Tape Out as Subwoofer Output?

My integrated does not have a dedicated subwoofer output, however does have L/R "tape outs".

So I used "tape out" on integrated as a subwoofer connection...is there any performance loss??...so far seems to blend well after playing around with the subwoofer's cross over.

Any help would be appreciated.
A true "tape out" on a receiver or preamp is a fixed line level output that is not connected to the volume control. So, as you turn your volume up and down on your main speakers, the tape out volume remains set at full output. You could adjust the volume on the bass amp (if so equipped) but that doesn't seem real practical. You'd have two separate controls to adjust and try to match every time you changed loudness.
Tape out is a fixed output...your integrated amp does not control that output...correct?

You will have no way to control volume on the sub...won't work.

Won't work properly. Changing volume on your main speakers will not adjust the subwoofer when connected via tape out. Certainly not the ideal arrangement.
thanks guys, your're so right...forgot about the fixed volume output, I guess I can use "high level" inputs.
Consider also, that on a good sub, using the high-level inputs has the advantage of imparting some of your amp's voice into the low end, helping it to blend better with what's coming out of your main speakers.
Could one of you please explain what it means to connect the subwoofer via "high level" inputs.

Thank you.
"Could one of you please explain what it means to connect the subwoofer via "high level" inputs."

Connecting with speaker cables.
As Narrod said, if your subwoofer has 'high-level' inputs in addition to the 'line-level' inputs you can run a second pair of speaker cables from the speaker terminals on your amp to the high-level inputs on your subwoofer.

That can be done either by running cables from the 'B' speaker outputs on the amp if you have them, or by running two sets of speaker cables from a single set of speaker terminals, one set to your main speakers and one to the subwoofer. If the second option is all that's available to you, attach the second set of speaker cables either by using banana connectors into the ends of five-way terminals or by doubling up the spade or bare wire connections, or a combination of any of those.

The second set of speaker cables can be a smaller gauge than your main cables, it's just carrying frequency and amplitude information that the subwoofer amp will work with.
Thank you kindly for the clear explanation. I had meditated that move previously but imagined Chinese fireworks demolishing my listening room.
Hey guys, I thought I would add something here.

I have a 1959 vintage Sherwood S-5000 el84 stereo based tube integrated amplifier.

It has tape out,called tape record.

Well, it is a variable out put and I'm running my M&K off it.
So, some older tube amps have variable out with the tape out..
I used to have a Rogue 99Magnum preamp and would occasionally run a sub off the tape loop. I have also run a sub on a different amp system using the high-level method described above. Both techniques worked fine.
If you're not constantly turning the volume up and down with wide swings use the tape out and set the volume on the sub to the normal levels you listen at , by using the high level speaker inputs you negate the crossover built into the sub....I get awesome results this way simply because I don't constantly vary the levels I listen at. If the sub volume ever becomes an issue I get up off my butt and adjust it rarely do I do this. Having a sub integrating with decent bookshelf's sound full and rich at medium and low volume. When a deep blast appears in a soundtrack or video it shows up .....