for the preamped base tube but I couldnt find it. I think a regular Bass tube is the way to go. Any idea what VFM amplifier I should mate this with ? a 2 channel or 4 channel or is there a specific amp for subs /tubes

Any shop in mumbai that is confirmed to keep orginals ? There are two mentioned in the thread I am planning to approach

Thank you

[panky12345]

Yup, you can go in for 2 options:

1. 4 channel for speakers (75.4/CS60.4) + mono (301.1) for tube

2. 4 channel for speakers ( 75.4/CS60.4)+ 2 channel bridged (CS60.2)for tube

[beanstalk_230]

would cs 60.4 with the sub produce better sound (only the connected to sub and no comp) or a single cs 60.2 connected to the sub produce better sound ??

[akg7091]

Personally, I don't like the CS series from jbl. However, if you have to choose an amp only for the sub I would say go for the cs60.2 as it is a two channel amplifier so will work out cheaper for you.
Why don't you go in for a mono amplifier if you are going to use it only for the sub ?

[rocksterraghu]

would cs 60.4 with the sub produce better sound (only the connected to sub and no comp) or a single cs 60.2 connected to the sub produce better sound ??

IMO, both would perform the same, unless it is a DVC.

[panky12345]

Originally Posted by beanstalk_230

would cs 60.4 with the sub produce better sound (only the connected to sub and no comp) or a single cs 60.2 connected to the sub produce better sound ??

Relax! Here are some facts:

60.4 is a 4 channel Amp that pumps out app 160 W X 2 in bridged mode @ 4 ohms.

60.2 is a 2 channel amp that pumps app 160 W X 1 in bridged mode @ 4 ohms. (even though fxaudio says its 2 X 160W )

None of the above is 2 ohm stable in bridged mode.

1. Now, if you connect 1 sub SVC (eg Pio 306/307 C) to 60.2 in bridged mode, it would be fine. Alternatively, you can connect 1 2 ohm DVC sub in series to 60.2 to present a 4 ohm load. Total power to the sub in each case would be app 160 W.

2. If you use 60.4 and connect is just to 1 sub, you can safely go in for 1 Sub DVC 4 ohm (eg Pio 306/307 DVC) and power each coil with 2 bridged channels of the amp, pushing app 160 W X 2 (=320 W) to the sub.

If that is too complicated....in simple words, if you connect a sub to 4 channel amp, it would be app twice as loud (provided its DVC - dual voice coil) as compared to a situation when its connected to 2 channel (in this case the sub has to be SVC - single voice coil)

Hope it helps!

[navin]

Originally Posted by panky12345

If that is too complicated....in simple words, if you connect a sub to 4 channel amp, it would be app twice as loud (provided its DVC - dual voice coil) as compared to a situation when its connected to 2 channel (in this case the sub has to be SVC - single voice coil)

panky you are talking about a 3db increase. it wont appear as twice as loud. more like "a tad louder".

[panky12345]

Originally Posted by navin

panky you are talking about a 3db increase. it wont appear as twice as loud. more like "a tad louder".

Agreed Sir! But given a case like this (powering DVC with 2 channels bridged), how much increase in loudness can be perceived. I'm noob with physics and such, cant relate db with RMS and their results.

[firingonallfour]

ok I am officially confused now

But here is what I gather from the thread

1. i would have liked a powered bass tube .. but they dont sell them anymore'
2. I should go for a bass tube plus amp
3. There is a 2 channel amp, a 4 channel amp and a mono amp ( 2 channel being cheaper.. no one said much about a mono amp)
4. So I power the tube with a 2 channel amp or a mono amp( may be a 60.2 or some similar make) leave the four speakers as they are
5. This way I get the thump I need

Right ?

[panky12345]

All you would get is just low notes with virtually no sound....trust me it'll be very very annoying!

[firingonallfour]

Hi Guys I am sorry for the late response I was traveling. Took my car finally to Shreenath Motors, Milan Subway today. I discussed the idea of the subwoofer and tube with him. He opened up my rear speakers and turns out that they are plain janes - just simple paper cone speakers. So he suggested getting good 3 ways speakers in the rear and testing. I got JBL GTO937. The sound quality and bass has increased manifold. I am leaving it the way it is for now. Once I get tired of the base I will upgrade. I have noted your valuable inputs. I will use them when I upgrade. Thanks a lot guys for your help.

[anupmathur]

Originally Posted by navin

panky you are talking about a 3db increase. it wont appear as twice as loud. more like "a tad louder".

Originally Posted by panky12345

I'm noob with physics and such, cant relate db with RMS and their results.

!!!! That's no excuse for erroneous judgements!

[navin]

Originally Posted by panky12345

Agreed Sir! But given a case like this (powering DVC with 2 channels bridged), how much increase in loudness can be perceived. I'm noob with physics and such, cant relate db with RMS and their results.

the max SPL of a sub is dependant on the following:
1. the freq at which the measurements are done (Max SPL at 100hz is usually much higher than the at 50Hz).
2. the Max excursion of the subwoofer. Excursion is usually quoted as either linear one way, linear p-p (usually double of linear one way), max one way and max peak to peak.
3. the power available (do you have enough power to push the sub to max Xmax?)
4. the sub's install and alignment. for example a corner loaded horn will beahve different from an IB which will behave differently from a 3 chambered 6th order band pass, etc...

the number of coils does not make a difference exacpt it it's ablity to extract more current from the amplifier (when the coils are in parallel).

Also assuming the coils are 4 ohms each many car amps will not be happy about a running into a 2 ohm load (DVC bridged sub) when they are bridged (ch amp car amp).