Question about Technics SA-AX710

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Subwoofer: Active or non active?

I am told all channels on this amp are rated 100 W output, but do i need to run an active subwoofer or will a non powered sub be ok?

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Re: Subwoofer: Active or non active?

Hello Smegboy,

Yes, you are right. This receiver is rated at 100WRMS output in all 5 channels (2-front, 1-center and 2-surround) while in Dolby Pro Logic operation. The subwoofer output is line level only (not amplified), which means you need a powered subwoofer to be connected to this output. A non-powered subwoofer could be used but, you need an additional amplifier connected to the subwwofer output from the receiver to drive it.
Let me know if this helps.


Posted on Dec 29, 2007

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The Jensen JS650 does not accept line level input so you need to use the Front B speaker output from your Sony receiver and not the RCA subwoofer output. Even though your subwoofer is active, it does not support line level (RCA) signals.

Just connect the subwoofer as you would a pair of speakers. Once connected, you make sure the front panel speaker switch on the Sony is set to A+B so you get sound from your existing speakers (A) and subwoofer (B).

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I have the sony str-de1075 reciever.i want to hook up a sub-woofer.but it only has 2 single port.not your reg.rca ports.what do i do..thanks..

Sorry but it's not clear enough what kind of subwoofer (passive or active) you want to use. The passive one has no power supply connection, the active one has a power supply connector and the audio connector can be connected at the "audio out" for the subwoofer, at the rear panel of your STR-DE1075. Take a look at this photo:
In case you need a user manual for your receiver, here is an official link.

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How do i connect a subwoofer to my stero technics su-800mk2 amplifier

You would connect any non-specific subwoofer according to its needs:

passive = to an amplifier channel;

active (self-powered) = per its manual and the capabilities of the source.

Given the lack of a specific subwoofer facility on the SU-800, you need a sub that can be driven by full-range speaker level output. Its manual would describe the procedure. Keeping in mind that most active subs are pretty much the same speaker-level-connection-wise (if they allow it), you could find just about any manual and wit would get you running.

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Htddw7600, brand new, sub amp is not working, only way to get any bass sound is to unplug the sub cable from back of main amp and touch it on side of sub out port.

You have a very good of the best of SONY..SUB does not get activated automatically especially on STEREO mode.DIRECT STEREO Notes • No sound will be output from the subwoofer.
.your system has Dedicated Power Amplifier for 2 Externally Driven Sub-Woofers (200W RMS x 2) order to activate the sub woofer amplifier you need to make a selection on the surround modes while you are switching the modes of the surround you will see the speaker position on the display of receiver as well..if you do not see the sub woofer it wont be activated..Sound Field Program (A.F.D) is a good example to test it..
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Hope this helps!

Additionally please follow the instruction on your user manual to activate the SUB ,as is follows..

Low-frequency (bass) signals can be directed to the
subwoofer and/or the front left and right speakers
according to the characteristics of your system. This
setting also determines the routing of the LFE (low-
frequency effect) signals found in Dolby Digital or DTS
Choices: SWFR (subwoofer), FRONT, BOTH
• Select SWFR if you connect a subwoofer. LFE and
low-frequency signals from other channels are directed
to the subwoofer according to the speaker settings.
• Select FRONT if you do not use a subwoofer. LFE and
low-frequency signals from other channels are directed
to the front speakers according to the speaker settings
(even if you have previously set the front speakers to
• Select BOTH if you connect a subwoofer and you want
to output low-frequency signals from front channels to
both the front speakers and subwoofer. LFE and low-
frequency signals from other channels are also directed
to the subwoofer according to the speaker settings. Use
this function to reinforce low-frequency signals using
the subwoofer when playing back sources such as CDs.

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This manual discusses it somewhat.

Basically, feed the self-powered (active) subwoofer from the Subwoofer Out. There does not seem to be a way to adjust the subwoofer output to match the rest of the speakers because the sub out is muted during the adjustment procedure.

Another way would be to refer to page 15. The note at the bottom right suggests your subwoofer might accept full range speaker level inputs. Refer to the manual for your sub. I believe they mis-printed it and meant "active" subwoofer, as simply wiring a passive (unpowered) sub across the front speaker outputs might cause some amplifier overload issues and you would have no way of balancing it anyway.

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Usually you will looking for a pir of rca/phonos marked mono sub pre out out or something that indicates a line level signal output, check the manual for your amp.

Do not connect an active speaker to a high level amp output as this will damage the equipment.

Hope this helps
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