Dared MP-7 Output Impedence and 15 ohms' speakers

OK, apparently I can - but when parallel wiring to reduce 16ohms speakers to 8, will doing it twice so to speak (as there is a positive and negative cable coming from each amp tap) thus 4 in total mean the final impedence will in fact be 4 ohms as opposed to 8?
The only parallel speaker wiring diagrams I've seen show two wires one pos and one neg.

One tube amp two speakers both 16 0hms but the amp only has a 4 and a 8 ohm tap; I dont want to lose the power from the amp so thogoght parallel wiring would work to reduce the impedence of the speakers from 16 to 8 ohms.

But the configuration will always be two speaker cables coming from the amp to the speakers each of course having two wires; thus will the positive to positive parallel crossover connection from speaker to speaker have to be done twice? All diagrams I've seen only have two single wires.

Cheers Joe, I never allowed for the bi-wire factor.

Jeffrey, it is a DARED MP-7 Stereo tube amp - a SET. (2 times 6 watts). They are advertised on this site with full specification.

In retrospect, I should have entitled the thread: "How do I make parallel connections to a pair of speakers from a stereo tube amp".

I have a "pair" of stereo speakers both of which have 15 ohms (16 for this purpose)impedence. As my amp taps are 4 and 8 respectively, I'll use the 8 ohm tap. Thus my goal is to reduce the impedence of the speakers from 16 to 8 ohms.

I intend to run these in parallel to reduce impedence to 8 ohms to get full "bandwidth" so to speak, best use of the amplifier's available power rather than it running out of gas after the first watt or so. Or not being able to drive the speakers efficiently if you prefer.

I have no idea however what the sensitivity of the speaker's are: being c.1960, I guesstimate they have relatively high sensitivity of 90 to 92 dB as they were (again I'm guessing) made for the then available 20 and 30 watt tube amps.

The conclusion I am trying to arrive at - is in fact very direct - thus: 'because it is a pair of speakers and a stereo amp do I therefore wire them as per any amount of parallel diagrams suggest one does on the internet, but do so - as it were - doubling up the cabling. ie two speaker to speaker connections adjoined? As opposed to the two single speaker wire connection with one adjoining cable between speakers which I adduce is merely a mono[?] set up?

I think by Joe's answer it must be yes; however the concept of biwirng the speakers to the amp - in parallel - is not something I understand and confuses me again yet further.

Perhaps Joe you could explain how I might do this. Or if anyone has a diagram even better.

Thanks for your time, I appreciate your assistance

As an addendum...

Does merely biwiring two stereo speakers result in halving the impedence - 16 to 8ohms?

Can biwirng be achieved if each speaker only has two binding posts -/+ ?

thanks

Thanks