Hi there,

I have recently picked up a pair of MARANTZ HD880 speakers. They are currently getting refoamed, but otherwise decent shape (were my Dad's originally).

These are the specs I can find on them.
Marantz Model HD880
Image Attribution: 1978 Marantz Brochure
Date: March 10th, 2000
General
Description High Definition Speaker System
Rarity X-Rare
Wood Case Walnut wood veneer
Physical
Width 16
Height 40 1/4
Depth 12
Weight 61 lbs
Speaker
Super-Tweeter Drivers 1, 1 inch LPF dome
Tweeter Drivers 1, 1 1/2 inch wide dipersion LPF dome
Midrange Drivers 1, 5 inch
Woofer Drivers 1, 12 inch
Power Handling Capacity 250 watts integrated program material
Frequency Response 30 Hz to 22 KHz +/- 3 dB
Super-Tweeter Controls Yes
Tweeter Controls Yes
Midrange Controls Yes
Grille Cloth
Sound Pressure Level (SPL) for 1 Watt input at 1 Meter at 1k Hz 90dB
Impedance 8 Ohms
Midrange Crossover 750 Hz
Tweeter Crossover 2.3 KHz
Super Tweeter Crossover 5 KHz

Here is my question.

How grossly underpowered will they be if I stick with my JVC 290 Watt amp? (RX-6000vbk)?

What should I be powering them with?

Thx.