bam_saker287
New member
I heard somewhere that 40k ohms for a power amp is needed for tube preamps. I plan on using the morplay with a parasound halo a23+, which has an input impedance of 33k ohms. Would this suffice the morplay? thanks
Is a power amp with a impedance of 33k ohms high enough for the morplay?
- Thread starter bam_saker287
- Start date
33K is about the lowest I'd want to go with a Moreplay. 4K is about as low as I'd want to go with a fully upgraded BeePre, and 300 ohms is about as low as I'd want to go using a Mainline as a preamp.
bam_saker287
New member
so is 33k good? thats a 10:1 ratio at the morplays maximum impedance. i've heard that is doesnt go above 1k ohms when the volume knob is at 12:00 or below, which is where i would have it almost all of the time. so its a 33:1 ratio. i think thats plenty, no?
Yes, we have been dutifully coached over the years by PJ to plan for the worst case scenario when recommending things so issues like these will be very unlikely.
bam_saker287
New member
not sure who pj is but i will assume im good to pair morplay with a23+. google says impedance shouldnt be an issue at all with the 2. also, whats most important, is that the parasound power amp has gain knobs (one for each channel) on the back. there should be zero issue attenuating volumes relative to the impedance and having it high enough so the tubes shine through the best, around >1:00 on the volume dial, keeping the impedance just over 1k ohms on the moreplay. even at 3,2k ohms, google said the math shows it wouldnt even present audible issues of any sort, just it looks a bit worse on paper.
Last edited:
Yes, that is all about right. I think you can leave the trim pots up all the way with the current preamps we offer. These designs have been tweaked to allow much better functionality with solid state amplifiers and systems that have high sensitivity overall (high gain and/or very high speaker sensitivity), so the trim pots on your amplifier end up serving a redundant purpose relative to what's already in the preamp.
bam_saker287
New member
sounds good. thanks for your time paul
